03-14-2007 02:59 AM - edited 03-05-2019 02:54 PM
Hi all, when we talk about e1 lines, are they basically an ISDN pri circuit?
03-14-2007 03:22 AM
Well E1 lines are also used for Hub to spoke serial lines. This used to be done pretty long time back.
HTH
Hoogen
Do rate if this helps :)
03-14-2007 03:25 AM
No, E-1 lines are the European Digital Standard level 1 lines. They are 2.048Mhz in speed. It is the media type that you speak about when you say E-1. The protocols that you run on an E-1 (as well as a T-1) can vary. ISDN, Frame Relay, HDLC, PPP, ATM, SMDS, etc, can all run on an E-1. The E-1 is Europes equivilant to the US T-1. The E-3 to the T-3. Hope I answered your question....Good Luck...
03-14-2007 06:21 AM
Hi Carl,
FWIW I've terminated a number of BT(UK) E1 lines as point-to-point 2Mbits/s bearers, using X.21 converters on the end of the 75 Ohm coaxes presented by BT, thence CAB-X21-MT cables to Sync interfaces on routers (in both bridging and routing scenarios). The trick with E1's is in the framing i.e. they present as ITU-T G.703 bearers but you can also order "fractional" E1 using G.704 framing to distribute the timeslots - thus acting as an ISDN PRI cct.
HTH, Andy.
03-14-2007 08:17 AM
so what do people normally order these as, If I want a point to point circuit would I just order a unchannelized 2 mbits circuit ?
03-14-2007 11:29 PM
Hi Carl
if you want a simple point to point circuit then go ahead for a channelized 2 Mbps circuit..
regds
03-15-2007 02:35 AM
Hi Carl,
Yes - sort of! Order a simple G.703 2Mbits/s(un-channelised) E1 if all you need is a 2Mbits/s point-to-point cct; else order same but with G.704 (channelised) framing if you want to use the timeslots. The presentation is either on unbalanced 75 Ohm BNC coaxes (Tx & Rx legs) or on balanced 120 Ohm twisted-pair RJ-45; the NTU's usually have both. I've attached a couple of .pdf's which may be of use.
Regards, Andy.
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