Gebruiksaanwijzing /service van het product MWR 1941-DC-A van de fabrikant Cisco
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Americas Headquarters Cisco Systems, In c. 170 West Tasman Drive San Jose, CA 951 34-1706 USA http://www.ci sco.com Tel: 408 526-4000 800 553-NETS (638 7) Fax: 408 527-0883 Cisco MWR 1 941 -DC-A Mobil.
THE SPECIFICATION S AND INFORMATION REGARDING THE P RODUCTS IN THIS MA NUAL ARE SUBJECT TO CHANGE WITH OUT NOTICE. ALL STATEMENTS , INFORMATION, AND RECOMMENDATI ONS IN THI S MANUAL ARE BE LIEVED TO BE A CCURATE BUT ARE PRESENTED WI THOUT WARRANTY OF ANY KIND, EX PRESS OR IMPLIED.
iii Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 CONTENTS About This Guide vii Document Revision History viii Objectives viii Audience viii Organization viii .
Contents iv Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Cisco MWR 1941-DC-A Router Interface Numb ering 1-14 Slot and Port Numbering 1-14 Regulatory Complian.
Contents v Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Connecting the Network Cables 3-10 Connecting the Cisco 2-port T1/E 1-RAN (VWIC-2T1/E1-RAN) Interface .
Contents vi Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04.
vii Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide This preface describes the objectiv es, audien ce, organizatio n, and con ventions of this har dwar e installation gu ide . Note Use this document along with the do cuments listed in the “Related Documentation” section on page xv .
viii Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Document Revision Histo ry Document Revision History The Document Re vision History table b elow reco rds technical changes to this documen t.
ix Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Conventions Conventions This guide uses the follo wing con ventio ns to con vey instructions and i nformation. Note Means reader take note . Notes contain helpful suggestions or references to material not co vered in the manual.
x Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Safety Warnings Safety Warnings Safety warnings appear th roughout this publicati on in procedures that, if p erformed incorrectly , might harm you.
xi Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Safety Warnings Warnung WICHTIGE SICHERHEITSHINWEISE Dieses Warnsymbol b edeutet Gefahr . Sie befinden sich in einer Situation, die zu V erletzungen führen kann.
xii Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Safety Warnings Va r n i n g ! VIKTIGA SÄKERHETSANVISNINGAR Denna varningssignal signalerar fara. Du befinner dig i en situation som kan leda till personskada.
xiii Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Safety Warnings Avi so INSTRUÇÕES IMPORT ANTES DE SEGURANÇA Este símbolo de aviso significa perigo. V ocê se encontra em uma situação em que há risco de lesões corporais.
xiv Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Safety Warnings.
xv Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Related Documentation Related Documentation For informatio n beyond t he scope of this docume.
xvi Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 About This Guide Obtaining Documentation, Obtain ing Support, and Security Guidelin es Obtaining Documentatio.
CH A P T E R 1-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 1 Product Overview The Cisco MWR 1941-DC-A Mobile W ireless Edge Ro uter is a general purpose router platform specializing in 2/2.
1-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Introduction Introduction A typical RAN is composed of th ousands of Base T ransc.
1-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Introduction Cisco Abis and Iub Optimization over IP Implementation One solution that mobile wir eless operator’ s find of v alue is Cisco’ s ability to optimize RAN backhaul eff i ciency (see Figure 1- 2 ).
1-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Introduction Cisco GSM Abis Optimization over IP The Cisco GSM Abis Optimization .
1-5 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Introduction Thus, the cell site becomes a physical Po int-of-Prese nce or POP fr om which to of fer hotspot services, or voice and wired ISP services to nearb y enterpri ses and residences.
1-6 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Hardware Descrip tion Hardware Description Contained in a standard shelf-rack enclosure, the Cisco MWR 1941-DC-A router weighs 10.5 po unds (4.
1-7 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Hardware Description • Front access cabling • Three green chassis LEDs (see t.
1-8 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Hardware Descrip tion Figur e 1 -4 Cisco MWR 1 941 -DC-A Rout er Fr ont View LEDs Ta b l e s 1-1 , 1-2 , and 1-3 describe the Cisco MWR 1941-DC-A LEDs located on th e front panel.
1-9 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Hardware Description Note In a redund ant configuration, when th e relays of th e 2-port T1/E1-RAN close, th e Data Carrier Detect LED on the T1 ports will remain on and the ALARM LED will go of f.
1-10 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Hardware Descrip tion Figur e 1 -5 Cisco MWR 1 941 -DC-A Route r Rear V iew Adva.
1-11 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Cisco Network M odules Interface Cards The Cisco MWR 1941-DC-A router supports t.
1-12 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Compact Flash Memory Compact Flash Memory One internal 128MB fix ed compact flash (CF) de vice is used on the Cisco MWR 1941- DC-A router .
