From: robbie (robbie@packetized.org)
Date: Fri Jun 24 2005 - 08:46:21 GMT-3
On a Channelized E1 module, is it always necessary to use one channel
for signalling, or can you actually use all 32 channels (plus in-band
signalling) for data transport? I seem to remember something about
timeslot 0 (or was it 16?) always being reserved because you couldn't
use robbed-bit in E-carrier transport.
Cheers,
Robbie
Keane, James wrote:
> You can use a channelised E1 controller for PRI isdn or Channelised 2mb
>
> Here is the PRI
>
> --------------------------------------------------------------------------------
>
> ISDN Se4/0:15, Channel [1-31]
> Configured Isdn Interface (dsl) 0
> Channel State (0=Idle 1=Proposed 2=Busy 3=Reserved 4=Restart 5=Maint_Pend)
> Channel : 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
> State : 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
>
> 30 X 64 for calls
> 1 X 64 for D Channel (usable by customer)
>
> 1 for Signalling (unusable by customer)
>
> 1920 + 64 + 64 = 2048
> --------------------------------------------------------------------------------
>
> Now the EI Channelised controller (same hardware)
>
> E1 2/1 is up.
> Applique type is Channelized E1 - balanced
> Description: Channelised Circuit -
> No alarms detected.
> Framing is CRC4, Line Code is HDB3, Clock Source is Line.
> controller E1 2/1
> channel-group 0 timeslots 1-31
>
> Here we have 31 different usable channels (and one unusable 64k signalling)
>
> thats 1984 + 64 = 2048
> --------------------------------------------------------------------------------
>
> Regards
>
> James
>
> -----Original Message-----
> From: robbie [mailto:robbie@packetized.org]
> Sent: 24 June 2005 01:17
> To: Group Study
> Subject: Re: bandwidth of e1
>
>
> Allow me to revise and extend - I mistyped 30 instead of 32.
>
> ISDN PRI on E1 is 30 B-Channels plus 2 D-channels for signalling.
>
> -------- Original Message --------
> From: - Thu Jun 23 19:14:44 2005
> X-Mozilla-Status: 0001
> X-Mozilla-Status2: 00800000
> Date: Thu, 23 Jun 2005 19:14:43 -0500
> From: robbie <robbie@packetized.org>
> Reply-To: robbie@packetized.org
>
>
> E1 bandwidth is 30 channels (as opposed to 24 channels on a T1/J1) of
> either 56kbps or 64kbps (usually 64kbps these days), making it 2.048Mbps.
>
> John Matus wrote:
>
>>is the bandwidth of E1 2.048 mbs...? or is it doube a T1 @ 3.088?
>>
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>
>
-- robbie at packetized dot org <short sig army - one line sigs since 1993>
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