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Express L128 and Express L128T ISDN Router/Bridge USER MANUAL Express L128, Data Only 1202070L1 Express L128T with POTS Option 1202070L2 61202.070L1-1A May 1998.
Trademark: DMS-100 is a trademark of Northern Telecom, Inc. Ethernet is a trademark of Digital Equipment Corporation, Intel Corporation, and Xe- rox Corporation. ExpertISDN (patent number 5,715,241) is a trademark of ADTRAN, Inc. Macintosh is a registered trademark of Apple Computer, Inc.
FCC regulations require that the following information be provided in this manual: 1. If this equipment causes harm to the telephone network, the telephone company may temporarily discontinue service. If possible, advance notification is given; oth- erwise, notification is given as soon as possible.
CANADIAN EMISSIONS REQUIREMENTS This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the interference-causing equipment standard entitled "Digital Apparatus," ICES-003 of the Department of Communications.
IMPOR T ANT SAFETY INSTR UCTIONS When using your telephone equipment, basic safety precautions should al- ways be followed to reduce the risk of fire, electric shock and injury to persons.
61202.070L1-1 Express L128/L128T User Manual i T able of Contents Quick Startup Guide ......................................................................................................... 1 Setting up the ISDN Line ................................
Table of Contents ii Express L128/L128T User Manual 61202.070L1-1 Chapter 3. Terminal Menu Operation and Structure ................................................. 27 Terminal Menu Structure ...........................................................
Table of Contents 61202.070L1-1 Express L128/L128T User Manual iii IP/Static Routes ................................................................................................... 41 Static Routes/Active ...........................................
Table of Contents iv Express L128/L128T User Manual 61202.070L1-1 Bridge/Spanning Tree......................................................................................... 52 Spanning Tree/Mode .....................................................
Table of Contents 61202.070L1-1 Express L128/L128T User Manual v Connection List/IP .............................................................................................. 67 IP/Mode .............................................................
Table of Contents vi Express L128/L128T User Manual 61202.070L1-1 Connection List/Bandwidth .............................................................................. 77 Bandwidth/On Demand .........................................................
Table of Contents 61202.070L1-1 Express L128/L128T User Manual vii Dial/Dial ...................................................................................................................... . 8 8 Dial/Hang Up ....................................
Table of Contents viii Express L128/L128T User Manual 61202.070L1-1 Upgrade/Status.................................................................................................... 104 Upgrade/Start Transfer .........................................
61202.070L1-1 Express L128/L128T User Manual ix List of Figures Figure 1-1: Express L128/L128T ...................................................................................... 7 Figure 1-2: Single User to Corporate LAN ..........................
List of Figures x Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual xi List of T ables Table 2-A: Using the Flash-Hook ..................................................................................... 23 Table 4-A: Troubleshooting Calls .................................
List of Tables xii Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 1 Quick Startup Guide SETTING UP THE ISDN LINE Before configuring the Express L128/L128T, ensure that the telephone service has provided the switch type, service profile identification (SPID), and local directory number (LDN).
Quick Startup Guide 2 Express L128/L128T User Manual 61202.070L1-1 CONNECTING TO AN INTERNET SERVICE PROVIDER Internet Access using Network Address Translation (NAT) 1. Connect the 10BaseT cable from the PC’s network card to the Express L128/L128T. Select TO NIC on the Express L128/L128T back panel.
Quick Startup Guide 61202.070L1-1 Express L128/L128T User Manual 3 19. If the call is successful, the Status column will read active . If not, make sure the number(s) are correct or reference Chapter 4 on page 107 (the trou- bleshooting chapter) before going on to the next step.
Quick Startup Guide 4 Express L128/L128T User Manual 61202.070L1-1 11. Enter the IP address and Netmask parameters of the access server at the remote site. This creates a static route to the access server’s network which is entered into the Express L128/L128T’s IP route table.
Quick Startup Guide 61202.070L1-1 Express L128/L128T User Manual 5 When the computer which is attached to the local LAN attempts to access a host on the access server, the Express L128/L128T will dial the number pro- vided in the Connection List profile.
Quick Startup Guide 6 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 7 Chapter 1 Understanding ISDN and the Express L128/L128T ISDN OVERVIEW The Integrated Services Digital Network (ISDN) is a public or private switched digital network.
Chapter 1: Understanding ISDN and the Express L128/L128T 8 Express L128/L128T User Manual 61202.070L1-1 Applications Single User to Corporate LAN • Telecommuter/Home Office Access to the corporate LAN • Single device access • User Datagram Protocol (UDP) broadcasts are “relayed” to corporate LAN.
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 9 Single User IP to Internet Service Provider (ISP) using Network Ad- dress Translation (NAT) • Provides high speed home access to the Internet • NAT provides translation from user assigned IP addresses to ISP assigned IP addresses.
Chapter 1: Understanding ISDN and the Express L128/L128T 10 Express L128/L128T User Manual 61202.070L1-1 Multiple Users to Internet Service Provider (ISP) using NAT • Provides high speed home access to the Internet • Multiple and simultaneous access • The PC’s IP address can by dynamically assigned by the Express L128/ L128T.
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 11 Small Office - Home Office (SOHO) to Corporate LAN • Connects the small office or home office.
Chapter 1: Understanding ISDN and the Express L128/L128T 12 Express L128/L128T User Manual 61202.070L1-1 2. IP Router: The Express L128/L128T can function as an IP router using the Routing Information Protocol (RIP) for advertising and learning routes among other routers.
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 13 Bridging In Bridge Mode, the Express L128/L128T can communicate with two remote networks at a time. The destination is dialed by setting up a Connection List profile and choosing Dial on the Dial menu.
