Channelized STM-1/OC3 Card Configuration

Unanswered Question
Aug 12th, 2010

Hi,

I have recently purchased a Channelized STM-1/OC3 SPA card for my 7600 router. framing is SDH and I need to use au-4 as my AUG mapping. Mux is mapping my first two tug-3 to a customer. Can I have these two tug-3 bundled into one serial interface? If can't what's the minimum number of serial interfaces that I can get?

I checked the configuration guide but couldn't find a good description....

Thx

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Overall Rating: 3 (1 ratings)
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zdesve33 Thu, 08/12/2010 - 02:22

hi,

the basic container is C-12, so the basic logical channel is E1. You can use up to DS0 (64k) channel. So if you can higher speed than E1, you must use m-ppp or m-fr and group logical serial together on L2.

Z.

sudeera_mit Thu, 08/12/2010 - 02:48

correct. but with following configuration we can use it in E3.

controller sonet 3/0/0

framing sdh

aug mapping au-4

au-4 1 aug-3 1

  mode {c-12 | e3 }
!

If you specify the mode as c-12, you can configure E1s. If you specify the mode as e3, you can configure E3.

zdesve33 Thu, 08/12/2010 - 04:13

my fault, i am using chstm1 pa in c7200 and this pa doesnot support e3. But back to your question - you cannot bundle e3 together, simmilary you cannot bundle e1 together on L1. You must use L2.

Z.

zdesve33 Thu, 08/12/2010 - 08:00

yes, of course. this is what we discuss - you have to use L2 (PPP,FR), you cannot group logical channels (e1/3) on L1. E1 (in mode c-12), resp. E3 (in mode e3) is the base rate and cannot be grouped to build higher rate, it is not in SONET or SDH standard.

Chetan Kumar Ress Thu, 08/12/2010 - 09:58

Hi

Yes you are correct !!

The Virtual Container should contain the same rate . We can't build container that have different base rates.

The container is an identification the base rates & it should be always same as per standards.

So we need to use L2 to make a bundle of multiple E1

Regards

Chetan Kumar

http://chetanress.blogspot.com

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