The second-generation 1- and 2-port T1/E1 multiflex trunk voice/WAN interface cards have the following key features:
* Full support for T1 Facility Data Link (FDL). * Controller local loopbacks. * Controller remote loopbacks. * RFC 1406 and integrated CSU/DSU MIB. * MIB and Simple Network Management Protocol (SNMP) management. * Firmware to support T1 and E1 Layer 1 homologation. * User-initiated VWIC reset and field-programmable gate array (FPGA) download. * Voice support (includes DS0-group and PRI-group configuration).