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