8571—Technical description
350 NGT Transceiver System Technical Service Manual
Multi-line capability
The information in this section should be read in conjunction with the following
diagrams:
A second input/output line (2W or 4W), may be provided by fitting an additional line
unit to the 8571.
The additions required for a second line are as follows:
• 2-wire line isolating assembly 08-03817, or
• 4-wire line isolating assembly 08-03995
An additional third and fourth line (2W or 4W) require a second Dual Line Equaliser
PCB.
The additions required for a third and fourth line are as follows:
• Dual Line Equaliser PCB 08-03905, and
• 2-wire line isolating assembly 08-03817, or
• 4-wire line isolating assembly 08-03995
The Dual Line Equaliser PCB providing input/output lines 3 and 4 is identical to the
PCB already fitted for input/output lines 1 and 2.
To enable the microprocessor to individually control either PCB, the ADC and
input/output expander on each PCB is provided with a separate address (0, 1, 1, 0 for
lines 1 and 2, and 0, 0, 1, 0 for lines 3 and 4). The address is set for each assembly when
they are fitted to the appropriate connector on the Backplane PCB and is applied to P1
pins 10a, 10b, 11a and 11b. Once the addresses have been set for the PCBs, they remain
the same even if the card positions are reversed.
8571 Remote Control (NGT)
Interface Assembly
08-05994 (sheet 1)
Backplane 08-05995
Option 2W 15-10509-001
Option 4W 15-10510-001
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