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Chapter 8 - Determining Intercom Needs 119
Figure 8.2
Figure 3. Block diagram of a medium sized intercom system using two-wire. The
forms of communications depicted here are six conference lines and eight IFB circuits.
862 System Interconnect
The Model 862 System Interconnect Panel is the bridge between the Series 800 two-wire
balanced portion and the unbalanced TW section.
PS31 Power Supply
The PS31 TW Power Supplies provide six powered conference channels (three each). All
RTS
™
power supplies contain active impedance generators to allow two-wire intercom
audio to be superimposed on the powered channels.
SAP1626 Source Assign Panel
The SAP1626 Source Assignment Panel provides the TW system with its own intercom
circuit switcher. In our particular application, the SAP1626 panel provides two functions:
it assigns each of the 2 TW channels (stations on the right) to 1 of 12 conferences amongst
themselves; and, it fixes each of these conferences to one of the 12-talk/listen buttons on
the 803 stations. This provides maximum routing capability, which would be more useful
in a mobile vehicle than in the fixed installation.
BOP220 Connector Translation Assembly
The BOP220 is a breakout panel that allows the TW stations to be attached to the system.
The BOP220 (Break Out Panel, 2 Channel, 20 Jacks) connects to the SAP1626 on two
short 25 pair ribbon cables. There are 20 positions available for user stations. Microphone
cable or Belden
™
8723 is all that is required for interconnection.
4010 IFB Central Electronics Unit
Located in the audio room, the 4010 unit provides the logic switching and power and
program volume adjustments for the 4030 talent user stations. One of the 4010 units
handles the first group IFB 1-4, while the other controls the second group IFB 1-4. The
program sources for the IFB system are introduced to the 4010 units and then fed to the
talent stations on ordinary microphone cable.