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P300H P300 Series Modem Installation and Operating Handbook Page 172
Sw1 position 2 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)
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.