Instruction manual

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4-3. TROUBLESHOOTING INSTRUCTIONS

In case a problem occurs, refer to Table 4-1, identify the closest description of the

trouble symptoms and perform the actions listed under “Corrective Measures” in

the order given, until the problem is corrected.

Whenever the problem appears upon first-time operation of a new link, or just after

the configuration of an existing link has been changed, before starting the trou-

bleshooting check again all the internal settings of the local and remote DV-MUX3

units against the prescribed parameters.

Table 4-1. Troubleshooting Chart

No. Symptoms Probable Cause Corrective Measures

1 PWR off 1. No AC power Check that both ends of the AC power cable are

properly connected, and that power is available

at the mains outlet to which the DV-MUX3 is

connected.

2. Blown fuse Replace with fuse of proper rating

3. Defective DV-MUX3 Replace the DV-MUX3

2 TEST flashes

SYNC LOSS lights

TD, RD/ERR lights

Local DV-MUX3 failed

self-test

Check whether the voice channels module is

installed.

Replace the local DV-MUX3

3 TEST flashes

SYNC LOSS lights

TD, RD/ERR off

Local DV-MUX3 does

not receive valid clock

signals from the data

communication

equipment connected to

its main link connector

Check that the connection cable between the

local DV-MUX3 and the data communication

equipment connected to its main link connector

is in order.

Check that the data communication equipment is

configured to operate as a DCE and that it

supplies transmit and receive clock signals at the

correct rate to the DV-MUX3

4 TEST off

SYNC LOSS lights

1. Problem in the data

transmission facility

Perform troubleshooting of the data transmission

facility that connects the two DV-MUX3

2. Problem at local

DV-MUX3

Activate the local loopback on the DCE

equipment connected to the main link.

If the SYNC LOSS indicator continues to light,

replace the local DV-MUX3

3. Problem at the

remote DV-MUX3

Repeat the procedure given for probable causes

above on the remote DV-MUX3

TROUBLESHOOTING INSTRUCTIONS

DV-MUX3 Installation and Operation Manual 4-5