We often get asked by our customers what the difference is between a WIC-1DSU-T1 and a WIC-1DSU-T1-V2 T1 Wan Interface Card for Cisco routers.
Apart from price (as of this writing, the WIC-1DSU-T1-V2 is the more expensive of the two) the WIC-1DSU-T1-V2 offers all of the same features of the WIC-1DSU-T1. Cisco describes the WIC-1DSU-T1-V2 as an "updated" version of the older WIC-1DSU-T1 (which has been officially End-Of-Lifed).
But what exactly does "updated" mean to you. The following is a table showing the differences which do not affect most installations.
WIC-DSU-T1
One-port T1/fractional T1 DSU/CSU WIC
Supported on: 1600(2) , 1600R(2), 1700(3) , 2600, 2600XM, 3600, and 3700
Wet T1 Capable: No
Short Cable Length Command: No
Network Equipment Building Standards (NEBS): No
WIC-1DSU-T1-V2
Updated one-port T1/fractional T1 DSU/CSU WIC
Supported on: 1700(1) (1720, 1721, 1751, 1760), 2600XMs, 2691, 3631, 3725, 3745, and ICS 7750
Wet T1 Capable: Yes
Short Cable Length Command: Yes; used to configure attenuation for short cable lengths (<660 feet)
Network Equipment Building Standards (NEBS): Yes (Type I/III)
NOTE: The Cisco 1750 Router does not support the newer version, WIC-1DSU-T1-V2
