Telenetics Modular Nest manual Leased or Dial Line Network Managed Command Flow Path

	Part No. TEL–09949, Rev A
Pre-Installation Information and Activities	June 2001
	Page 19 of 34

Figure 8 shows a single NC command flow path. In the figure, the local masters receive network control from a single network manager source.

Network	Modular Nest 9 or 21 Enclosure		Modular Nest 9 or 21 Enclosure
		Backplane
Manager			Backplane
		Local	Remote	In-Connector
		Master	Slave	from Backplane:
				Not Used.
		Local
In-Connector		Slave
from Backplane.
For Any			Remote	For Any
Daisy-Chained			Master	Daisy-Chained
Device.				Device.

Out-Connector from Backplane.

Digital NC Bus

Notes: (1) The dotted lines indicate the NC command flow path.

(2)The network manager regards all 326X Series Modems in a group and their associated slaves as operating on a single NC channel.

Out-Connector from Backplane.

Figure 8. Leased or Dial Line Network Managed Command Flow Path

Each 326X Series Modem backplane provides network control (NC) ports for connection to a Network Manager:

•The 21-card backplane has four NC ports (NC 1 - NC 4)

•The 9-card backplane has two NC ports (NC 1 and NC 2)

•The 1-card backplanes each have one NC port

With the 1-card backplane, the NC port is only for the modem occupying that slot, but with the 9-, and 21-card backplanes, one NC port is assigned to serve a group of 4, 5, or 6 modem cards as outlined in Table 4.

Table 4.

Number of Groups vs. Number of Modem Cards per Slot

Backplane	Number of	Number of Modem Cards in a
Size	Groups	Group
1 Card	1	1
9 Card	2	5 and 4
21 Card	4	5, 5, 5, and 6