TEW4921 is designed and approved to be used as a transmit transformer with the Mitel MT89760/-60B and MT89790/-90B devices in T1 and CEPT applications.
Complies with ANSI T1.408 and CCITT I.431., with regards to Longitudinal Balance.
TEW4921-2 is designed for MT89790B when operating from a single 5 Vdc supply.

Typical applications are:
• Primary rate ISDN network nodes.
• PBX or computer to T1/CEPT Digital Trunks.
• TDM Multiplexers.