Chapter 1: Understanding ISDN and the Express L128/L128T 14 Express L128/L128T User Manual 61202.070L1-1 IP Routing The Express L128/L128T operates as a dial-up IP router when the Configura- tion/IP/IP Router/Mode option is configured to On .
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 15 IPX Routing Like IP routing, the Express L128/L128T can connect to two different sites and exchange IPX packets. Network routes and services are learned and adver- tised using Novell’s RIP and SAP.
Chapter 1: Understanding ISDN and the Express L128/L128T 16 Express L128/L128T User Manual 61202.070L1-1 Network Address Translation Mode NAT is a special mode of operation in which the Express L128/L128T obtains a dynamically assigned IP address from the peer router (typically an Internet Service Provider).
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 17 WAN Indicators PWR Flashes when the link is inactive; solid when the link is active. B1 Flashes green when the link is being negotiated; off when the link is active.
Chapter 1: Understanding ISDN and the Express L128/L128T 18 Express L128/L128T User Manual 61202.070L1-1 ISDN Connection From the network, ISDN is delivered by a single 2-wire 2B1Q U-interface which is connected directly to the Express L128/L128T.
Chapter 1: Understanding ISDN and the Express L128/L128T 61202.070L1-1 Express L128/L128T User Manual 19 Ordering ISDN When ordering ISDN from the telephone company, request EZ-ISDN 1 (Ca- pability Package U) to ensure it is set up properly. EZ-ISDN 1 is recommend- ed by the industry for most home office/small business applications.
Chapter 1: Understanding ISDN and the Express L128/L128T 20 Express L128/L128T User Manual 61202.070L1-1 incoming HTTP, FTP, and mail server requests from the Internet to be trans- lated and forwarded to this address on the user network. Configuration The Express L128/L128T is configured using a menu-based interface.
61202.070L1-1 Express L128/L128T User Manual 21 Chapter 2 Installation After unpacking the unit, immediately inspect it for possible shipping dam- age. If damage is discovered, file a claim immediately with the shipping car- rier; then contact the ADTRAN Repair and Return department.
Chapter 2: Installation 22 Express L128/L128T User Manual 61202.070L1-1 TELEPHONE CONNECTION (L128T ONLY) Basic Telephone Service The Express L128T supports an analog DTMF telephone type (AT&T 2500) with the POTS interface, part number 1202070L2.
Chapter 2: Installation 61202.070L1-1 Express L128/L128T User Manual 23 Table 2-A Using the Flash-Hook Calling a second party with an active call. Flash-hook to place active call on hold and dial new number. Hanging up will terminate the call. Answering an incoming call with an active call at call waiting.
Chapter 2: Installation 24 Express L128/L128T User Manual 61202.070L1-1 Figure 2-1 Wiring Scheme 1: Use existing analog telephone equipment, but replace single analog telephone service with ISDN servi.
Chapter 2: Installation 61202.070L1-1 Express L128/L128T User Manual 25 Figure 2-2 Wiring Scheme 2: Retain single analog telephone service and add ISDN service To Telephone Company Yellow Red Green Bl.
Chapter 2: Installation 26 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 27 Chapter 3 Terminal Menu Operation and Structure TERMINAL MENU STRUCTURE The Express L128/L128T uses a multilevel menu structure containing both menu items and data fields. All menu operations and data display in the ter- minal menu window.
Chapter 3: Terminal Menu Operation and Structure 28 Express L128/L128T User Manual 61202.070L1-1 Figure 3-1 Top Level Terminal Menu Menu Path Describes the current position in the terminal menu structur e. Right Pane Lists available submenus. Additional submenus available through this pane are indicated by the [+] and [DA T A] symbols.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 29 Status The Status menu provides options to review and monitor the status of the Ex- press L128/L128T system. See the section Status Menu on page 90 for detailed information on the available options.
Chapter 3: Terminal Menu Operation and Structure 30 Express L128/L128T User Manual 61202.070L1-1 NAVIGATING THE TERMINAL MENUS The following sections provide information on how to navigate through the terminal menus. General Layout When you first start a terminal mode session, the window shown in Figure 3- 1 on page 28 displays.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 31 Navigation with the Keyboard You can use different keystrokes to navigate through the terminal menu. Press Control-Z to activate a pop-up screen with the available keystrokes.
Chapter 3: Terminal Menu Operation and Structure 32 Express L128/L128T User Manual 61202.070L1-1 ConÞguration F Restores factory default settings. This setting r estores the factory defaults based on the location of the cursor . Entire submenus can be factory defaulted.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 33 Security Levels Each menu item on the configuration screens has an associated security level. The security level ranges from 0 (highest security level) to 5 (lowest security level).
Chapter 3: Terminal Menu Operation and Structure 34 Express L128/L128T User Manual 61202.070L1-1 CONFIGURATION MENU Configuration/System Info The System Info menu provides basic information about the unit and displays data fields for editing information.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 35 enter up to 31 alpha-numeric characters in this field, including spaces and spe- cial characters (such as an under bar). System Contact Write security: 3; Read security: 5 Provides a user configurable text string for the contact name.
Chapter 3: Terminal Menu Operation and Structure 36 Express L128/L128T User Manual 61202.070L1-1 Configuration/WAN The WAN menu is used to set up the ISDN parameters for the Express L128/ L128T. Also, for the Express L128T, a POTS menu is provided. Figure 3-3 shows the WAN menu.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 37 (LDN(s)) and area code. Enter the 7-digit LDN in LDN 1 and LDN 2 (if a sec- ond number exists). The area code must be entered. The message Auto Spid Success will appear in the Call Log to indicate success in determining the SPID.
