Atm Backplane; Figure 3. Star-Wiring Topology In Atm Backplane - IBM Nways 8265 Product Description

ATM Backplane

1. You cannot install a media module in slot 12 if a CPSW module is installed in slots 11-12.
4
IBM 8265: Product Description
All data transmitted between modules in the ATM subsystem passes through the ATM
backplane. Data is switched between media modules in the ATM subsystem by a
Control Point and Switch (CPSW) module. CPSW modules are installed in slot
positions 9 and 10 or 11 and 12 in the 8265 switch (see Figure 3 on page 4).
Each media module has a dedicated set of connections to the CPSW module. This
set of dedicated connections constitutes a star-wiring topology in which the media
modules are at the tips of the star and the CPSW module at the center. The wiring
topology used in the ATM backplane is shown in Figure 3.
1 2 3 4 5

Figure 3. Star-Wiring Topology in ATM Backplane

The main characteristics of the ATM backplane are as follows:
Modular structure
•
Full floating media modules
•
Support of two CPSW switch modules for reliability and redundancy.
•
You can install a media module in slots 1 to 8 and 12 to 17, but not in slots 9 to 11
(slots 9-12 are reserved for CPSW modules
installed in slots 1, 3, 5, and 7. See page 24 to determine which modules can be
installed in which slots.
8260 ATM modules can only be installed in slots 1, 3, 5, and 7.
After installing the module, you must configure it for operation by entering a series of
commands from the CPSW module console.
Fan Area
6 7 8 9 10 11 12 13 14 15 16 17
Slot positions for
CPSW modules:
9-10 and/or 11-12.
Slot positions for
media modules:
1 to 8 and 12 to 17.
Serial interface linking
two CPSW modules.
1
.) Certain media modules can only be