Paradise Datacom P300 Series Installation & Operating Handbook page 175

Sw1 position 2
Installation note: If installing the G.703 card, the BNC labelled `IN` connects to J3 on the card, and the
BNC labelled `OUT` to J2 on the card.
Q323 G.703 (Special) option PCB
The Q323 is a modified version of Q302 G703 card. The "Q302" switches are
configured as normal. (Please see P300 Installation and Operating handbook)
The additional logic allows the E1 frame data to be modified to solve interaction problems with AIS
data.
The logic does not support modified T1 data.
If the switches are all off, then the data path is just delayed by one bit in both directions.
The new functions are controlled by SW3 on the PCB.
Option OFF
SW3-1 Normal Operation
SW3-2 TS0 transparent
SW3-3 TS16 modified
SW3-4 TS1-31data inversion
SW3-3 and SW3-4 have no effect if SW3-1 is OFF.
The card supports the following modes.
SW3:
1 2 3 4 Mode
0 0 0 0 Transparent
0 1 0 0 Transparent + CRC4
1 0 0 0 TS1-31 Invert
1 1 0 0 TS1-31 Invert + CRC4
1 0 0 1 TS1-31 Bit Invert
1 1 0 1 TS1-31 Bit Invert + CRC4
1 0 1 0 TS1-15, 17-31 Invert
1 1 1 0 TS1-31 Invert + CRC4
1 0 1 1 TS1-15, 17-31 Bit Invert
1 1 1 1 TS1-15, 17-31 Invert + CRC4
1 = switch on, 0 = switch off
When transparent TS16 options are selected and the P300 is in drop and inset
mode, the P300 modem must be set to maintain timeslot identities if TS16 is part of
the drop and insert group.
P300H P300 Series Modem Installation and Operating Handbook
1:1 Operation, the G.703 output goes high impedance if power is
removed allowing the units 1:1 partner to carry the traffic. The normal
input impedance switches to whichever one is on-line (with the standby
input at high impedance)
ON
TS1-31 Modified
TS0 Bit 1 overwritten with CRC4
TS16 transparent
TS1-31 bit mask inversion
Description
Card functions as standard Q302
As above with CRC4 multi-frame in TS0 bit 1
Data through the modem is inverted
As above with CRC4 multi-frame in TS0 bit 1
Data bits 1, 2, 5 and 6 are inverted
As above with CRC4 multi-frame in TS0 bit 1
Data through the modem is invertedTS16 -
Channel Associated Signaling support
As above with CRC4 multi-frame in TS0 bit 1
Data bits 1, 2, 5 and 6 are inverted TS16 -
Channel Associated Signaling support
As above with CRC4 multi-frame in TS0 bit 1
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