Chapter 3: Terminal Menu Operation and Structure 38 Express L128/L128T User Manual 61202.070L1-1 Dial Line/LDN 1 or 2 Write security: 2; Read security: 5 This option allows the entry of 0, 1, or 2 LDNs. The LDN is used when placing or receiving calls.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 39 ISDN/FEBEs Read security: 5 This contains the number of Far-End-Block-Errors (FEBEs) that have been de- tected by the ISDN circuitry on the other end of the link.
Chapter 3: Terminal Menu Operation and Structure 40 Express L128/L128T User Manual 61202.070L1-1 Configuration/IP The IP menu is used to set up the IP parameters for the Express L128/L128T. Any general IP-related configuration item is under this menu.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 41 IP/Default Gateway Write security: 3; Read security: 5 The default gateway is used by the Express L128/L128T for sending IP packets whose destination address is not found in the route table.
Chapter 3: Terminal Menu Operation and Structure 42 Express L128/L128T User Manual 61202.070L1-1 Static Routes/Private Write security: 4; Read security: 5 When set to No , the Express L128/L128T will advertise this static route using RIP. Otherwise, setting to Yes means that the route is kept private.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 43 RIP/Method Write security: 3; Read security: 5 Split Horizon - Only routes not learned on the Ethernet port are advertised. Poison Reverse (def) - All routes are advertised, including routes learned from the Ethernet port.
Chapter 3: Terminal Menu Operation and Structure 44 Express L128/L128T User Manual 61202.070L1-1 NAT/DHCP Renewal Time Write security: 3; Read security: 5 This is the number of hours that the DHCP server should allow the device be- fore it is required to send a new DHCP request.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 45 DNS/Server 2 Write security: 3; Read security: 5 This is the IP address for the secondary DNS device. It is used a back-up in case the primary address does not respond to the request.
Chapter 3: Terminal Menu Operation and Structure 46 Express L128/L128T User Manual 61202.070L1-1 UDP Relay List/UDP Port 1, UDP Port 2, UDP Port 3 Write security: 3; Read security: 5 UDP Port 1, UDP Port 2, and UDP Port 3 are used for specifying UDP ports to be relayed.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 47 Configuration/IPX The IPX menu is used to set up the IPX parameters for the Express L128/ L128T. Any general IPX-related configuration item can be found under this menu.
Chapter 3: Terminal Menu Operation and Structure 48 Express L128/L128T User Manual 61202.070L1-1 IPX/Frame Type Write security: 2; Read security: 5 The Express L128/L128T supports all four defined IPX frame types. The pos- sible frame types are: Ether Type II (def), Ether 802.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 49 IPX/SAP Timer Write security: 3; Read security: 5 This value specifies how often the Express L128/L128T sends out IPX SAP (Service Access Protocol) packets on the network segment attached to the Ethernet port.
Chapter 3: Terminal Menu Operation and Structure 50 Express L128/L128T User Manual 61202.070L1-1 Configuration/Bridge The Bridge menu is used to set up the bridge parameters for the Express L128/ L128T. The bridging function runs at the Media Access Control (MAC) level which allows any protocol packets that run over Ethernet to be forwarded.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 51 would negotiate PPP IPCP to exchange IP packets. However, if a device can only support PPP BCP, IP packets are encapsulated by the device as bridge packets.
Chapter 3: Terminal Menu Operation and Structure 52 Express L128/L128T User Manual 61202.070L1-1 WAN IPX Bridge/Network Write security: 2; Read security: 5 This is the network address of the virtual Ethernet port. See IPX/Network on page 47 for an explanation of the IPX network number.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 53 Spanning Tree/Priority Write security: 2; Read security: 5 This assigns a priority to the Express L128/L128T that permits the relative pri- ority of multiple bridges to be managed.
Chapter 3: Terminal Menu Operation and Structure 54 Express L128/L128T User Manual 61202.070L1-1 LAN Port/Path Cost Write security: 2; Read security: 5 This is the cost of using the Ethernet port in the total cost of the path. The range is from 1 to 65535 with a default of 100 (for 10 Mbits/second).
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 55 WAN Port 1/Active Write security: 2; Read security: 5 This setup is exactly like WAN Port 0 above. WAN Port 1/Path Cost Write security: 2; Read security: 5 This setup is exactly like WAN Port 0 above.
Chapter 3: Terminal Menu Operation and Structure 56 Express L128/L128T User Manual 61202.070L1-1 Configuration/Security The Security menu is used to set up the authentication parameters needed to authenticate PPP connection over the ISDN B-channels. Also, the filter defines are placed under this menu.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 57 Security/When Write security: 1; Read security: 2 The Express L128/L128T can be configured to authentic.
Chapter 3: Terminal Menu Operation and Structure 58 Express L128/L128T User Manual 61202.070L1-1 Radius Server/Retry Count Write security: 1; Read security: 2 This is the number of times the Express L128/L128T should send a request packet to the RADIUS server without a response before giving up.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 59 Security/Filter Defines The Express L128/L128T can filter packets based on certain parameters within the packet.
Chapter 3: Terminal Menu Operation and Structure 60 Express L128/L128T User Manual 61202.070L1-1 Filter Defines /Pattern Filter Defines Write security: 2; Read security: 3 The pattern filter is applied to bridge packets only. That is any packet which is forwarded by the bridge functionality of the Express L128/L128T.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 61 Dst Port Cmpr Type of comparison that is performed = - means ports equal to not = - means port not equal to > - means port greater than < - means port less than None - means the destination port is not compared Proto Protocol used for comparison.
Chapter 3: Terminal Menu Operation and Structure 62 Express L128/L128T User Manual 61202.070L1-1 Dest Socket Comp Type of comparison that is performed: = - means socket equal to Not = - means socket n.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 63 Configuration/Connection List The Express L128/L128T uses the Connection List to specify the profile each user or group of users are to have when connected.
