Multitech MMH900 User Manual page 104

Composite link down with CO CTS and REMOTE DWN LEDs
ON
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.
Chapter 6 - Operating Procedures
104