Service manual

GS160/320 Component Removal and Replacement 4-21

Each module placed in a QBB is color-coded to correspond to both system box

and drawer color-coded slots. Table 4–7 lists the modules and their associated

color codes. Figure 4–4 shows slot location color codes for both system boxes

and drawers.

For system box systems, QBBs located at the front of system cabinets have

global port slots located on the rear of the backplane. Note that the system box

orientation depends upon where the box is relative to the hierarchical switch.

In Figure 4–1, the orientation of system boxes with QBBs 0 and 2 is rotated 180

for QBBs 4 and 6. Also note global ports for both back and front QBBs can only

be seen at the back of the machine.

For drawer systems, the color codes shown in Figure 4–4 apply to the modules

in both drawers though the slot location is slightly different from the slot

location in system boxes. Separate global port modules are not necessary for

drawer systems since the global port function is designed into the drawer

backplane.