Specifications

Channelized and Electrical Interface Line Card Installation and Configuration

78-16417-02

Verifying and Troubleshooting the Line Card Installation

Table 12 lists some approximate attenuation values from the ANSI standard, and shows the RG-179

attenuation. As you can see, RG-179 has a much higher attenuation, so take this information into account

if you plan long runs of RG-179 cable.

Verifying and Troubleshooting the Line Card Installation

The following sections describe how to verify and troubleshoot the line card installation:

• Initial Boot Process, page 30

• Status LEDs, page 31

• Alphanumeric LEDs, page 35

• Troubleshooting the Installation, page 39

• SONET/SDH Clocking Issues, page 40

Initial Boot Process

Note Many new line cards are designated as administratively down by default. Status LEDs are off until you

configure the interfaces and use the no shutdown command.

During a typical line card boot process, the following events occur:

1. The line card maintenance bus (MBus) module receives power and begins executing the MBus

software.

2. The line card MBus module determines the type of card on which it resides, performs internal

checks, and prepares to accept the Cisco IOS software from the RP.

3. The RP powers up the line card and loads the line card with its Cisco IOS software.

To verify that the line card is working properly, perform the following operational checks:

• During the line card boot process, observe the line card alphanumeric LEDs to ensure that the card

is running the typical initialization sequence. The sequence should end with IOS RUN.

• Observe the line card status LEDs to verify that the Active LED (Link LED or status LED for line

cards with no Active LED) is on. If an Active LED is not on, verify that the associated interface is

not shut down.

Table 12 ANSI Standard Cable-Attenuation Values

Approximate Cable Attenuation (dB) from ANSI Standard T1.404-1994

DSX-3 Point

Transmitter-to-receiver

distance (max) RG-179

Frequency 100 ft (30 meters) 450 ft (137 meters) 900 ft (274 meters) 100 ft (30 meters)

1 MHz 0.27 1.2 2.4 3.0

10 MHz 0.80 3.6 7.2 5.3

50 MHz 1.82 8.2 16.4 8.5

100 MHz 2.64 11.9 23.8 10.0