Cisco ONS 15454 SDH

Answered Question
Feb 21st, 2008

Hi,

i have 3 sites connecting together with SDH 15454 site A-B with STM-1 and from site B-C STM-16,i want to Aggregated hand-off E1's from Site A-C so site B will be trasparet site for this link.

to be source of link on site A and Drop on site C.

any help to achive this.

there is already cricte between site B-C.

I have this problem too.
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Correct Answer by Tom Randstrom about 8 years 9 months ago

You will need to verify that the cross-connect card in the ONS 15454 (sites B & C) have VC-12 grooming capabilities (XC-VXL and CX-VXC will support VC-12 grooming).

The ONS is designed to groom lower rate signals to higher rate speed lines. Thus, you should be able to aggregate the E1s from the ISPs STM1 with the E1s from Site B and drop them at Site C.

You will need to add an STM1 card(s) to Site B. Your ISP will need to provide the mapping structure of the STM1, so you can understand where the VC-12s, which contain the E1s, are located in the payload. You will then create circuits to map each E1 (the incoming VC-12s within VC3/VC4) from you ISPs STM1 at Site B, to the appropriate VC-12 on the outgoing STM16 line heading toward Site C. At Site C, you will need to map the VC-12s on the STM16 line to the appropriate port on an E1 line card.

I hope this helps. Otherwise, you will need to have someone locally assist you in the explanation.

Tom

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Tom Randstrom Fri, 02/22/2008 - 06:49

Is there any traffic already provisioned on the STM1 link between Sites A & B? How much bandwidth is currently available on the STM16 link between Site B & C? This will determine if bandwidth is available to add the new E1 services or upgrade the current optical interfaces to higher speed STM-x interfaces.

Once bandwidth is available on your links, you should be able to add the 15454E-E1-42 card (s) to Site A, mapping them to available timeslots (VC-12s into VC-3/VC-4s) between sites A & B and B & C. The E1s can be terminated at Site C or passed though on an STM-x interface to other equipment. Site B would not terminate the E1s but cross-connect them electrically through to the next link. No equipment should be required at Site B.

Hope this helps.

Tom

malaradi83 Sat, 02/23/2008 - 22:25

Thank you Tom for your reply,

There is not traffic on this link between site A-B,BW for STM-16 is 2.488 Gbps and this link still have available BW to curry new E1's.

what we want to do is 2 site's B-C already connected now and under our control,site A is another ISP and provide us with STM-1 to

connect us with inter brach's.

so what is our problem is how we will Aggregated hand-off between E1s from site A which is not under control and site C which is our end Branch and it's under control.

please check the attached.

thank you for your support.

Attachment: 
Correct Answer
Tom Randstrom Sat, 02/23/2008 - 23:27

You will need to verify that the cross-connect card in the ONS 15454 (sites B & C) have VC-12 grooming capabilities (XC-VXL and CX-VXC will support VC-12 grooming).

The ONS is designed to groom lower rate signals to higher rate speed lines. Thus, you should be able to aggregate the E1s from the ISPs STM1 with the E1s from Site B and drop them at Site C.

You will need to add an STM1 card(s) to Site B. Your ISP will need to provide the mapping structure of the STM1, so you can understand where the VC-12s, which contain the E1s, are located in the payload. You will then create circuits to map each E1 (the incoming VC-12s within VC3/VC4) from you ISPs STM1 at Site B, to the appropriate VC-12 on the outgoing STM16 line heading toward Site C. At Site C, you will need to map the VC-12s on the STM16 line to the appropriate port on an E1 line card.

I hope this helps. Otherwise, you will need to have someone locally assist you in the explanation.

Tom

malaradi83 Mon, 06/09/2008 - 13:53

Tom,

thank you for your support we fix this problem by checking with our privider E1's map on STM-1 link.

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