TDM (E1) Transmition over 3 Links back to back
direct link might be more than 160 km distance so we have no choice but to use to Hop sites as a Relay point to get there. all the 3 links are installed there some months ago and are transferring some data traffic around 20 Mbps back to back now but as we have to answer the customer just wanted to make sure that we could transfer TDM from one point to another one over 3 links? in the Relay Points there is no add/drop for traffic and just the IDUs will be connected to each other back to back. so there are 2 issues :
# 1 is about the compatibility between Giga IDU and Giga PLUS IDU and # 2 is if the links can handle TDM traffic over hops to the final destination.
MultiHop TDM Transmition.pdf
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Assuming the individual links are engineered accordingly there is no problem repeating the T1. Just use a crossover cable between the IDUs. There is also no problem mixing Giga and GigaPlus among the individual links. You cannot link a Giga to a GigaPlus, however, in the same link (but they can be collocated together.)
If you want to mange the radios via out of band management, you'll need a switch at each location, or need to disable smart mode. Alternatively, you could use IBM to manage the radios along the path.
I know of many deployments have done two hops and I'm fairly certain there are a few that have done three hops as well without a problem. Actually, I've tested in my lab with 14+ hops and no problems.
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