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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-chain 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 allowed 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
2
IN OUT
NC
MSTR
1
NC BUS
A8 A6 A4 A2
A9 A7 A5 A3 A1
B8 B6 B4 B2
B9 B7 B5 B3 B1
SLOT98 765 432 1
AAAAAAAAA
DTE DTE DTE DTE DTE DTE DTE DTE DTE
BBBBBBBBB