This question seems to come up many times and getting conflicting answers. if a CE router needs to talk to a PE router to reach MPLS network on E1 Port. The local loop is delivered as G.703 unframed. However PE will not configure as unframed. PE will configure as timeslot 1-31 for a framed E1 1984k even though the loop is G.703 unframed 2048k.
Question is, does the CE must use the more expensive G703 version of VWIC2 or can CE use the cheaper VWIC2-1MFT-T1/E1 instead?
My assumption is that even though the loop is unframed, however, CE and PE are not talking unframed. So I believe I can use the cheaper T1/E1 card on the CE and configure the card type as E1 and then configure "timeslot 1-31" under the controller even the loop is unframed G.703 2048k. The goal is to have the CE can talk to PE and since PE will not do unframed, then, no reason to do unframed on CE side which may not even work since PE is configure as timeslot anyway.
So the real doubt is just that does CE and PE need to "match" the loop "unframed" at all? Can CE and PE just ignore the loop being unframed and configure CE and PE as timeslot over this unframed loop?
I know I can use the G.703 card and then configure it as timeslot and it will work 100%. However, g.703 version is more expensive compared to T1/E1 version so the cheaper card will work anyway, then why would I buy the more expensive one.
As mentioned above.
If the circuit is framed, two regular E1 cards will work.
If is is unframed, ditto.
Both ends of a circuit "create" framing, each one in it's transmit direction.
What you've been told is wrong and is a classic mistake of people unfamiliar with E1. They haven't even read the standards that says ALL E1s are G.703. And T1 also, and E3 and T3 BTW.
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