Multitech MMH900 Uživatelská příručka stáhnout pdf (Strana 104)

104

Chapter 6 - Operating Procedures

Composite link down with CO CTS and REMOTE DWN LEDs

Problem External modem settings on remote mux

Solution 1. Verify that external modem is set for sync, full

duplex and internal clocking.

2. Connect composite link cable between mux and

modem.

Composite link and all channels down with REMOTE DWN

and all channel RCV LEDs ON

Problem Mux memory failure

Solution 1. Enter L and recore all channel parameters before

running memory test. Perform test by entering &T2

command. All stored parameters will be destroyed.

2. Reconfigure all channel parameters.

Flashing LINK ALARM LED

Problem High error rate on communication line

Solution 1. View composite link statistics using #S0

command.

2. Perform local and remote loopback test, refer to

the Local and Communications Line Testing in this

chapter.

3. Call phone company and verify communication

line.

All channel devices not communicating with mux, composite

link up with CO, CTS,XMT and RCV LEDs ON and REMOTE

DWN OFF

Problem Incorrect channel parameter settings

Solution 1. Verify channel parameter settings for all channels,

refer to Chapter 4 for the CO command.

2. Change channel paramters to match channel

devices. Refer to Chapter 4 for Channel Paramter

Commands.

3. perform channel device testing, refer to Channel

Device Testing in this chapter.

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Multitech MMH900 Uživatelská příručka Strana 104