I'm not positive if a single NM can take 2 WIC-2Ts, but the WIC-2T is not supported in any of the following NMs:
NM- 1E2W, NM- 1E1R2W, and NM-2E2W.
You would require at least an NM with the FE port (i.e. NM-2FE2W) or an NM-2W.
Our documentation says that a single WIC-2T can:
"WIC-2T Sync support with a max speed of 2.048 Mbps
- Supports one port at 8 Mbps when used in NM-1FE1R2W, NM-1FE2W, NM-2FE2W, or NM-2W or 2600 chassis WIC slots. All other WIC ports on that network module or 2600 chassis must not be used.
- Supports two ports at 4 Mbps each when used in NM-1FE1R2W, NM-1FE2W, NM-2FE2W, or NM-2W or 2600 chassis WIC slots. All other WIC ports on that network module or 2600 chassis must not be used. "
This leads me to believe that the NMs listed above can support 8Mbps full duplex, which would be equivalent to 4 x 2Mbps = 4 E1s. So, looks like the hardware can support it, but I'm not sure if this is the "official Cisco answer."
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