
TELEPHONE INTERFACE MODULE (TIM)
Type | Idle | Active |
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I | Ground | |
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II | Open | |
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III | Ground | |
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IV | Open | |
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V | Open | Ground |
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7 (Off), 8 (On) | Open | Ground |
7 (On), 8 (Off) | Ground | Open |
14.2.4 TYPE I AND V
A straight interconnect between the trunk circuit and signaling circuit. Two conductors are signaling and four are balanced audio (see Figure
TRUNK |
| SIGNALING | |
CIRCUIT | RNT |
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TR1
TX AUDIO

RR1

T1
RX AUDIO

R1
14.2.5 TYPE II AND III
A straight interconnect between the trunk circuit and signaling circuit. Two conductors are signaling, four are balanced audio and two are System Battery and System Ground (see Figure
TRUNK |
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CIRCUIT | RNT |
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SB |
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SG |
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| SG |
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TX AUDIO |
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T1
RX AUDIO

R1
14.2.6 TYPE IV
This interface is a
TRUNK |
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CIRCUIT | RNT |
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SB |
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SG |
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TX AUDIO |
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| RR1 | |
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T1
RX AUDIO

R1
14.2.7 TYPE II
Some applications may require an interface to another trunk circuit (e.g. PBX). This interface is a