1-13 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Environmental Moni toring Temperature Sensor The Cisco MWR 1941-DC-A router uses a small, thre e-wire connector (Phoenix Contact part nu mber 1756272) for input to the po wer supply .
1-14 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Cisco MWR 1941-DC-A Ro uter Interface Numbering Cisco MWR 1941-DC-A Router Interface Numbering Each network interface on a Cisco MWR 1941-DC-A rout er is identified by a slot number and a port number .
1-15 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 1 Product Overview Regulatory Compliance • The two b uilt-in Ethernet 10/1 00 interfaces ar e Fast Et hernet 0/0 and Fast Ethernet 0/1.
1-16 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 1 Produ ct Overview Regulatory Compliance.
CH A P T E R 2-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 2 Preparing to Install the Router This chapter describe s site requirements and equi pment needed to install you r Cisco MWR 1941-DC-A router .
2-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 2 Prepa ring to Install the Router Safety Guidelines Safety Guidelines Before you be gin the installa.
2-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 2 Preparing to Install the Router Safety Guidelines War ni ng Before working on equipme nt that is connected to power line s, remove jewelry (including rings, necklaces, and watches).
2-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 2 Prepa ring to Install the Router Before You Begin Preventing Electrostatic Discharge Damage Electrostatic disc harge (ESD) can damage equipm ent and impair e lectrical circuitry .
2-5 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 2 Preparing to Install the Router Site Planning Site Environment The Cisco MWR 1941-DC-A router is install ed in an equipment rack.
2-6 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 2 Prepa ring to Install the Router Site Planning Method of Procedure As described pre v iously , part of your preparation incl udes re vie wing installation plans or MOPs.
2-7 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 2 Preparing to Install the Router Site Planning Inspect all items for shipp ing damage. If anything app ears to be damaged, or if you encounter problems installing or conf iguring your r out er , contact customer service.
2-8 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 2 Prepa ring to Install the Router Site Planning Installation Checklist T o assist you with your instal lation and to pro vide a historical record of wh at was done, and by whom, use the following Installation Checklist.
2-9 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 2 Preparing to Install the Router Console and Auxilia ry Port Considera tions Creating a Site Log The Site Log (see Appendix C, “Site Log” for a sample Site Log) provides a record of all actions related to installing and maintaini ng the router .
2-10 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 2 Prepa ring to Install the Router Console and Auxiliary Port Considerations Console Port Connections The router includes an EI A/TIA-2 32 asynchronous serial con sole port (RJ-45).
CH A P T E R 3-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 3 Installing the Cisco MWR 1941-DC-A Router This chapter describes ho w to install your Cisco MWR 1941-DC-A router and ho w to connect it to networks and external de vices.
3-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Network Mod ule s and Interfac e Cards Network Modules and Interface Cards Cisco routers are normally shipped wi th the NM -2W netw ork modules and the 2-port T1/E1-RAN interface card alread y installed.
3-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Mounting the Cisco MWR 1941-DC-A Router Rack-Mounting C.
3-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Mounting the Ci sco MWR 1941-DC-A Router Figur e 3-1 Attac hing the Brac k et Proceed to the next sectio n, “Mounting the Cisco MWR 1941-DC-A Rou ter in a Rack” to contin ue the installati on.
3-5 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Connecting the Chassis Grou nd and Power Note The vertical spacin g for EIA equipment racks is 1.75 inches (4.
3-6 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Connecting the Chassis Ground and Power Figur e 3-2 Ci sco MWR 1 941 -DC-A Route r Rear V iew Follo w these procedures to ground the router to earth g round.
3-7 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Connecting the Chassis Grou nd and Power Figure 3-4 Cr .
3-8 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Connecting Cab les Step 2 Plug the 3-pin black termin al .
3-9 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Connecting Cab les Cisco provides the fol lowin g cable.
3-10 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Connecting Cab les Console Port Follo w these steps to c.
3-11 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Connecting Cab les Connecting the Fixed Fast Ethernet In terface Cable The RJ-45 port supports standard straight-through and crosso ver Cate gory 5 unshielded twi sted-pair (UTP) cables.
3-12 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Connecting Cab les Step 2 Connect the end of one of the Y - cable stubs to the T1 or E1(RJ-48C) port on the Cisco 2-port T1/E1-RAN on the f irst router .
3-13 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Connecting Cab les Y-Cable Specifications As described.
3-14 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Powering U p the Router Cable-Management All Cisco router cables should be properly dressed so as not to interfere with each other or other pieces of equipment.
3-15 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Powering Up the Router – Off when no data is being transmitted. • Speed (SPEED), green: – On when 100-Mbps communi cation speed has been attain ed.
3-16 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Powering U p the Router The Class C Flash f ile system i.