Chapter 3: Terminal Menu Operation and Structure 64 Express L128/L128T User Manual 61202.070L1-1 Connection List/Description Write security: 3; Read security: 4 The description is a text string that identifies the profile.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 65 • When originating an outgoing call: - Express L128/L128T uses PPP method configured in Configuration/Security/PPP . - Authenticatee’s username is compared to profile used to dial.
Chapter 3: Terminal Menu Operation and Structure 66 Express L128/L128T User Manual 61202.070L1-1 PAP, CHAP or EAP - The connection can be authenticated using PAP, CHAP or EAP. CHAP or EAP - The connection can be authenticated using CHAP or EAP only. EAP - The connection will only allow authentication by the peer using EAP.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 67 Authentication/Call ID 1 Write security: 1; Read security: 3 The caller identification from the ISDN incoming call is compared to this num- ber, starting from the right digits.
Chapter 3: Terminal Menu Operation and Structure 68 Express L128/L128T User Manual 61202.070L1-1 Route/IP/Net Write security: 3; Read security: 5 The PPP peer’s IP address or network can be set here, if known. Leaving this at 0.0.0.0 means that the Express L128/L128T will determine the PPP peer’s IP and network using the PPP IPCP.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 69 IP/RIP The RIP parameters can be adjusted from their defaults under this menu.
Chapter 3: Terminal Menu Operation and Structure 70 Express L128/L128T User Manual 61202.070L1-1 RIP/Retain Write security: 3; Read security: 5 When this Connection List entry is disconnected and this parameter is set to Yes , all routes learned from this WAN connection are retained and their rout- ing interface is set to idle.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 71 IPX/Retain Write security: 3; Read security: 5 When this Connection List entry is disconnected and this parameter is set to Yes , all routes learned from this WAN connection are retained and their rout- ing interface is set to idle.
Chapter 3: Terminal Menu Operation and Structure 72 Express L128/L128T User Manual 61202.070L1-1 Connection List/Bridge The Bridge menu contains the parameters needed for exchanging bridged packets with the PPP peer.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 73 Probe/Update Window Write security: 3; Read security: 5 This is the time the Express L128/L128T stays connected during a probe. Nor- mally route and service tables are exchanged immediately after connection.
Chapter 3: Terminal Menu Operation and Structure 74 Express L128/L128T User Manual 61202.070L1-1 Multilink/BACP Write security: 3; Read security: 5 The Bandwidth Allocation Control Protocol (BACP) and Bandwidth Alloca- tion Protocol (BAP) are used to enhance Multilink PPP.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 75 PPP/Max Timer Write security: 3; Read security: 5 This value is the number of seconds to wait between unanswered configura- tion-requests. The possible values are 1 sec, 2 secs (def), 3 secs, 5 secs and 10 secs.
Chapter 3: Terminal Menu Operation and Structure 76 Express L128/L128T User Manual 61202.070L1-1 configured for voice service. In some areas, voice service costs less than data services. A speech call type does not always guarantee an end-to-end digital connection with some local and long distance carriers.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 77 Dial Out/Attempts Write security: 3; Read security: 5 This value is the number of attempts the Express L128/L128T will make before giving up on the connection.
Chapter 3: Terminal Menu Operation and Structure 78 Express L128/L128T User Manual 61202.070L1-1 When bandwidth is needed for another application, the idle timer is compared to this preempt time. If the idle timer is greater, the connection is preempted.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 79 Samples/Samples Write security: 3; Read security: 5 This is the number of WAN data rate samples taken before a decision to change bandwidth is performed. The range is 1 (def) to 255 samples.
Chapter 3: Terminal Menu Operation and Structure 80 Express L128/L128T User Manual 61202.070L1-1 Filters/In Exceptions Write security: 2; Read security: 5 This is a list of up to 32 filter entries which can be combined using the opera- tions field. The operations are performed in the order they appear on the list.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 81 Filters/Out Exceptions Write security: 2; Read security: 5 This is a list of up to 32 filter entries. The setup is exactly the same as the Filter/ In Exceptions list.
Chapter 3: Terminal Menu Operation and Structure 82 Express L128/L128T User Manual 61202.070L1-1 Filters/Dem Dial Exceptions Write security: 2; Read security: 5 This is a list of up to 32 filter entries. The setup is exactly the same as the Filter/ In Exceptions list.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 83 Configuration/Management The Express L128/L128T can be managed using Telnet, Simple Network Man- agement Protocol (SNMP), or the maintenance port. SNMP support is limited to MIB definitions.
Chapter 3: Terminal Menu Operation and Structure 84 Express L128/L128T User Manual 61202.070L1-1 Telnet/User List Up to four users can be configured for access to the Express L128/L128T. Each user can be assigned a privilege and time out. User List/Name Write security: 1; Read security: 3 A text string of the user name for this session.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 85 Management/SNMP The Express L128/L128T is an SNMP agent. It can respond to Get-Requests and generate traps. These two lists set up the manager, communities, and lev- els.
Chapter 3: Terminal Menu Operation and Structure 86 Express L128/L128T User Manual 61202.070L1-1 Traps/Manager Name Write security: 2; Read security: 4 This is the text string describing the name of the entry. It is intended for easy reference and has no bearing on the SNMP trap function.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 87 Maint Port/Parity Write security: 5; Read security: 5 This is the asynchronous parity that the maintenance port will run. The possi- ble values are None (def), Odd, or Even .
