2014年3月4日星期二

Channelized vs clear channel E1

I understand a HWIC-1T    pure G.703 means clear channel = 2048kbps = unstructured E1 = unchannelized E1.

And a G.703/G.704 means a channelized E1 = 1984kbps = for data it can use timeslow 1-31 for data and TS0 is reserved for framing for G.704.

If the above two description are correct, then I assume there is no such thing "Channelized clear channel 1984k", is that correct? Someone told me about this term and I can't make sense out of this of what that means as I thought "channelized" and "clear channel" are mutually exclusive in an E1 data ckt perspective.  Please correct me if this is wrong.

Now question onto the router:

If PTT delivers a 1984k E1, I will assume this mean I can use VWIC-1MFT-E1 module to connect to this handoff.  And then I can configure:

Controller E1 0/0/0
channel-group 0 timeslots 1-31

So now I have a data ckt with 1984k bandwidth talking to the other side with similar config.

Question is what about if PTT deliver a clear channel 2048k ckt to me but I have no reason or need to use 2048k.  I just need 1984k as I am connecting my router (CE) to a provider PE for MPLS VPN for a 1984k E1 Port speed.

So if somehow the PTT loop is 2048k to me and to provider (PTT is not same provider as MPLS provider).  And if I really need 1984k instead,

a) first of all, can my VWIC-1MFT-E1 card still work on this clear channel handoff even though I really only need 1984k with timeslot 1-31?

b) if (a) is negative, so does that mean even if I just need 1984k, I still need to use VWIC-1MFT-G703 interface card?

c) If (b) is correct, then should I still configure

Controller E1 0/0/0
channel-group 0 timeslots 1-31

or should I need to configure

Controller E1 0/0/0
channel-group 0 timeslots unframed

I mean I don't want clear channel as Provider is doing 1984k for MPLS Port.  So my question really is can we still do the timeslot 1-31 on an clear channel loop?

You've got an answer from an inexperienced representative, that doesn't fully understand how E1 works. This is typical especially in the WS-X45-SUP7L-E   USA TAC.

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