[Asterisk-Users] E1/T1 configurations

[Steve Underwood]

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
>  
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>>the following questions and assumptions, would the configurations
>>    
>>
>below
>  
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>>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.
>>    
>>
>
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>Not all E1 providers have crc4 turned on.
>  
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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