Switches S3 Timing Mode

The setting of Switch S3 determines the source of the system timing. The system timing may be provided by:

1.The G.703 network;

2.The local function card or remote baseband modem/CSU/DSU (either a rackable function card or stand- alone unit).

Set Switch S3 to “Network” timing when only one of the two connected baseband modems or CSU/DSUs employ a 64k/G.703 interface card (the “other” baseband modem connects to aV.35, EIA- 232, etc device).

Set Switch S3 to “Modem” timing when both of the connected baseband modems or CSU/DSUs employ a 64k/G.703 interface card. In this application, one G.703 interface card must be set to “Modem” timing, and the other must be set to “Network”Timing. (Please refer to the baseband modem or CSU/DSU user manual for additional configuration details).

Switches S4 and S5: Reserved for Future Use

Switches S4 and S5 are reserved for future use and should remain in the Off position.

Switch S6: Operation Mode

In some cases it is necessary to include bi-polar violations in the AMI structure when operating in Clear Channel (64 kbps) mode. This necessity is determined by communications or terminal equipment external to the the IM2RC/F. Use Switch S6 to configure the unit to transmit G.703 data to the network with or without BPVs.

S6	Setting
On	No BPVs
Off	Injected BPVs

Switches S7 and S8: Reserved for Future Use

Switch S7 and S8 are reserved for future use and should remain in the Off position.

3.2 CONNECTING THE INTERFACE DRIVER BOARD

This package contains an interface driver board that allows you to configure your front function card for G.703 operation. Figure 3 shows the Interface Driver Board connected to a Model 1092ARC front function card (You may also use this product with other Patton rack cards, such as Model 2500RC, 1045RC or 1092RC).

Model
1092ARC	Interface Driver Board
	Interface Driver Board

FRONT

Figure 3 Model IM2RC/F Driver Board mounted on Model 1092ARC

Follow the instructions below to connect the interface driver board to the front function card:

1.With the function card (such as 1092ARC, shown above) pulled out of the rack or clusterbox chassis, locate the driver board to be replaced on the top of the base unit front card.

2.Lift the old interface board gently off of the PC board.

3.Position the IM2RC/F driver board on top of the function card’s pc board with the sockets oriented toward the male pins.

Please be sure the label marked FRONT is pointed toward the front of the function card (toward the LEDs).

4.Push the Interface Driver Board gently onto the socket and re- install the function card into the rack or cluster system.