Telenetics Modular Nest 用户手册

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

123

456

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

SLOT9

DTE