PRACTICE 553-2201-184
I- Printed
Circuit Board
L
Common
Circuitry
Connector With 2 Rows of
40 Pins Each for Shelf
Connections
Circuits
Fig. 2-l
Identification of the Circuits on the Board
INTERCONNECTION
WITH SHELF 2.06 The IO-pin connector on the rear of the circuit pack connects to
an 80-line bus system at the rear of the PE shelf. The bus lines feed
into eight multi-pin connectors. Seven of these connectors link the line
circuits to the corresponding terminal equipment and one feeds power
to the PE shelf from the power converter shelf.
.-
2.07 Thirty-two of the 80 pins per circuit pack are connected to
terminal equipment, 2 pins provide ground, 13 pins interface with the
CE via the peripheral buffer and 15 pins provide voltages to the circuit
pack.
2.08 For detailed information on terminal set line connections to the
four PE shelf connectors, refer to
553-2Wl-210.
POWER SUPPLY TO
TERMINALS
+
-9
2.09 The SL-1 set battery supply is -30 V dc phantomed over the
audio and signaling leads to each terminal
set.
2.10 As a general installation guideline. sufficient power is available for
the SL-1 set at a normal operating range of 189 ohms (see Loop Limits
in Table 3-A).
Page 2-2
Revised, 85 06