Description
68P81096E36-H
9
06/28/05
Wireline Interface Board Operation
Introduction
The Wireline Interface Board (WIB) serves as the interface between the customer an-
alog telephone lines and the serial data signals of the station. WIBs are offered to
handle 2-wire, 4-wire and 8-wire configurations. In general, the WIB processes and
routes all wireline audio signals between the station and the landline equipment
(such as consoles, modems, etc.). Landline-to-station and station-to-landline audio
signals are connected to the WIB via copper pairs at the rear of the station.
Wireline Interface Board Operation
The WIB contains a PCM Codec-filter device to perform the audio digitization and re-
construction, as well as the band-limiting and smoothing required by PCM systems.
Analog signals are routed as follows:
-
Inbound analog signals are converted to digital signals and routed to the SCM
as wireline transmit data (WL TxD).
-
Outbound PCM data signals are converted to analog signals and routed to the
Line 2 output.
-
A latch receives control signals from the SCM (via the SPI bus) to control the gat-
ing of the audio signals.
For a list of the actual features supported, refer to the “Summary of Operating Fea-
tures” on page 3, or the MTR2000 System Planner.
Note
