Software provisionable E&M and PLR modes (2-wire or 4-wire) and software provisionable Tandem and DX modes (4-wire only). Provisionable transmit and receive gain and provisionable bias (switched or fixed — DX mode only).
The E&M plug-in card can provide either 2- or 4-wire service. It can only provide 4-wire service when provisioned in the Tandem or DX modes. The E&M plug-in card has a fixed impedance of 600 ohms. Voice frequency gain is provisionable in 0.1 dB increments.
This special services card has expanded functionality with additional support for equalization and signaling, and is fully GR-57 compatible. The primary application for the E&M card is interoffice trunking from a PBX to a switch.
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