TRUNK Channel out of service

[UP82]

Good morning,
i am trying to create a E1 connection between a Media Gateway (PRA-T2 board) and another equipment that use Sangoma A102 E1 board.
The trunk created show that each channel is HS.

Layer 1 troubleshooting:

config 2 5
+-------------------------------------------------------------------+
| Cr | cpl| cpl type | hw type | cpl state | coupler ID |
|----|----|------------|-----------|--------------|-----------------|
| 2 | 5 | PRA T2|---------- | IN SERVICE | NO PCMS CODE |
+-------------------------------------------------------------------+

infocs

+----------------------------------------------------------------------+
| N_CR | N_CPL | TYPE | N_ACCES | PRIO | SYNC_CLOCK | TG/LK |
+----------------------------------------------------------------------+
+----------------------------------------------------------------------+

+---------------------------------------------------------------------+
| Synchronization on global domain |
+---------------------------------------------------------------------+
+---------------------------------------------------------------------+
| Synchronization on domain no 2 |
+---------------------------------------------------------------------+
| N_CR | N_CPL | TYPE | N_ACCES | PRIO | SYNC_CLOCK | TG/LK |
+---------------------------------------------------------------------+
| 2 | 5 | PRA T2 | 0 | 200 | SYNCHRO | TG:1 |
+------------------------------------------------------------------

No red LED on the boards and E1 cable should be good

Layer 2 troubleshooting:


trkstat 2 5

Fri Jan 21 14:33:58 EET 2022
+------------------------------------------------------------------------------+
| T R U N K S T A T E - PRA T Coupler Crystal_nbr = 2 |
| IN SERVICE Coupler Nbr = 5 |
+------------------------------------------------------------------------------+
| Access 0 Type : T2 access : ENABLED level2 : ATT_CONNECT2 |
| |
| Trunk Grp 12 12 12 12 12 12 12 12 12 12 12 12 |
| Channel 1 2 3 4 5 6 7 8 9 10 11 12 |
| State hs hs hs hs hs hs hs hs hs hs hs hs |
| |
| Trunk Grp 12 12 12 12 12 12 12 12 12 12 12 12 |
| Channel 13 14 15 17 18 19 20 21 22 23 24 25 |
| State hs hs hs hs hs hs hs hs hs hs hs hs |
| |
| Trunk Grp 12 12 12 12 12 12 |
| Channel 26 27 28 29 30 31 |
| State hs hs hs hs hs hs |
+------------------------------------------------------------------------------+
| F: Free | B: Busy | Ct: busy Comp trunk | Cl: busy Comp link |
| WB: Busy Without B Channel| Cr: busy Comp trunk for RLIO inter-ACT link |
| WBD: Data Transparency without chan.| WBM: Modem transparency without chan. |
| D: Data Transparency | M: Modem transparency |
+------------------------------------------------------------------------------+
| ALARM COUNTERS |
+------------------------------------------------------------------------------+
| NOS | AIS | LOS | FEC/CEC | RAI |
| 15 | 0 | 0 | 0 | 3 |
|------------------------------------------------------------------------------|
| NOS : no signal | LOS : loss of synchronization |
| AIS : alarm indication signal | FEC/CEC : Frame/Checksum error counter |
| RAI : remote alarm indication | |
+------------------------------------------------------------------------------+

incvisu
:2113=T2 lapD not established still trying
21/01/22 14:02:05 000001M|02/05/-/---|=4:3580=remove TEI: mod ISDN UNSUCCESSFULL_RETRANS_OF_SABME (0) realy:0 info:0

The problems seems at Layer 2 when trying to establish LAPD connection.
Anyway also in ATT_CONNECT2 state the TrkGrp should be F instead of HS (see TG0011 pag 29)

Any ideas? Is there a command to clear the alarms counter?
Thanks a lot
UP

[haroun]

two alamrs you got there
NOS means No Signal
Rai the remote side doesn't receive signal from your side
i think you should corss the cable

[vad]

ATT_Connect2 - I think you have the same management for Network Mode (Shelf/board/digital access). For CCS E1 - you must have Network mode=yes (Master, Network, NT) from one end and Network mode=no (User, Slave, TE) from another.

[UP82]

thanks a lot for your reply , the problem was the network mode in both side

[haroun]

yep thta's right if it was a cable issue you can only have one side alarm