Telenetics Modular Nest manual Setting Control Across Groups, Example

	Part No. TEL–09949, Rev A
Pre-Installation Information and Activities	June 2001
	Page 22 of 34

Setting Control Across Groups

You can use cables to daisy-chain NC ports on 326X Series Modem cards, as you can with stand-alone modems. With 9- and 21-card backplanes, you can also set NMS Bus DIP switches on the backplane so that all NC signaling is bussed to one NC Port.

To bus two or more groups’ NC signaling to one NC Port using Bus DIP switches:

•Groups must be contiguous (Group 3 to Group 2 to Group 1)

•The NC port you plan to use must be the lowest-numbered NC port, and it must have its Bus Master slot occupied

•The NMS Bus DIP switch between groups whose signals are to be bussed to a common NC port must have all six positions set to the low number (if all six positions are set to the high number, daisy-chaining is disabled)

Caution

Do not mix switch settings to high and low numbers. This causes interference with Network Control signaling.

Example

For example, to bus signals from group 2 to group 1’s NC port:

1)Ensure that Bus 1 Master slot is occupied. Other slots in groups 1 and 2 need not be (because the backplane uses a “multi-drop bus,” successful bussing of NC signaling along the backplane takes place even when slots are unoccupied).

2)On the backplane, locate the NMS Bus DIP switch between Bus 1 Master slot and Bus 2 Master slot (Figure 11). Set all six NMS Bus DIP switches to 1.

3)Connect the network management cable (supplied with your network manager) from the Bus 1 Master slot NC IN port to the network manager.

Figure 11 illustrates this example.