Tellabs E&M Special Services (E&M) Plug-in Card

E&M Special Services (E&M) Plug-in Card
Interoffice trunking from a PBX to a switch

The Tellabs 1000 MSAP E-lead and M-lead signaling (E&M) plug-in card is a special services channel unit. The E&M card supports one subscriber line circuit for E&M types I, II, III, IV and V and two subscriber line circuits configured for operation in E&M types I or V. The special services plug-in card also supports DX signaling (switched or fixed bias) and can provide subscriber line circuits for Tandem modes I and II (switch and station side) and Pulse Link Repeater (PLR) types I and II.

Flexible
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.

Many uses
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.

Software provisionable
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).

• End-to-end compatibility with existing cards in the field
• Two circuits per card, each able to support different provisioning
• Software-provisionable E&M and PLR modes (2-wire or 4-wire)
• Provides one or two E&M circuits per card, depending on modes: E&M Type I, II, III, IV, V and PLR I and II
• Software-provisionable Tandem and DX modes (4-wire only)
• Provisionable transmit and receive gain
• Provisionable bias (switched or fixed: DX mode only)
• Post-equalization
• 600 ohms and 1200 ohms fixed impedances
• Normal and reverse DX signaling

Please refer to Data Sheet for complete specifications.