Power Supply Unit (P/N 1175006L2); Echo Canceller With Adpcm (P/N 1203384L2); Nx56/64K (V.35) Module (P/N 1200372L1); Quad Fxs Access Module (P/N 1175408L2) - ADTRAN Total Access 850 System Manual

Section 1 System Description
built-in Echo Cancellation for up to 24 voice ports. Adaptive Differential Pulse Code Modulation
(ADPCM) resources are also built-in for up to 16 ports.

Power Supply Unit (P/N 1175006L2)

The Total Access 850 PSU is a common module plug-in unit designed to supply power to the system. The
faceplate contains a momentary ACO pushbutton, a ring voltage Enable/Disable pushbutton, a Bank Alarm
LED, Ring LED, and a power LED. All power, ground, and timing signals are pre-wired, thus eliminating
additional wiring requirements.

Echo Canceller with ADPCM (P/N 1203384L2)

An Echo Canceller Module is available for use with the legacy T1 RCU (P/N 1200376L1 - ATM firmware
only). Echo cancellation and ADPCM resources are built into the 3rd Generation T1 (P/N 1203376L1) and
SDSL (P/N 1200 377Lx) versions of the RCU, so this module is not required when using the SDSL RCU.
The Echo Canceller Module provides G.168 echo cancellation for voice over ATM applications and
includes Adaptive Differential Pulse Code Modulation (ADPCM). ADPCM is a speech coding method
which uses fewer bits than traditional Pulse Code Modulation (PCM), allowing the user to get more analog
voice calls on less bandwidth. This is a dual-slot module and must be installed in the system resource slots
(A and B).
The Echo Canceller module ADPCM functionality automatically shifts ON/OFF when fax
or modem calls are placed. To find out the current status of the Echo Canceller
functionality, check the current status of each FXS port. The path of the current status can
be found at the following path:
> P
ROTOCOL
ADPCM).

Nx56/64K (V.35) Module (P/N 1200372L1)

This module is only available in Total Access 850 systems using a BCU. The Nx56/64k (V.35) Module
activates the V.35 port on the rear of the chassis. This is a dual-slot module and must be installed in the
system resource slots (A and B).

Quad FXS Access Module (P/N 1175408L2)

The Quad FXS Module provides analog voice extension for the Total Access 850 platform. Four analog
voice ports are used to connect to analog phones. The Quad FXS Module supports Foreign Exchange
Subscriber, Dial Pulse Terminate (DPT), and Private Line Automatic Ringdown (PLAR) and provides
Ground Start/Loop Start to E&M conversion capability.

Quad FXO Access Module (P/N 1175407L2)

The Foreign Exchange Office (FXO) module interfaces to the Central Office switch and to an FXS or
RPOTS card over a T1 facility. Four analog voice ports on the FXO access module provide four individual
connections to the switch. The FXO supports standard Loop Start and Ground Start options as well as Dial
Pulse Terminate (DPT) functionality. Up to six Quad FXO Access Modules may be installed in the Total
Access 850.
20
L2 P
ROTOCOL
S > POTS S
TATUS TATS
© 2004 ADTRAN, Inc.
Total Access 850 System Manual
(T1 ATM–T1–ATM) > S
(this will display either PCM or
> C T
ODING YPE
> PVC S
TATUS TATUS
64203376L1-1B