Cisco CAB-232MT= Fiche technique télécharger pdf (Page 8)

C-8

Cisco 7100 Series VPN Router Installation and Configuration Guide

78-6341-03

Appendix C Cable Specifications

Cisco 7120-4T1 and Cisco 7140-8T Cables and Pinouts

Balanced drivers allow EIA/TIA-449 signals to travel greater distances than EIA/TIA-232 signals. The

recommended distance limits for EIA/TIA-449 shown in Table C-7 are also valid for V.35, X.21, and

EIA-530. EIA/TIA-449 and EIA-530 support 2.048-Mbps rates, and V.35 supports 2.048-Mbps rates

without any problems; we do not recommend exceeding published specifications for transmission speed

versus distance. Do so at your own risk.

EIA/TIA-232 Connections

The router end of all EIA/TIA-232 adapter cables is a high-density 60-pin plug. The network end of the

adapter cable is a standard 25-pin D-shell connector (known as a DB-25) that is commonly used for

EIA/TIA-232 connections. Figure C-5 shows the connectors at the network end of the adapter cable.

Do not use the Cisco Systems-provided EIA/TIA-232 adapter cable product number CAB-232MT= to

connect a T1 interface that is configured for DTE mode directly to an NEC - NEXTSTAR 1E model

C4969 MD/SAC unit interface that is configured for DCE mode. Doing so will keep transmit and receive

data signals from being properly exchanged between the two interfaces.

Instead, you must connect an additional, intermediate adapter cable—with standard EIA/TIA-232

DB-25 connectors at both ends—from the network end of product number CAB-232MT= to the standard

EIA/TIA-232 DB-25 connector (the DCE interface) on the NEC - NEXTSTAR 1E model C4969

MD/SAC unit. Cisco Systems does not provide this additional cable; however, its signals and pin

assignments are listed in Table C-8.

You can use the Cisco Systems-provided EIA/TIA-232 adapter cable product number CAB-232FC= to

connect a T1 interface that is configured for DCE mode directly to an NEC - NEXTSTAR 1E model

C4969 MD/SAC unit interface that is configured for DTE mode. This cable’s pin assignments are listed

in Table C-9.

Figure C-5 EIA/TIA-232 Adapter Cable Connectors

56000 8.6 2.6 102 31

1544000 (T1) – – 50 15

Table C-7 Recommended (Standard) Maximum Speeds and Distances for Serial Interfaces (continued)

EIA/TIA-232 Distances EIA/TIA-449, X.21, V.35, EIA-530 Distances

Table C-8 EIA/TIA-232 Adapter Cable Signals (DTE)

DTE Cable (CAB-232MT=)

Router End, HD

60-Position Plug

Network End,

DB-25 Plug

Signal Pin Pin Signal

H1343a

DTE

DCE

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 25 26

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