Hi,

Check this out:

-The Cisco 1- and 2- port G.703 MFT VWIC2 versions act as a WIC, supporting T1, fractional T1, E1 (including structured G.703 with G.704 framing), fractional E1, and unstructured E1 (G.703) applications. To simplify remote management, the G.703 version includes a fully managed DSU. The G.703 versions also support all the capabilities on the T1/E1 versions.

http://www.cisco.com/en/US/products/ps5855/products_data_sheet0900aecd8028d2db.html

NOTE: It supports E1 configurations for both balanced and unbalanced modes

HTH, please rate if it does help,

Mohammed Mahmoud.