7700 MultiFrame Manual
7707IT Multi-Channel Intercom Fiber Transceiver
Page - 8
Revision 1.7
2.2.1. Audio Connections
+AUDIO IN:
Positive balanced audio input. Usable only while the associated channel is
configured for use with matrix type intercom systems. This pin is DC coupled, and
should not be connected to a party-line type intercom system.
-AUDIO IN:
Negative balanced audio input. Usable only while the associated channel is
configured for use with matrix type intercom systems. This pin is DC coupled, and
should not be connected to a party-line type intercom system.
+AUDIO OUT /PARTY-LINE:
Positive balanced audio output, or party-line input/output. This pin is
AC coupled, and is always safe to connect to a party-line type intercom system,
regardless of card configuration. While the associated channel is configured for use
with matrix type intercom systems, this connection becomes one half of the
balanced audio output. While the associated channel is configured for use with
party-line type intercom systems, this connection becomes an unbalanced audio
input/output. While the associated channel is configured for use with party-line type
intercom systems, this connection also implements circuitry for the detection and
generation of call signals.
-AUDIO OUT:
Negative balanced audio output. Usable only while the associated channel is
configured for use with matrix type intercom systems. This pin is DC coupled, and
should not be connected to a party-line type intercom system.
2.2.2. Data Connections
+RS485/+RS422 IN:
Positive RS-422 input, or RS-485 input/output. When the associated channel is
configured for use with RTS-Telex matrix type intercom systems, this pin becomes
an RS-485 input/output. When the associated channel is configured for use with
ClearCom matrix type intercom systems or any party-line type intercom, this pin
becomes an RS-422 input.
-RS485/-RS422 IN:
Negative RS-422 input, or RS-485 input/output. When the associated channel is
configured for use with RTS-Telex matrix type intercom systems, this pin becomes
an RS-485 input/output. When the associated channel is configured for use with
ClearCom matrix type intercom systems or any party-line type intercom, this pin
becomes an RS-422 input.
+RS422 OUT:
Positive RS-422 output. The RS-422 interface is usable while the associated
channel is configured for use with ClearCom matrix type intercom systems or any
party-line type intercom system.
-RS422 OUT:
Negative RS-422 output. The RS-422 interface is usable while the associated
channel is configured for use with ClearCom matrix type intercom systems or any
party-line type intercom system.
2.2.3. GPIO Connections
GPI1, GPI2:
General purpose inputs to the 7707IT. See section 3.5 for electrical characteristics,
and section 0 for connection details.