Chapter 3: Terminal Menu Operation and Structure 88 Express L128/L128T User Manual 61202.070L1-1 DIAL MENU The Dial menu is used for dialing the Connection List profile setup under Con- figuration/Connection List and for checking the status of each Connection List.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 89 Dial/Hang Up Write security: 4; Read security: 5 This is an activator used for hanging up a Connection List entry. It also re- moves retained routes from the IP and IPX routing tables when the call is not connected.
Chapter 3: Terminal Menu Operation and Structure 90 Express L128/L128T User Manual 61202.070L1-1 STATUS MENU The Express L128/L128T’s Status menu contains comprehensive status and diagnostic information used in verifying configuration and identifying prob- lems.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 91 Call Sessions/Session1 and Call Sessions/Session2 Read security: 5 The Express L128/L128T can support up to two active connections at one time.
Chapter 3: Terminal Menu Operation and Structure 92 Express L128/L128T User Manual 61202.070L1-1 Tx Link Rate - Current actual data transmission rate Rx Link Rate - Current actual data reception rate .
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 93 Status/Bridge Table Read security: 5 This lists the contents of the Express L128/L128T’s bridge table.
Chapter 3: Terminal Menu Operation and Structure 94 Express L128/L128T User Manual 61202.070L1-1 IP Routes/Hops - Number of routers that must go through to get to destination. Ranges from 0-15 or 16 for infinite (can’t get there from here). IP Routes/TTL - Seconds until address is removed from table or “zombied.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 95 Status/IPX Servers Read security: 5 This lists the contents of the Express L128/L128T’s IPX server table.
Chapter 3: Terminal Menu Operation and Structure 96 Express L128/L128T User Manual 61202.070L1-1 Status/LAN Stats Read security: 5 This menu contains statistics for the Ethernet port.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 97 ICMP redirected messages ICMP packet errors ICMP timeouts received ICMP messages sent ICMP messages rec.
Chapter 3: Terminal Menu Operation and Structure 98 Express L128/L128T User Manual 61202.070L1-1 TEST MENU The Express L128/L128T’s Test menu contains built in tests that can be used to diagnose problems.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 99 LOGS MENU The Logs menu contain logs displaying important information about the run- ning condition of the Express L128/L128T. The logs can be set to capture di- agnostics of error conditions only by way of a log level.
Chapter 3: Terminal Menu Operation and Structure 100 Express L128/L128T User Manual 61202.070L1-1 PPP Log/Active When set to Yes (def), PPP events below or equal the log level are logged into the log. PPP Log/Wrap When set to Yes (def), new PPP events will overwrite old PPP events when the log is full.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 101 Call Log/Wrap When set to Yes (def), new Call events will overwrite old Call events when the log is full. All logging will stop when the log is full and set to No .
Chapter 3: Terminal Menu Operation and Structure 102 Express L128/L128T User Manual 61202.070L1-1 Network Log/Level In order to log events, they must be at or below this level. Range is 0 to 6. The default is 3. Network Log/View This menu displays the log list.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 103 UTILITIES MENU The Express L128/L128T has utilities embedded in it to help manage and test the network and to facilitate software upgrades. Figure 3-14 shows the Utilities menu.
Chapter 3: Terminal Menu Operation and Structure 104 Express L128/L128T User Manual 61202.070L1-1 Utilities/Telnet Client Write security: 4; Read security: 5 The Telnet menu can be used to activate the telnet client function in the Ex- press L128/L128T.
Chapter 3: Terminal Menu Operation and Structure 61202.070L1-1 Express L128/L128T User Manual 105 Upgrade/Start Transfer This activator is used when the configurable items in this menu are complete. Once started, the Express L128/L128T will prompt for erasing the flash.
Chapter 3: Terminal Menu Operation and Structure 106 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 107 Chapter 4 Troubleshooting When the Express L128/L128T powers up, it performs an internal self-test. This takes about 10 seconds.
Chapter 4: Troubleshooting 108 Express L128/L128T User Manual 61202.070L1-1 probably something wrong with the translation of the line. The phone ser- vice provider should be able to help. 3. If the PWR LED still flashes, there is a physical problem with the phone line (more than likely, a problem with the Layer 1 setup).
Chapter 4: Troubleshooting 61202.070L1-1 Express L128/L128T User Manual 109 H. With the Express L128/L128T connected to the line and powered up, talk to your service provider’s repair group and inform them that your ISDN basic rate line has a physical Layer 1 problem.
Chapter 4: Troubleshooting 110 Express L128/L128T User Manual 61202.070L1-1 5. If the Loop Status in the Express L128/L128T Status menu continuously reads Register SPID #1 , then the Express L128/L128T is physically con- nected to your local telephone service provider and has established logical layer 2.
Chapter 4: Troubleshooting 61202.070L1-1 Express L128/L128T User Manual 111 6. If the Loop Status in the Express L128/L128T Status menu continuously reads Getting TEI #2 , the Express L128/L128T has completely initialized the first phone number but is unable to establish logical layer 2 for the sec- ond phone number.
Chapter 4: Troubleshooting 112 Express L128/L128T User Manual 61202.070L1-1 To isolate the problem, perform the following procedure: A. Ensure the line is multipoint with two phone numbers. B. Ensure that the Express L128/L128T is set up with the correct SPID and LDN.
Chapter 4: Troubleshooting 61202.070L1-1 Express L128/L128T User Manual 113 IF YOU ARE UNABLE TO CONNECT CALLS See Table 4-A for corrective actions if you cannot connect calls. Table 4-A Troubleshooting Calls Condition Corrective Action The PWR LED remains on, but calls cannot be placed.
Chapter 4: Troubleshooting 114 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 115 Chapter 5 Specifications SPECIFICATIONS AND FEATURES This section describes the standard specifications and features incorporated in the Express L128/L128T. Network Interface RJ-45 for ISDN Basic Rate U-Interface or RJ-45 for leased 2B1Q service.