3-17 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Powering Up the Router CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC.
3-18 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Powering U p the Router Delete Files from a Flash Memory Card T o delete a file from a CF memory card, use the delete slot0: file n am e command.
3-19 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Ha rdware Installation Guide OL-7872-04 Chapter 3 Installin g the Cisco MWR 1941-DC-A Router Powering Up the Router 00000120: 679C4A80 3C018001 AC3DC70C 3C018001 g.J. <... ,=G. <... 00000130: AC3FC710 3C018001 AC24C714 3C018001 ,?G.
3-20 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Chapter 3 Installing the Cisco MWR 1941-DC-A Router Powering U p the Router 128094208 bytes total (121626624.
A-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware In stallation Guide OL-7872-04 APPENDIX A Troubleshooting Y our Cisco MWR 1941-DC-A router under goes extensi ve testing before it lea ves the fa ctory .
A-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix A Troubleshooting Problem Solving • Cables—Ensure that the external cables connect ing the router to the networ k are all secure .
A-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix A Troubleshooting Problem Solving Troubleshooting Modules, Cables, and Connections Network pr oblems.
A-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix A Troubleshooting Reading the LEDs Reading the LEDs The LEDs on the front panel of th e router and corresponding modules are aids for determi ning router and module performance and operati on.
A-5 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix A Troubleshooting Reading the LEDs Note In a redund ant configuration, when the rel ays of the Cisco 2-port T1/E 1-RAN close, the Da ta Carrier Detect LED on the T1 ports will remain on an d the ALARM LED will go of f.
A-6 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix A Troubleshooting Reading the LEDs.
B-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware In stallation Guide OL-7872-04 APPENDIX B Cable Specifications If you prefer to b uild your o wn cables, this ap pendix provides cabl e specifications for the Cisco MWR 1941-DC-A router and the Cisco 2- port T1/E1-RAN interface card.
B-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix B Cable Sp ecifications Console and Auxiliary Port Signals and Pinouts Console and Auxiliary Port Si.
B-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix B Cable Specifications Console and Auxiliary Port Signals and Pinouts Ta b l e B - 2 lists the pin outs for the asynchron ous serial console port, th e RJ-45-to-RJ-45 rollo ver cab le, and the RJ-45-to-DB-25 female DTE adapter (labeled TERMIN AL).
B-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix B Cable Sp ecifications Fast Ethernet Co nnector Pinouts T o identify a rollov er cable compare the modular plug s at the two ends of the cable.
B-5 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix B Cable Specifications T1/E1 Port Pinouts (RJ-48) T1/E1 Port Pinouts (RJ-48) Figure B-4 sho ws the R.
B-6 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix B Cable Sp ecifications T1/E1 Port Pinouts (RJ-48).
C-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware In stallation Guide OL-7872-04 APPENDIX C Site Log The Site Log pro vides a record of all actions relat ed to installing and maint aining the router . Keep it in an accessible place near the cha ssis so that anyone who performs tasks has a ccess to it.
C-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 Appendix C Site Log T able C-1 Site Lo g Date Description of Action Performed or Symptom Observed Initials.
IN-1 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 INDEX A adapter pinouts B-2, B-3 audience viii auxiliary port adapter pinouts B-3 connecting 3-10 connection.
Index IN-2 Cisco MWR 1941-DC-A Mobile Wireless Edge Rout er Hardware Inst allation Gu ide OL-7872-04 H hardware installing 3-1 troubleshooting p rocedures A-1 I installati on checklist 2-8 hardware 3-.
Index IN-3 Cisco MWR 1941-DC-A Mobile Wireless Edge Router Hardware Installation Guide OL-7872-04 system 1-13 specifications, system 1-13 system specifications 1-13 T temperature sensor 1-13 tools req.
Index IN-4 Cisco MWR 1941-DC-A Mobile Wireless Edge Rout er Hardware Inst allation Gu ide OL-7872-04.
Een belangrijk punt na aankoop van elk apparaat Cisco MWR 1941-DC-A (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 Cisco MWR 1941-DC-A 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 Cisco MWR 1941-DC-A vinden. Op dit manier kan je controleren of het apparaat aan jouw behoeften voldoet. Op de volgende pagina's van de handleiding Cisco MWR 1941-DC-A leer je over alle kenmerken van het product en krijg je informatie over de werking. De informatie die je over Cisco MWR 1941-DC-A krijgt, zal je zeker helpen om een besluit over de aankoop te nemen.
In een situatie waarin je al een beziter van Cisco MWR 1941-DC-A 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 Cisco MWR 1941-DC-A kunnen verkorten.
Maar de belangrijkste taak van de handleiding is om de gebruiker bij het oplossen van problemen te helpen met Cisco MWR 1941-DC-A . 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.