MRV Communications LX-4000 Series MRV 8-Wire Cabling, Adapter Wiring, LX-Series to DCE, with Ring

Appendix D - Cabling the LX-4000 Series

LX Series

Connector

Female

RJ-45

Supports RING

LX Series		Male RJ-45
Connector		Connector
CTS	1	1
DTR	2	2
XMT	3	3
GND	4	4
GND	5	5
RCV	6	6
DCD	7	7
RTS	8	8

				Modular		Modem
				Adaptor		Cable
Male	Straight Through Male
RJ-45	Cable		RJ-45
				Female
				RJ-45
						To Modem
					Male
					DB-25
	Male RJ-45		Female RJ-45			Male DB-25					DCE Device
	Connector		Connector			Connector					Pin Signal
	1	1						22			RI
	2	2							20		DTR
	3	3								2	TXD
	4	4					7				GND
	5	5								3	RXD
	6	6
	7	7							8		CD
	8	8				4					RTS
						5					CTS

Straight Through Cable	Adaptor Wiring MX-350-0179
MX-151-3027	(Female RJ-45 to male DB-25)

Figure 30 - Adapter Wiring, LX-Series to DCE, with RING

NOTE: In order to expand the functionality of the serial interface, the LX-4000 Series modular cabling allows you to connect different signals to pin 7 of the LX-4000 Series. (This pin is an input to the LX-4000 Series.) When a DCE device is connected to an LX-4000 Series serial port, the device's DCD output is connected to pin 7. In this case, the signal at pin 7 is referred to as DCD. DCD is used here for session control only, not for flow control.

When a DTE device is connected to an LX-4000 Series serial port, the device's DTR output is connected to pin 7 of the LX-4000 Series. In this case, the signal at pin 7 is referred to as DSR. (This cabling scheme also provides DECconnect compatibility, since DECconnect does not support the DCD signal.)

MRV 8-Wire Cabling

This cabling scheme provides XMT, RCV, DCD/DSR, DTR, RTS, CTS, and two signal ground wires. This cabling is provided through RJ-45 connectors. Using this cabling scheme you can concurrently use modem control and RTS/CTS hardware flow control, since there are four control signals. This scheme is useful with relatively high speed devices, complex modem control applications.

In Figure 31, one signal is referred to as CTS. The CTS signal designation refers to the signal observed at pin 1 of each serial port. Pin 1 is multiplexed to these signals.

This scheme is useful with the following applications:

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