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Part No. TEL–09949, Rev A
June 2001
Pre-Installation Information and Activities
Page 20 of 34
A group’s network management signaling is passed along a multi-drop bus in the
backplane to each NC port. One slot of each group is the Bus Master slot (NC 1 for
group 1, NC 2 for group 2, etc.). The group number is identified by the Bus Master
slot number (e.g., Group 1 uses Bus 1 Master slot). For a group’s NC port to work, its
Bus Master slot must be occupied. Figures 9 and 10 show this for each backplane.
Figure 9. NC Port and Bus Master Locations, and Groups
(1- and 9-Card Backplanes)
COMM +5V +12V -12V
AC POWER
9-Card
Backplane
1-Card
Backplane
Filler
Panels
IN
NC
OUT
Network Control Group 1Network Control Group 2
NC Port and Bus Master Slots
Are within Shaded Areas
OUT
NC
MSTR
2
IN OUT
NC
MSTR
1
NC BUS
IN
NC
OUT
IN
NC
OUT
1-Card
Backplane
1-Card
Backplane