Part No. TEL–09949, Rev A
June 2001
Pre-Installation Information and Activities
Page 23 of 34

Figure 11. Combining NC Ports With Backplane NMS Bus DIP Switches

Cautions and Limitations for Network Management Cabling
The enclosure daisy-chain (leased line) interface and the multi-drop (dial line) bus
features do not support certain NC cabling applications. You can connect multiple
NC Master modems to operate in a daisy-cha in or operate in a multi-drop bus
configuration. However, there can be only one NC slave configured in an enclosure
multi-drop bus group or daisy-chain.
Check your NMS documentation for the maximum number of modems per channel.
Do not bus more modem NC signals to a single NC port than the network manager
can handle on a single channel.
Some applications require multiple NC slaves in an enclosure using the multi-drop
NC bus. In this case, use the larger backplanes to accommodate multiple groups. For
example, one NC slave is allowe d for each group. For the number of groups that
each backplane can accommodate and the number of modem cards in those slots,
refer to Table 4.
COMM +5V +12V -12V AC POWER
123456
1
2
2
2
2
2
2
1
1
1
1
1
NMS BUS
NC Port and
Bus Master Locations
Are within Shaded Areas
Bus Master
Switch
DIAL LINE A
2W LEASE
DIAL LINE B
2W/4W LEASE
OUT
NC
MSTR
2IN OUT
NC
MSTR
1
NC BUS
A8 A6 A4 A2
A9 A7 A5 A3 A1
B8 B6 B4 B 2
B9 B7 B5 B3 B1
SLOT98 76 5 4 32 1
AAAAAAAAA
DTE DTE DTE DTE DTE DTE DTE DTE DTE
BBBBBBBBB