[c-nsp] VWIC2-1MFT-G703

[Lauri Turunen]

On 24.8.2010 16:39, Andrew Gabriel wrote:
> Hi,
>
> We are deploying a bunch of E1s across Asia and EMEA, and were told by
> our provider that for the sites that are G.703 they would recommend
> the VWIC2-1MFT-G703 card rather than the regular channelized E1 cards.
>
> Most of the E1 links G.703 connectivity I have seen typically work
> fine with the VWIC2-2MFT-T1/E1 type card.
>
> So would the VWIC2-2MFT-T1/E1 work for any E1 link, or do we really
> need to buy the VWIC2-1MFT-G703 card that is more expensive and
> difficult to source?
>
> Thanks,
> -Andrew.
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Hello,

VWIC2-(1|2)MFT-G703 is more expensive probably because it provides both 
G.703 (unstructured) and G.704 (unstructurized) services. E1 means G.704 
which steals one timeslot 0 for synchronization purposes providing 64kb 
less capacity than an unstructured G.703 (2,048kbps and 1,984kbps 
respectively). And of course with E1 you can provide 64kb timeslots & 
voice services

So VWIC2-2MFT-T1/E1 is only capable of structured service. It depends on 
your provider what they are willing to provide. If they provide G.704, 
it doesen't matter which card you have. The cheaper, the better, aye?

Btw, if you are going to have two E1s one one card, remember to take 
into account the clocking independence from different lines. If 
secondary port syncs to the primary port and the lines happen to have 
different clocking, the second line will experience slips. Thats one 
nasty thing to forget to take into account :-)

Regards,
/Lauri