Chapter 5: Specifications 116 Express L128/L128T User Manual 61202.070L1-1 • Supports 2 phones (27 mA loop current each) at 600 ft, 24 AWG • Supports 5 phones (12 mA loop current each) at 300 ft, .
61202.070L1-1 Express L128/L128T User Manual 117 Appendix A Loop Status Messages The Express L128/L128T displays current loop status of the ISDN on the bot- tom center line of the terminal screen. The following messages are defined: AutoSpid Download The Express L128/L128T is performing the LUCENT SPID download feature.
Appendix A: Loop Status Messages 118 Express L128/L128T User Manual 61202.070L1-1 Echo: Tx: X Rx: Y The current transmit and receive count for the PPP echo request test. Getting TEI #1 The Express L128/L128T’s ISDN layer 1 is up and is now getting the first TEI from the ISDN network.
Appendix A: Loop Status Messages 61202.070L1-1 Express L128/L128T User Manual 119 Register SPID #1 The Express L128/L128T’s ISDN layer 1 and 2 is up and is now registering SPID 2 with the ISDN network. RINGING An incoming call is ringing. B1 and B2 Bearer Channel Status Messages 56K Connected at 56K call type.
Appendix A: Loop Status Messages 120 Express L128/L128T User Manual 61202.070L1-1 Routing Incoming call state in transition . Waiting Call is between states or waiting for switch.
61202.070L1-1 Express L128/L128T User Manual 121 Appendix B Log Messages The Express L128/L128T Logs menu contains messages of events that occur. The definitions for some of those log messages are as follows: PPP Log Messages B-Channels bundled level 5 Both B-channels are bundled under multilink PPP going to a single PPP peer.
Appendix B: Log Messages 122 Express L128/L128T User Manual 61202.070L1-1 Can't find user profile level 2 The Express L128/L128T could not find an appropriate user profile for an in- coming call. Make sure that a profile has been entered under Configuration/ Connection List or that a default profile exists.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 123 IPXCP <X> down level 5 IPX Control Protocol port <X> has been dropped between Express L128/ L128T and PPP peer. IPXCP <X> up level 5 IPX Control Protocol port <X> has been successfully negotiated between Ex- press L128/L128T and PPP peer.
Appendix B: Log Messages 124 Express L128/L128T User Manual 61202.070L1-1 No IP addr for peer level 2 The Express L128/L128T cannot continue the connection because there was no IP address received from the PPP peer or it was not set in Configuration/Con- nection List/IP/Route/IP/Net parameter.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 125 Peer failed PAP authen level 3 The PPP peer’s reported PAP username and/or password does not match the Express L128/L128T’s parameters. This is most likely caused by PPP peer sending incorrect username and/or password.
Appendix B: Log Messages 126 Express L128/L128T User Manual 61202.070L1-1 AutoSpid Download Started level 4 Lucent AutoSpid download feature has started. AutoSpid Failed level 2 ExpertISDN has failed trying to determine the ISDN line’s SPID format. This can occur if the telephone company is not using standard SPID formats.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 127 Bandwidth drop level 4 The Express L128/L128T is dropping a B-channel call in order to reduce band- width. Bandwidth request level 4 The Express L128/L128T is dialing another B-channel in order to increase bandwidth.
Appendix B: Log Messages 128 Express L128/L128T User Manual 61202.070L1-1 CallID 1 in use level 2 An outgoing call on LDN 1 was dumped because it was already busy with a call. CallID 2 in use level 2 A outgoing call on LDN 2 was dumped because it was already busy with a call.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 129 NETWORK_CONGESTION NETWORK_OUT_OF_ORDER NO_CIRCUIT_AVAILABLE NO_ROUTE NO_ROUTE_TO_DEST NO_USER_RESPONDING NON_SEL_USER_CLEAR N.
Appendix B: Log Messages 130 Express L128/L128T User Manual 61202.070L1-1 Connected <number> level 5 A call from or to <number> was connected. If no caller ID is available for the ISDN line then <number> will be blank for incoming calls.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 131 Fallback to 56K level 4 The Express L128/L128T is re-dialing the same destination at 56K call type be- cause the 64K call type failed. FarDN=<number> level 5 This is far-end directory number for an incoming call.
Appendix B: Log Messages 132 Express L128/L128T User Manual 61202.070L1-1 L2 #2 not up level 2 A call attempt was stopped because ISDN layer 2 is down trying to get second TEI. L3 not up level 2 A call attempt was stopped because ISDN layer 3 is down trying to register first SPID.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 133 NOT end2end ISDN level 4 The path that the call was routed over is not ISDN from end-to-end.
Appendix B: Log Messages 134 Express L128/L128T User Manual 61202.070L1-1 Retrieved <number> level 5 The Express L128/L128T has retrieved a previously held call. If no caller ID is available for the ISDN line, then <number> will be blank for incoming calls.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 135 DHCP response sent level 4 A DHCP response was successfully sent to requesting device.
Appendix B: Log Messages 136 Express L128/L128T User Manual 61202.070L1-1 telclient bad host level 2 Telnet client could not use host name or IP address set in Configuration/Util- ities/Telnet Client/Host. telclient bad init level 2 Telnet client could not initialize a session.
Appendix B: Log Messages 61202.070L1-1 Express L128/L128T User Manual 137 TELNETD: Clr TCBF_BUFFER flag failed level 6 Debugging message related to Telnet client function. TELNETD: could not obtain peer ip level 2 Telnet server function could not get IP address of Telnet client.
Appendix B: Log Messages 138 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 139 Appendix C SNMP Understanding SNMP As Local Area Network (LAN) environments became standardized over the past ten years, multi-vendor equipment grew with competition. It became necessary to manage the various vendor equipment from a single control con- sole.
