Chapter 1. Introduction ASM-10/8
Installation and Operation Manual
1-4 Overview 09/10/00 16:26
ASM-10/8 communicates over lines in synchronous mode only. When set to
the asynchronous mode, ASM-10/8 performs an asynchronous to
synchronous conversion in compliance with ITU V.14 bis standard.
The unit has line protection circuits against lightning and power surges.
ASM-10/8 V.54 diagnostic capabilities include:
• Local digital loopback (DIG), activated by the front-panel push button
• Remote digital loopback (REM), activated by the front-panel push button
or DTE interface signal, pin 21
• Local analog loopback (ANA), activated by the front-panel push button or
DTE interface signal, pin 18.
ASM-10/8 also operates in conjunction with the MCS-10 dual modem card
of the MCS-12 Monitoring and Control System.
The ASM-10/8/R card is capable of sensing and indicating power failure on
the remote ASM-10/8 standalone unit. When this feature is enabled, the
RPF LED lights in case of a remote power failure.
Transmission Range
Table 1-1 lists the ASM-10/8 approximate transmit ranges over 19, 24 or
26 gauge wires.
Table 1-1 ASM-10/8 Transmission Ranges
Speed 19 AWG
(0.9 mm)
24 AWG
(0.5 mm)
26 AWG
(0.4 mm)
(kbps) km miles km miles km miles
19.2 22.5 14.0 10.0 6.2 7.5 4.7
14.4 24.5 15.3 11.0 6.9 8.2 5.1
9.6 29.0 18.1 13.0 8.1 9.5 5.9
7.2 33.0 20.5 15.0 9.4 11.0 6.9
4.8 36.0 22.5 16.0 10.0 12.0 7.5
3.6 40.0 25.0 18.0 11.2 13.5 8.4
2.4 47.0 29.3 21.0 13.1 15.7 9.8
1.2 55.0 34.3 28.0 17.5 21.0 13.1