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14.4 kbps. The Express 5200 dynamically allocates bandwidth to
voice and data applications. This results in all bandwidth being
available for data applications in the absence of voice or fax.
FXS Module
The FXS module provides two 2-wire compressed voice interfaces
and serves as the source of line current and ringing voltage. The
FXS serves as the station side of a foreign exchange FXS/FXO
application. The FXS may also be paired with another FXS to
provide private line automatic ringdown (PLAR) function across
the WAN.
FXO Module
The FXO module provides two 2-wire compressed voice interfaces
and provides a load for line current. The module includes a ring
detector and a line current detector. The FXO serves as the office
side of a foreign exchange FXS/FXO application.
E&M Module
The E&M module provides two 2- or 4-wire compressed voice
interfaces for use in E&M applications.
Dial Backup Operation
The Express 5200 supports dial backup of point-to-point DDS
circuits or point-to-point frame relay circuits. For DDS backup, the
Express 5200 enters dial backup based on physical line faults.
During dial backup, the Express 5200 monitors the main line
integrity and drops the dial backup call when the main line is
restored.
For frame relay dial backup, the Express 5200 monitors the physical
line condition as well as the signaling state of the frame relay
circuit. A loss of signaling on either end of the circuit causes the
Express 5200 to enter dial backup. During dial backup, the
Express 5200 constantly monitors the physical state of the network.
It also attempts to re-establish signaling on the main line. Once
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Express 5200 User Manual
Chapter 1. Introduction
1-5
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