[c-nsp] Channelized DS3 over SM fiber handoff

[Michael Ulitskiy]

Hello,

We will need to terminate channelized DS3 circuit in 7200VXR router. 
The problem is that DS3 is given to us by telco (Verizon) as a single-mode fiber.
I have no experience with this kind of setup and actually limited experience with DS3 circuits.
Has anybody done this before? How it's usually done?
Is there a DS3 PA with fiber interface for 7200 routers (I don't see any) or I should use
a media converter with PA-MC-T3? If so, can you recommend one?
It seems that many media converters use proprietary DS3 encoding scheme and must be used in pairs
(or at least I've been told so), but telco is unable to give us any recommendation on how
we should terminate it on our end. 
If anyone could share the experience on terminating DS3 over fiber handoff from Verizon, East Coast,
I'd greatly appreciate it. Any pointers to appropriate documentation/tutorials/howtos/etc are also very welcome.
Thanks a lot,

Michael