Multi-Tech Systems MMV1600 owner manual RD LED on

not communicating		not installed on Supervisory		supervisory console, refer to comm		with mux command
Console.		software user’s manual forinstallation.
port	2.	Bad cable or cable	1.	Check RS232 cable connections
connection	between supervisory				console and COMMAND PORT on
		MultiMux for loose connection or				bent pins, refer to Supervisory
				Console Installation procedures in
Chapter 4
			2.	Check RS232 cable connections
between supervisory console and					COMMAND PORT on MultiMux for
		correct cable wiring, refer to Cable				Diagrams in Appendix
C.
Supervisory Console	1. Incorrect command		1.	Verify command modem baud rate is		not communicating
modem baud rate		set to 2400 bps, refer to Comm		with command mode			Software
User’s Manual.
			2.	Call Tech Support for assistance,
refer to Chapter 8
Garbage on	1. Incorrect session		1.	Verify session parameters (data bits		Supervisory	parameters
	of 8, parity none, 1 stop bit), refer to				Console Screen		comm
software user’s manual for					parameter settings.
			2.	Call Tech Support for assistance,
refer to Chapter 8
Composite Link down	1. Composite Link cabling		1.	If internal DSU is installed, check
with CTS, XMT, and	connection.			Composite Link cabling for loose		RD LEDs ON
			2.	If external DSU or modem is
installed, check RS232C/V.35 cable					between devices for loose
		connection or bent pin.
	2. Not receiving data from		1.	Verify that both muxes are powered			remote mux
	ON.
			2.	Verify that both muxes are
connected to communications line.
		Table 7-1. Data Troubleshooting Guide(Continued)
Condition		Possible Cause			Corrective Action
Composite link down	2. Not receiving data from		3.	If external modem are used, verify		with CTS, XMT and
remote mux (Continued)		that they are powered ON and
RD LEDs ON				connected to the communication
(Continued)				line and Mux composite link.
			4.	Call Tech Support for assistance,
				refer to Chapter 8.
communication line.	3. Faulty communication line		1. Call phone company and verify
			2.	Call Tech Support for assistance,
refer to Chapter 8.
Composite Link down	1. Both Muxes set up for		1.	Remove front cover of both muxes
with CD, CTS, XMT and		down line loading		and verify if DIP-Switch 1 is in the
RCV LEDs ON and				UP (ON) position.
RD LED ON			2.	Place DIP-Switch 1 on one of the
muxes in the DOWN (OFF) position.
			3.	Call Tech Support for assistance,
refer to Chapter 8.
	2. Internal DSU speeds		1.	Verify internal DSU speeds with $L		on local and remote
	command, refer to Chapter 5.
		muxes do not match.
Composite link down	1. External modem settings		1.	Verify that external modem is set for
with CD, CTS and		remote mux		sync, full duplex and internal clocking.