Hi Paulo, PM> This is our 2nd E1 client that we try to use crc4 either with the PM> e100p or with the e405p without luck.
PM> After some trials, we ask the telco to switch off crc4 on their side PM> and everything works flawlessly. [span=1,1,0,ccs,hdb3,crc4,yellow] looks good as it uses CRC4 and sets the timing to be synchronised with the clock coming in from your Telco's switch. You do not mention what sort of switch you are trying to connect to and what sort of physical cabling (including length) is used for connection to the Telco (Coax, baluns, 120 Ohm RJ45 etc.)??? On the occasions where CRC4 has proved to be a major problem from Asterisk to the Telco's switch, bad cable termination on the frame proved to be the problem and as soon as the connections were re-made properly CRC4 worked perfectly. I would also refer you to a recent comment from Critch who advised that Asterisk systems should be power cycled when changing CRC4 and timing settings for PRI. I agree with Critch _completely_; you must 'init 6' the system when you make PRI changes otherwise you will obtain false results and waste a lot of time. If the comments above do not help perhaps you could provide a bit more background information and then someone on the list will be able to assist. HTH Darren -- Comgate Telco>Internet<Broadcast +44(0)700 COMGATE -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Paulo Mannheimer Sent: 31 May 2004 17:08 To: [EMAIL PROTECTED] Subject: [Asterisk-Users] Crc4 issues Hi All, This is our 2nd E1 client that we try to use crc4 either with the e100p or with the e405p without luck. After some trials, we ask the telco to switch off crc4 on their side and everything works flawlessly. Is there anything in the crc4 calculation that may be broken? We took a look at wct1xxx.c and wct4xx.c but there doesn't seem to be much there to be fixed (apparently the crc4 calculation is done within the chip itself). We also took a look at http://lists.digium.com/pipermail/asterisk-cvs/2003-September/000126.htm l but couldn't figure out what bits should we try to set to test other card options. Is there any documentation on the card that could help us? Our zaptel looks like ... span=1,0,0,ccs,hdb3,crc4 bchan=1-15,17-31 dchan=16 We already tried ... span=1,1,0,ccs,hdb3,crc4 span=1,1,0,ccs,hdb3,crc4,yellow span=1,0,0,ccs,hdb3,crc4,yellow _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users _______________________________________________ Asterisk-Users mailing list [EMAIL PROTECTED] http://lists.digium.com/mailman/listinfo/asterisk-users To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
