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Cisco 1700 Series Modular Access Routers

WIC-1B-S/T and WIC-1B-U Cable Specifications

Cisco - WIC-1B-S/T and WIC-1B-U WAN Interface Cards Cable Specifications

Document ID: 46796

Updated: Jul 07, 2005

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Introduction

This document provides the technical specifications and cable requirements for the WIC-1B-S/T and WIC-1B-U WAN interface cards.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This document is not restricted to specific software and hardware versions.

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.

Conventions

For more information on document conventions, see the Cisco Technical Tips Conventions.

WIC-1B-S/T Interface Card

WIC-1B-ST.gif

The Integrated Services Digital Network (ISDN) Basic Rate Interface (BRI) WAN interface cards are shared between the Cisco 1600, 1720, 2600 and 3600 Series Routers. Each card supports a single ISDN BRI port offered with and without the NT1 interface.

The S/T WAN interface card module (WIC-1B-S/T) needs the external Network Termination 1 (NT1) device whereas the U WAN interface card module (WIC-1B-U) has an internal NT1 device.

Cables

The WIC-1B-S/T interface card requires RJ-45 to RJ-45 straight-through cables (provided by the customer).

ISDN BRI S/T Port Pinouts

The table below shows the ISDN BRI S/T port pinouts (RJ-45).

8 Pin1 TE2 NT3 Polarity
3 Transmit Receive +
4 Receive Transmit +
5 Receive Transmit -
6 Transmit Receive -

1Pins 1, 2, 7, and 8 are not used.

2TE refers to terminal terminating Layer 1 aspects of TE1, TA, and NT functional groups. This applies to the Cisco 1603 and the ISDN BRI S/T WAN interface card.

3NT refers to network terminating Layer 1 aspects of NT1 and NT2 functional groups. This applies to the Cisco 1604 ISDN S/T port.

BRI S/T WAN Interface Card LEDs

The table below lists the BRI S/T WAN interface card LEDs and their meaning.

LED Meaning
B1 Active connection on B1 channel
B2 Active connection on B2 channel
OK ISDN port has established a connection with the central office switch

WIC-1B-U WAN Interface Card

WIC-1B-U.gif

ISDN BRI U Port Pinouts (RJ-45)

The table below lists the ISDN BRI U port pinouts and their function.

8 Pin1 Function
3 No connection
4 Signal -- Tip or Ring
5 Signal -- Tip or Ring
6 No connection

1Pins 1, 2, 7, and 8 are not used.

ISDN BRI U WAN Interface Card LEDs

The table below lists the ISDN BRI U WAN interface card LEDs and their meaning.

LED Meaning
B1 Active connection on B1 channel
B2 Active connection on B2 channel
NT1 NT1 has established a connection with the central office switch

ISDN BRI Cable Specifications

The table below lists the ISDN BRI cable specifications.

Specification High-capacitance Cable Low-Capacitance Cable
Resistance (at 96 kHz) 160 ohms/km 160 ohms/km
Capacitance (at 1 kHz) 120 nF1/km 30 nF/km
Impedance (96 kHz) 75 ohms 150 ohms
Wire diameter 0.024" (0.6 mm) 0.024" (0.6 mm)
Distance limitation 32.8' (10 m) 32.8' (10 m)

1 nF = nanoFarad

Related Information

Updated: Jul 07, 2005
Document ID: 46796