Appendix C: SNMP 140 Express L128/L128T User Manual 61202.070L1-1 Using SNMP Version 1, the network manager can issue three types of com- mands: • GetRequest : This command retrieves a single item or the first in a series from a network device. • GetNextRequest : This command retrieves the next item in a series from a network device.
Appendix C: SNMP 61202.070L1-1 Express L128/L128T User Manual 141 Communities The Express L128/L128T permits up to eight communities to be defined. The privilege level of each community can be set. The default community is public with read-only privileges.
Appendix C: SNMP 142 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 143 Appendix D Connector Pinouts Table D-A IBM/AT Style EIA-232 Interface I = Input O = Output N/A = Not Applicable N/C = Not Connected Table D-B RJ-45 ISD.
Appendix D: Connector Pinouts 144 Express L128/L128T User Manual 61202.070L1-1 Table D-C RJ-11 POTS Table D-D 10BaseT Ethernet The switch position can be set for either TO NIC or T O HUB on the back panel of the Express L128/L128T. The rear panel is illustrated in Figure 1-7 on page 18.
61202.070L1-1 Express L128/L128T User Manual 145 Appendix E Terminal Mode Commands The Express L128/L128T supports a command line interface. All menu op- tions are configurable and readable from the terminal mode. Additional com- mands are also available.
Appendix E: Terminal Mode Commands 146 Express L128/L128T User Manual 61202.070L1-1 One of the following key words must be used first: Some examples are listed below: isdn spid_1 20555512340101 sets s.
Appendix E: Terminal Mode Commands 61202.070L1-1 Express L128/L128T User Manual 147 Additional Commands Other commands available from the terminal mode are given below: Download/Uploading Configuration The Express L128/L128T’s configuration can be captured to a text file using the download command.
Appendix E: Terminal Mode Commands 148 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 149 Appendix F Frame Relay Firmware Version The L128/L128T can be used with Frame Relay if you obtain the appropriate firmware by calling ADTRAN Technical Support at the number listed in the back of this manual.
Appendix F: Frame Relay Firmware Version 150 Express L128/L128T User Manual 61202.070L1-1 Frame Relay/Maintenance Protocol Write security: 3, Read security: 5 The Frame Relay maintenance protocol is used on the WAN port.
Appendix F: Frame Relay Firmware Version 61202.070L1-1 Express L128/L128T User Manual 151 When more than one DLCI mapping is listed, the Express L128/L128T will try to match the DLCIs learned from the Frame Relay switch with the DLCI values in the map.
Appendix F: Frame Relay Firmware Version 152 Express L128/L128T User Manual 61202.070L1-1 IP Map/IARP Write security: 3, Read security: 5 When this is set to Yes (def), the Express L128/L128T will send Inverse ARP packets in order to determine the IP address on the other end of the virtual cir- cuit.
Appendix F: Frame Relay Firmware Version 61202.070L1-1 Express L128/L128T User Manual 153 IP Map/RIP Method Write security: 3, Read security: 5 The way the RIP protocol sends out its advertisements is specified here: None - All routes in the router table are advertised out this virtual circuit with no modification of the metrics.
Appendix F: Frame Relay Firmware Version 154 Express L128/L128T User Manual 61202.070L1-1 IPX Map/IARP Write security: 3, Read security: 5 When this is set to Yes (def), the Express L128/L128T will send Inverse ARP packets to determine the IPX network on the other end of the virtual circuit.
Appendix F: Frame Relay Firmware Version 61202.070L1-1 Express L128/L128T User Manual 155 DLCI Mapping/Filters The Express L128/L128T can block packets in and out of a PVC port by use of the filters.
Appendix F: Frame Relay Firmware Version 156 Express L128/L128T User Manual 61202.070L1-1 Next Oper - The next operation to use to combine with the next filter in the list: END - the last filter to combination. AND - logically AND this filter with the next filter in the list.
Appendix F: Frame Relay Firmware Version 61202.070L1-1 Express L128/L128T User Manual 157 Status/Sessions Figure F-02 shows the Status/Sessions menu that appears when using the Frame Relay firmware. The additional menu choices available with this option are described following the figure.
Appendix F: Frame Relay Firmware Version 158 Express L128/L128T User Manual 61202.070L1-1 IPXCP - Shows UP if PPP IPX Control Protocol has negotiated successfully User - Displays the user name of the PPP peer Number(s) - Shows the phone number dialed if outgoing call or caller ID if incoming call.
Appendix F: Frame Relay Firmware Version 61202.070L1-1 Express L128/L128T User Manual 159 Rx Frames - Number of Frame Relay packets that have been received via this DLCI. Tx Bytes - Number of Frame Relay bytes that have been transmitted via this DLCI.
Appendix F: Frame Relay Firmware Version 160 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 161 Glossary 10Base2 IEEE 802.3 specification, similar to Ethernet, using thin coaxial cable that runs at 10 Mbps, with a maximum distance of 185 meters per segment. Also known as Thin Ethernet or Thinwire Ethernet.
Glossary 162 Express L128/L128T User Manual 61202.070L1-1 central office (CO) In telephony, the phone company switching facility or center, usually a Class 5 end office, at which subscribers local loops terminate. Handles a specific geographic area, identified by the first three digits of the local telephone num- ber.
Glosssary 61202.070L1-1 Express L128/L128T User Manual 163 hop count A routing metric used to measure the distance between a source and a desti- nation. Particularly used by RIP. hub (1) Communications center, (2) Major routing station for connecting channels, (3) DDS connecting center.
