command ds0-group vs pri-group and E1 ISDN PRI vs E1 CCS

[JERRI -]

hi all,

When I using E1 ISDN PRI on my gateway, what should i use in controller interface

ds0-group

or

 pri-group ?

What I know, that for ds0-group, is for E1 / T1 CAS, pri-group is for E1 /T1 isdn pri.

is it correct?

and, are it the same for E1 ISDN PRI  with E1 CCS?

thanks,

Jerri

[Ayodeji Okanlawon · Accepted solution]

Yes Jerri, you are correct. Use pri-group for E1/T1 ISDN.

[JERRI -]

Hi Ayodeji,

Thanks for the respond.

and, are it the same for E1 ISDN PRI  with E1 CCS?

[Ayodeji Okanlawon · Accepted solution]

CCS is called common channel signalling. This is what ISDN uses. It uses a single channel called the D channel to carry the signalling for the whole circuit. CAS (channel associated signalling) carries signalling information in the bearer channel.

So yes E1 ISDN PRI uses CCS

[JERRI -]

Hi Ayodeji,

One more question,

why in E1 CAS,

the command for timeslot is

ds0-group timeslot  1-15,17-31 type xxx?

as we know that, CAS, using robbed bit signaling.

why not

ds0-group timeslot  1-31 type xxx for the CAS?

and,

as far as I know, timeslot 1st for framing, why timeslot 1st, included in

ds0-group command

Thanks,

Jerri

[Ayodeji Okanlawon]

Jerri,

E1 CAS is not my forte! I know almost nothing about it. You can check online to see if you find answers to this..

[JERRI -]

Hi Ayodeji,

One more question,

why in E1 CAS,

the command for timeslot is

ds0-group timeslot  1-15,17-31 type xxx?

as we know that, CAS, using robbed bit signaling.

why not / what is the different between

ds0-group timeslot  1-31 type xxx for the E1 CAS?

and,

as far as I know, timeslot 1st for framing, why timeslot 1st, included in

ds0-group command

Thanks,

Jerri