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Silver

Connecting two Routers back to back

Is it possible to connect 2 Routers Back to back using HSSI using CAB=HSI1 instead of CAB=HNUL. The Interface card on each router is a PA-H. Any body has any ideas ?

4 REPLIES
New Member

Re: Connecting two Routers back to back

Look at the instructions on the following link. They may be of help to you.

http://www.cisco.com/univercd/cc/td/doc/product/core/cis7505/portadpt/hssi_pa/pa-2h/3501inst.htm

Go under the section "connecting PA-2H interface cables"

Silver

Re: Connecting two Routers back to back

Thanks for the link. I have already gone through that. But I need to connect back to back using the HSSI cables and not the NULL modem. Wondering if it is possible.

New Member

Re: Connecting two Routers back to back

The only way I can think of is through an adapter. You might try companies such as these

http://hd.nl/printable_list.php?cat_id=2152

I have heard of people using an adapter so they could connect an older router to newer equipment. What model are the routers?? How will you be using them?

New Member

Re: Connecting two Routers back to back

You cannot use that cable since the pin outs are completely different than whats needed to connect two routers directly. A null modem cable is bascially a cross-over cable for hssi, and the hsi1 is basically a straight-through.

The only option I can think of is to use 2 ds3 csu/dsu's and connect them back to back ( make sure to reverse the tx and rx on one ).

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