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Bug #6015

open

osmo-pcu (with ericsson RBS) is unable to keep TRAU frames in sync

Added by dexter 10 months ago. Updated 2 months ago.

Status:
New
Priority:
Normal
Assignee:
Target version:
-
Start date:
04/25/2023
Due date:
% Done:

0%

Spec Reference:

Description

The problem is observed with an RBS installation that uses a DUG20 but a different (presumably older, RRUS 01?) transceiver. The symptom is that the PCU is unable to get a reliable sync on the TRAU frames coming from the CCU (transceiver unit). The CCU eventually closes the channel.

we see the following messages:

Mon Apr 24 09:34:08 2023 <0010> trau/trau_sync.c:519 trau_sync(trau-sync){FRAME_ALIGNED}: state_chg to FRAME_ALIGNMENT_LOST
The reasons for this could be:
  • Unreliable E1 connection (the setup uses icE1usb+osmo-e1d)
  • The transceiver module has a slightly different TRAU frame format (unlikely)
  • Bug in the TRAU synchronizer of libosmo-abis

Files

pcu-startup.log.gz pcu-startup.log.gz 282 KB dexter, 04/25/2023 08:56 AM
pcu-startup-64k.log.gz pcu-startup-64k.log.gz 195 KB dexter, 04/25/2023 08:56 AM
pcu_log.gz pcu_log.gz 65.8 KB keith, 04/28/2023 11:06 AM
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