Glossary 164 Express L128/L128T User Manual 61202.070L1-1 interworking Communication between two types of networks or end equipment. This may or may not involve a difference in signalling or protocol elements supported.
Glosssary 61202.070L1-1 Express L128/L128T User Manual 165 message The Layer 3 information that is passed between the CPE and SPCS for signal- ling. multipoint line A communications line having multiple cable access points.
Glossary 166 Express L128/L128T User Manual 61202.070L1-1 point-to-point protocol (PPP) An implementation of TCP/IP which is intended for transmission using tele- phone lines. PPP provides router-to-router and host-to-network connections over both synchronous and asynchronous circuits.
Glosssary 61202.070L1-1 Express L128/L128T User Manual 167 serving area Region surrounding a broadcasting station where signal strength is at or above a stated minimum. The geographic area handled by a telephone central office facility. Generally equivalent to a LATA.
Glossary 168 Express L128/L128T User Manual 61202.070L1-1 Telnet The TCP/IP standard protocol for remote terminal connection service. Telnet allows a user at one site to interact with a remote timesharing system at anoth- er site as if the user's terminal were connected directly to the remote machine.
Glosssary 61202.070L1-1 Express L128/L128T User Manual 169 U-interface A twisted pair subscriber loop that connects the NT1 reference point to the ISDN network, as defined in the I.411 Recommendation. This interface pro- vides Basic Rate Access with an operating frequency of 160 kbps and an infor- mation rate of 144 kbps.
Glossary 170 Express L128/L128T User Manual 61202.070L1-1.
61202.070L1-1 Express L128/L128T User Manual 171 Acronyms AEP ................... AppleTalk Echo Protocol AMI ................... Alternate Mark Inversion ARP ................... Address Resolution Protocol B (Channel) .... A 64 kbps digital information channel BCP .
Acronyms 172 Express L128/L128T User Manual 61202.070L1-1 ISDN ..................Integrated Services Digital Network ISO .....................International Standardization Organization ISP ......................Internet Service Provider kbps .........
61202.070L1-1 Express L128/L128T User Manual 173 Index Numerics 10-base-T interface 144 56K 76 64K 76 A address table 55 address table/aging 55 address table/forward policy 55 agent 139, 140 applicati.
Index 174 Express L128/L128T User Manual 61202.070L1-1 bridge/WAN IPX bridge 51 bridging 13 concurrent routing and bridging 15 demand 12 C call log 100 call log messages 125 call log/active 100 call l.
Index 61202.070L1-1 Express L128/L128T User Manual 175 dial line 36 dial line/area code 37 dial line/ExpertISDN 36 dial line/LDN 1 or 2 38 dial line/SPID 1 37 dial line/switch protocol 37 dial menu 27.
Index 176 Express L128/L128T User Manual 61202.070L1-1 frame relay/DLCI mapping 150 frame relay/maintenance protocol 150 frame relay/polling frequency 150 frame type 48 front panel 16 G GetNextRequest.
Index 61202.070L1-1 Express L128/L128T User Manual 177 IPX/RIP timer 48 IPX/SAP timer 49 IPX/seed status 48 IPX/triggered 70 IPX/type 20 packets 71 ISDN connection 18 network connection 21 ordering 19.
Index 178 Express L128/L128T User Manual 61202.070L1-1 internet access using 2 network connection ISDN 21 network device GetResponse 140 network interface 115 network log 101 network log messages 134 .
Index 61202.070L1-1 Express L128/L128T User Manual 179 RIP 12, 15, 42, 69 RIP timer 48 RIP/direction 43, 69 RIP/method 43, 69 RIP/mode 42, 69 RIP/protocol 42, 69 RIP/retain 70 RIP/triggered 69 RIP/V2 .
Index 180 Express L128/L128T User Manual 61202.070L1-1 status/bridge table 93 status/call sessions 90 status/IP routes 93 status/IP stats 96 status/IPX routes 94 status/IPX servers 95 status/LAN stats.
Index 61202.070L1-1 Express L128/L128T User Manual 181 user list/password 84 using keyboard to navigate menu 31 utilities menu 29, 103 utilities/exit 105 utilities/ping 103 utilities/Telnet client 104.
Index 182 Express L128/L128T User Manual 61202.070L1-1.
Product Support Information Presales Inquiries and Applications Support Please contact your local distributor, ADTRAN Applications Engineering, or ADTRAN Sales: Post-Sale Support Please contact your local distributor first. If your local distributor cannot help, please contact ADTRAN Technical Support and have the unit serial number available.
Een belangrijk punt na aankoop van elk apparaat ADTRAN L128 (of zelfs voordat je het koopt) is om de handleiding te lezen. Dit moeten wij doen vanwege een paar simpele redenen:
Als u nog geen ADTRAN L128 heb gekocht dan nu is een goed moment om kennis te maken met de basisgegevens van het product. Eerst kijk dan naar de eerste pagina\'s van de handleiding, die je hierboven vindt. Je moet daar de belangrijkste technische gegevens ADTRAN L128 vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding ADTRAN L128 leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over ADTRAN L128 krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van ADTRAN L128 bent, maar toch heb je de instructies niet gelezen, moet je het doen voor de hierboven beschreven redenen. Je zult dan weten of je goed de alle beschikbare functies heb gebruikt, en of je fouten heb gemaakt die het leven van de ADTRAN L128 kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met ADTRAN L128 . Bijna altijd, zal je daar het vinden Troubleshooting met de meest voorkomende storingen en defecten #MANUAl# samen met de instructies over hun opplosinge. Zelfs als je zelf niet kan om het probleem op te lossen, zal de instructie je de weg wijzen naar verdere andere procedure, bijv. door contact met de klantenservice of het dichtstbijzijnde servicecentrum.
