TELEPHONE INTERFACE MODULE (TIM)

TRUNK

 

 

 

 

 

SIGNALING

CIRCUIT

RNT

 

 

 

CIRCUIT

 

 

 

 

 

M-LEAD

 

 

 

 

 

 

 

M-LEAD

 

 

 

 

 

 

 

SB

 

 

 

 

 

 

 

SB

 

 

 

 

 

 

SG

 

 

 

 

 

 

 

SG

 

 

 

 

 

 

 

E-LEAD

 

 

 

 

 

 

 

E-LEAD

 

 

 

 

 

 

 

TX AUDIO

 

 

 

 

 

 

 

TR1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RR1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

T1

RX AUDIO

R1

Figure 14-7 TYPE II TRUNK-TRUNK

14.2.8 TYPE V TRUNK-TO-TRUNK

This interface is a cross-connect between the trunk circuits. Four conductors are balanced audio and the M-Lead and E-Lead conductors are cross- connected (see Figure 14-8).

TRUNK

 

 

SIGNALING

CIRCUIT

RNT

 

CIRCUIT

 

 

 

E-LEAD

 

 

 

E-LEAD

 

 

 

M-LEAD

 

 

 

M-LEAD

 

 

 

TR1

TX AUDIO

RR1

T1

RX AUDIO

R1

Figure 14-8 TYPE IV TRUNK-TRUNK14.3 LED STATUS FOR E&M LEADS

14.3.1 TELCO SIDE STATUS

The Telco Side Status can be monitored on CR206 (M-Lead) and CR204 (E-Lead) see Figures

14-9and 14-21.These LEDs are used to show a status change on the Telco side of the E&M Personality Board. In some instances either or both could be illuminated in the idle state.

Figure 14-9 E&M PERSONALITY BOARD

14.3.2 E&M LOGIC STATUS

The status of E&M Logic can be monitored on CR401 (E-Lead) and CR403 (M-Lead) of the main board (see Figure 14-10). These are logic levels that display the true status of the E&M leads. If either LED is illuminated, that lead is active. Both LEDs should not illuminate in the idle state.

Figure 14-10 MAIN BOARD

14-7