Re: [Asterisk-Users] E1/T1 configurations

Thu, 08 Dec 2005 07:46:03 -0800 

Steve Totaro wrote:


Hi,
        If you were to lead someone (with a UI) through the process of
configuring a a Digium T1/E1 card with asterisk and a T1/E1 trunk from

a

provider, would the following questions cover most scenarios? i.e.

given

the following questions and assumptions, would the configurations

below

work for most people?

 - Is it a E1 or T1 line (i.e. are you in Europe or America)?

 - If it's a T1 line, is it PRI ISDN or E&M?

 - If it's a T1 does it use Extended Super Frame (ESF/D5) framing or
   is it Super Frame (SF/D4) framing?

 - If it's an E1, does it use High-density Bipolar-3 (HDB3) or
   Automatic Mark Inversion (AMI) coding?


        And given the following assumptions:

 - If it's an E1 voice line, it's going to be PRI which implies CCS
   framing

 - ESF framing on a T1 generally implies B8ZS coding and SF implies
   AMI coding

 - If it's a T1 PRI, it's most likely a National 2 switch; if it's an
   E1 PRI, it's EuroISDN

 - 0db LBO in most cases

 - Most E1 lines use a crc

 - Wink start is usually used with E&M signalling


        You'd then have have a set of configurations like:

 - T1, PRI, ESF

     zaptel.conf:

       span=1,1,0,esf,b8zs
       bchan=1-23
       dchan=24

     zapata.conf:

       switchtype=national
       signalling=pri_cpe
       context=incoming
       group=1
       channel=>1-23

 - T1, PRI, SF

     zaptel.conf:

       span=1,1,0,d4,ami
       bchan=1-23
       dchan=24

     zapata.conf:

       switchtype=national
       signalling=pri_cpe
       context=incoming
       group=1
       channel=>1-23

 - E1, PRI, HDB3

     zaptel.conf:

       span=1,1,0,ccs,hdb3,crc4
       bchan=1-15
       dchan=16
       bchan=17-31

     zapata.conf:

       switchtype=euroisdn
       signalling=pri_cpe
       context=incoming
       group=1
       channel=>1-23

 - E1, PRI, AMI

     zaptel.conf:

       span=1,1,0,ccs,ami,crc4
       bchan=1-15
       dchan=16
       bchan=17-31

     zapata.conf:

       switchtype=euroisdn
       signalling=pri_cpe
       context=incoming
       group=1
       channel=>1-23

 - T1, E&M, ESF

     zaptel.conf:

       span=1,1,0,esf,b8zs
       e&m=1-24

     zapata.conf:

       signalling=em_w
       context=incoming
       group=1
       channel=>1-24

 - T1, E&M, SF

     zaptel.conf:

       span=1,1,0,d4,ami
       e&m=1-24

     zapata.conf:

       signalling=em_w
       context=incoming
       group=1
       channel=>1-24

Thanks,
Mark.



Not all E1 providers have crc4 turned on.
Except for ISDN lines, E1s hardly ever have CRC4 turned on. As you said, some countries don't even turn it on for ISDN, which is stupid. 

Regards,
Steve

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