Multi-Tech Systems MMV1600 Channel Board Number of Channels Switch, RS232C/V.35 Shunt, Channel #

The aggregate board 8-position DIP switch SW-5 is shown in Figure E-3 and the function of each position is as follows:

Switch position 1:	Closed	Initiate Downline Load Off
	Open(UP)	Initiate Downline Load On
		(used for downline loading only)
Switch position 2:	Closed	External Link A Device Selected
	Open (UP)	Internal Link A DSU Selected
Switch Position 3:	Closed	External Link B Device Selected
	Open (UP)	Internal Link B DSU Selected
	Channel #	8	16	24	32
Switch Position 4:		C	O	C	O
Switch Position 5:		C	C	O	O
			C= Closed, O=Open
Switch Position 6:	Closed	Disable Command Modem Remote Access
	Open (UP)	Enable Command Modem Remote Access
(default)
Switch Position 7: Not Used
Switch Position 8:	Not Used

Channel Board Number of Channels Switch

The Channel board four-position DIP switch determines which channel numbers a particular channel board represents. The first channel board needs to be installed in the third slot from the bottom of the chassis and the 4-position DIP switch on that board has to be set with switch positions SW-1 and SW-2 in the closed position. If the MultiMux has 16 channels, then two channel boards are installed in the chassis and the channel board in the fourth slot from the bottom of the chassis has switch position SW-1 in the open position and SW-2 in the closed position. The function of the switch is as follows:

Channel #	1-8	9-16	17-24	25-32
Switch Position 1:	C	O	C	O
Switch Position 2:	C	C	O	O
		C= Closed, O=Open

RS232C/V.35 Shunt

An external composite link modem or DSU with either an RS232C/V.24 or a V.35 interface can be connected to a MultiMux MMV1600/3200 series. The aggregate board has four shunt locations on the board, two positions for composite link A and two for composite link B and each link can connect either an RS232C or a V.35 interface. When an external composite link modem with an RS232C/V.24 interface is connected to one of the composite links, the V.24 shunt for that composite link is installed on the aggregate board. When the external composite link modem or DSU has a V.35 interface, the shunt for that composite link has to be moved from the default position (RS232C/V.24) to the V.35 position. The shunts are shown in Figure E-4. The factory default position for the shunts is in the RS232C/V.24 position.

Figure E-4. RS232C/V.35 Shunts