[Asterisk-Dev] E1, crc-4 errors

[Konrad Gorski]

Hi,
My PBX config: 
Telco (Lucent SS7) E1 line (crc4) <=> * box + E100P, T100P, Zplex <=>
analog phones and ATA186 (SIP and MGCP)
* is working very good, but from Telco side are problems.
Telco's list of errors:
----------------------------------------------------------
   ERROR STATISTICS FOR : ALL MEASUREMENT TYPES
   --------------------
   
   MEASUREMENT PERIOD : CURRENT DAY
   
   ES CALCULATION MODE          = CRC-4
   FAC AVAILABLE TIME           = 09:58:45 HOURS
   FAC UNAVAILABLE TIME         = 00:02:18 HOURS
   FAC FAR-END AVAILABLE TIME   = 00:09:18 HOURS
   FAC FAR-END UNAVAILABLE TIME = 09:51:45 HOURS
   
   MEASUREMENT TYPE                 ERROR     ERROR
                                    COUNT     RATIO
   ----------------                 -----     -----
   
   ERRORED SECONDS                  11     0.03062%
   FAILED SECONDS                   138    0.38266%
   BURSTY ERRORED SECONDS           7      0.01941%
   SEVERELY ERRORED SECONDS         9      0.02496%
   FRAME SLIP SECONDS               6
   CARRIER FAILURES                 1
   FAR-END ERRORED SECONDS          2      0.35842%
   FAR-END FAILED SECONDS           35505 98.45271%
   FAR-END BURSTY ERRORED SECONDS   54     0.14974%
   FAR-END SEVERELY ERRORED SECONDS 35453 98.30852%
   DEGRADED MINUTES                 3
----------------------------------------------------------
Configuration for above test:
Telco (Lucent SS7) E1 line (crc4) <=> E100P + wct1xxp loaded ( *
stopped, T100P unmounted)
zaptel.conf: 
	span=1,0,0,ccs,hdb3,crc4 

If E1 line configured w/o crc4 - error count is 0.
Configuration for test w/o crc4:
Telco (Lucent SS7) E1 line (w/o crc4) <=> E100P + wct1xxp loaded ( *
stopped, T100P unmounted)
zaptel.conf: 
	span=1,0,0,ccs,hdb3
 

Buggy CRC calculation? (It's opinion of Telco's operator)
or my E100P is faulty?

Any ideas anyone?

Konrad