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TC12 Installation, Commissioning & Maintenance Handbook
666/HE/43100/000
Page 36
Issue 10
2.2.5 Digital Output Rack, PCBs and PSUs
The digital output rack is the same size as the ITU rack except that 17 card guides
are fitted. These take one PSU PCB and between 1 and 16 Digital Output PCBs.
The assembly drawing for the rack is 667/GA/22626/001. One or two racks may
be fitted to an Instation.
2.2.5.1 PSU PCB
The PSU PCB is identical to the ITU rack PSU PCB so see section 2.2.4.1 for
configuration details. Details of how to connect to the digital output rack are in the
next section.
2.2.5.2 Digital Output PCB
There are several variants of the PCB, /000 to /099 have current source outputs
and /100 to /199 have current sink outputs. The variants in those two groups are to
cope with different output current limit values.
See Figure 13 for a diagram of the board layout showing the position of
connectors, LEDs and switches.
Figure 13 - Digital Output PCB Layout
1 (TOP)
1
(
TOP
)
PL2
S1
PL1
1 (TOP
)
40
PL4
PL5
40
Serial
Number
Variant No.
LP1 POWER LED
LP1 WATCHDOG LED
1 (TOP)
14
PL3
50
1 (TOP)
14
FS1FS2
FS3FS4