RAD Data comm ASM-10/8 ,

ASM-10/8 Installation and Operation Manual Chapter 1. Introduction

09/10/00 16:26 Functional Description 1-7

Receiver The receiver comprises several circuits, as shown in the block diagram,

Figure 1-6.

• The receive filter removes all the out-of-band frequencies.

• The automatic equalizer comprises several equalizers which are activated

according to baud rate.

• The digital AGC automatically compensates for the attenuation of the

line.

The Remote Power Failure feature notifies the user at a central location of

a power failure in a remote modem.

The remote power failure feature can be configured only when the

ASM-10/8 standalone unit (remote) operates in conjunction with the

rack-mounted card ASM-10/8/R (central). When a power failure occurs,

ASM-10/8 standalone unit transmits a special tone, which is detected by

the ASM-10/8/R and causes the RPF LED to turn on. A special push button

– RPF – located on the front panel of ASM-10/8/R, allows the user to reset

the RPF LED. The RPF jumper in the standalone unit enables or disables

the feature. RPF should be disabled for multipoint applications.

V.54 Diagnostics ASM-10/8 features V.54 diagnostic capabilities for performing local analog

loopback and local and remote digital loopback. When the modem is set

to the digital loopback mode, the operator at either end of the line can test

both modems and the line. The loopback is controlled either with

front-panel push buttons or via pin 18 and pin 21 of the V.24/RS-232

interface.

A selectable option allows insertion of a delay into the data stream so that

the V.54 loops are not carried across the network.

A selectable option allows insertion of a delay into the data stream so that

the V.54 loops are not carried across the network. The delay prevents the

last modem from receiving the complete V.54 data sequence and, in turn,

being induced into the loop. V.54 delay is required only when operating in

synchronous mode.