Instruction manual

JUPITER CM-4400 Control Module Installation and Operating Manual 77

The CB 3000 Control Buffer

Figure 36. The CB 3000 Control Buffer - Front and Rear Panel

The CB 3000 Control Buffer is required for buffering crosspoint data when

the Crosspoint Bus is sent to more than one equipment rack. A CB 3000 may

also be needed if the system includes more than one router type (For

example, a Trinix and an Apex) and one of the routers is at or near the bus

limit. For more information, contact Grass Valley Tech Support (see Con-

tacting Grass Valley on pa

ge 4).

Each of the eight CB 3000 outputs can drive up to 50 (TVS/TAS) or up to 96

enus) crosspoint boards.

Each CB 3000 output contains two identical channels, with channel A nor-

mally used; this condition is indicated

by the eight green LEDs in the

display window. If a fault is detected in channel A, that output will auto-

matically switch to channel B; in this cas

e the green LEDs would be off and

one or more red LEDs would be on. If a changeover occurs, first check to

see if the unit will return to normal operation by pressing the

Select A

button:

• If the unit returns to channel A operation, but a red LED remains on,

ess the

Clear button on the front of the CB 3000 (Figure36). If the red

LEDs turn off, it can be assumed that the unit is fully operational.

• If the unit immediately returns to channel B operation, contact Grass

Valley Technical Support (see Contacting Grass Valley on page 4). For a

description of the front panel window LEDs (see CB 3000 Crosspoint

Buffer and Interface on page 241.)

Router Requirements

Apex audio routers do not require a CB 3000-regardless of system expan-

sion-because the crosspoint bus is connected only to one chassis.

For Trinix requirements, please refer to

the Planning section of the Trinix

Planning and Installation Manual.

SELECT

CLEAR

POWER

REM/ALM

OUTPUT

(CONTROL)

BUSES

CROSSPOINT

BUS LOOP