Lucent Technologies Comcode 108678723 manual Diagnostics

DEFINITY ECS Release 8.2 ATM Installation,	Issue 1
Upgrades, and Administration 555-233-124	April 2000
6 Troubleshooting
Troubleshooting ATM-PNC	6-39

Incorrectly typed or omitted EPN route or end system identifier (ATM switch)

Symptoms

Talk paths are one-way, from the PPN to the EPN: you can hear tones from the PPN end station to the EPN end station but not vice versa. Because the signaling channels are bidirectional virtual circuits (VCs) established from the PPN to the EPN, these can be routed correctly and come up just fine. Talk paths are two unidirectional virtual circuits, so a single call has one VC from the PPN to the EPN (which is routed correctly) and one VC from the EPN to the PPN (which cannot be routed).

Diagnostics

1.At the ATM switch, check the ATM addresses.

2.Look for a cause code 3 (No route to destination).

Action

1. Correct the ATM address translations in the ATM switch.

Swapped routes, end system identifiers, or fiber between a PPN and an EPN

Symptoms

■An incorrectly connected EPN TN2305/TN2306 circuit pack is not completely inserted.

■Dial tone is present on end stations on the PPN and on correctly connected EPNs, but no dial tone is present on the affected EPN end stations.

■Calls cannot be made between the PPN and the correctly connected EPNs because talk paths cannot be routed correctly.

Diagnostics

1.Check to see if the ATM switch shows VBR control channels from the ATM switch port intended for the incorrectly connected EPN (but actually connected logically or physically to the PPN) that should not exist.

Action

1.Correct the ATM addresses (or swap fibers) on the ATM switch between the incorrectly connected PPN and EPN.