I don't know what a 2662 is but to the transcoders, ...
There's a number of ways to go. You can use an NM-HDV module with DSP's in it as transcoders using newer 12.2 code, you can use an MRP blade on an ICS7750, or a Cat6608 blade. If you've already got a PRI up using Cisco hardware, you can probably add DSPs to the module or card and use them as a transcoder. Sharing of DSP resources is allowed using newer 12.2 code.
For sure, any of the following would work (this module goes into 2600/3600/3700 type routers)
NM-HDV-FARM-C36
NM-HDV-FARM-C36=
NM-HDV-FARM-C54
NM-HDV-FARM-C54=
NM-HDV-FARM-C90
NM-HDV-FARM-C90=
If you've got a 6000, use the WS-6608T1
