The handoff is an ATT control mux (not a csu) that has been equipped with
a BNC port (not hssi). The NM-1A-T3 card married up well, however ATT wants
a PPP interface and not an ATM interface. ATT suggested a PA-T3 card, however that's for the 7206 and not the installed 3640. One reseller is suggesting the NM-1HSSI card with this adapter cable, and I'm 99.999% sure
(no matter what the reseller says) that a passive hssi-to-bnc cable isn't going
to support the clock and other interface signals required by the hssi card. But,
didn't want to inject (another) personal opinion and further confuse the
I think you are bound to the fact that the modules for the 3600 at those speeds are only HSSI and not BNC. I can think of two things here.
#1. Can ATT swap out the MUX with one that has a HSSI interface to the router?
#2. If you did use the HSSI-to-BNC cable, why wouldn't the signalling work? An electric charge on a wire is an electric charge. As long as the cable was smart enough to know how the pinouts and conversions work, then it should suffice. Otherwise, I cannot imagine why anyone would make such a cable if it didn't work at layer 1. Given that I have never used such a cable could result in me being absolutely wrong too!
When we put up our ds3 to the internet the provider said the 3640 couldnt handle it, even though it had the interfaces. I cannot remember the details but cisco agreed that it would not work at full ds3 speed.
The only problem is that they do not list the 3640 as a supported platform. Which indicates that your customer needs to upgrade the router inorder to provide this connectivity. I did notice a couple of high end 2600's listed in the supported platform area.
One additional note, if you change providers and you don't need the control mux in the future, you can connect your DS3 coax directly into the network module. It gives you a little flexability for future configurations.
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