Multi-Tech Systems MMV1600 owner manual Voice/Fax Troubleshooting Guide, Voice/fax channel

Table 7-2. Voice/Fax Troubleshooting Guide

Condition	Possible Cause			Corrective Action
Volume levels not	1. Input level gain setting too	1.	Increase input level gain setting on sufficient on local			low
on remote voice/fax	remote voice/fax channel a couple			voice/fax channel	channel.	db and
recheck voice quality, refer				to the V(1/2)IL command in
	Chapter 5.
	2. Output level attentuation	2.	Decrease output level attenuation			setting too
high on local	setting on local voice/fax channel a			voice/fax channel.		couple db and
recheck voice	command in Chapter 5.			quality, refer to V(1/2)OL
Local telephone goes 1. Devices not connected to		1.	Verify that the devices are attached off-hook and remote
correct voice/fax channel.		to the correct voice/fax channel Telephone does not
ring. FXS to FXS	RJ-11 connector.
Configuration	2. Voice/fax channel	1.	Verify that each voice/fax channel			configuration
problem.	is configured correctly (FXS,FXO,				or E&M), destination
channel and			node and composite link.
		2.	Observe that the XSG LED on the
local voice/fax channel lights when				the telephone goes off-hook and
	that the RSG LED on the remote				FXS configured voice/fax channel
			flashes with each ring.
Data throughput slows	1. Too much bandwidth being 1.		Decrease voice/fax channel		excessively when one
used up for voice/fax.	digitizing rate to 9600 bps, refer to			or both voice/fax		V(1/2)DR
command in Chapter 5.
channels are active.		2.	Enable, or if active, increase silence
suppression on one or both voice/				fax channels, refer to V(1/2)SS
		command in Chapter 5.
FXS to FXO	1. Device not connected to	1.	Verify that the device is attached to
configuration - Local	correct voice/fax channel.		the correct voice/fax channel		telephone does not ring
	RJ-11 connector.
	2. Voice/fax channel	1.	Verify that the voice/fax channels
	configuration problem.		are configured correctly (destination
			node and channel and composite
link).
		2.	Verify that local voice/fax interface
type is configured for FXS and				remote interface type is set for
command in Chapter 5.			FXO operation, refer to the VL
	Table 7-2. Voice/Fax Troubleshooting Guide (Continued)
Condition	Possible Cause			Corrective Action
FXS to FXO		3.	Change the local or remote		configuration - Local
	configuration as needed using the			telephone does not ring		V(1/2)LI or
V(1/2)RI command,	(Continued)			refer to Chapter 5.

Parts of words not	1.	Part of analog signal
being heard		being clipped off.
db using the V(1/2)IL and
Voice conversation or	1.	Remote connection is
fax traffic become		different than remote
erratic after changing		interface type.
the remote interface type
local interface type and change
No communication on	1.	Composite link down.
		communication line.

1.Lower the input level gain and the output level attentuation a couple of

V(1/2)OL commands. Refer to these commands in Chapter 5.

1.Verify the remote interface type at the site that was just changed using the VL command. Refer to Chapter 5.

2.Contact the remote site to verify its

accordingly using the V(1/2)RI

command. Refer to Chapter 5.

1. Call phone company and verify either voice/fax channel

	2. Phone cords for the voice	1. Verify that the phone cords for the
	and/or fax machine are	voice and/or fax machine are		either
connected to the	connected to the correct channel		wrong channel or interface.	and/or