L7755 Audio Gateway Circuit Board.
The L7755 Audio Gateway Circuit Board is provides a link between the analogue speech network and the
digital IP speech network. This allows the speech to be integrated from the legacy network devices to IP
devices such as IP Phones, GUI Front ends, IP DECT Phones and many other modern telephony systems. The
L7755 card is located alongside the L7700 circuit board and power and signalling is derived from the L7700
circuit board. The L7755 Audio Gateway requires an additional IEEE 802.3 Compatible 10Base-T interface
using copper RJ45 connector in addition to the L7700 circuit board.
The L7700 and L7755 must have a unique IP Address on the Local Area Network. Set the L7700 and the
L7755 to the same Channel Number so they operate together. On the L7700 system setup screen you must
tick Audio Board Fitted. If you wish to synchronise the time, you can pick a single L7700 and set it to Time
Master this will automatically update the L7755 internal clock as it a Time Slave by default.
The speech network (Belden 8760 cable) is only connected to the L7755 Circuit.
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