User Manual

Trusted

Speed Monitor IFTA T8846

Issue 2 Apr 10 PD-T8846 12

3.2. Speed Monitor Interfaces

This section details the interfaces between the T8846 SIFTA and the Trusted T8442 Speed Monitor.

There are three 20 way connectors on the FTA which provide the interface to the Trusted T8442

Speed Monitor. Each connector is dedicated to one speed input group and mates directly with the

Trusted TC-801 cable assembly.

Refer to Figure 3 for the location of the connectors.

Table 3 Speed Monitor Interface Group 1

Interface Pin Description

SK2 1 Group 1 VField (A) fused output

SK2 2 Group 1 VField (B) fused output

SK2 3 Not Connected

SK2 4 Group 1 Channel 1 MID Bias

SK2 5 Group 1 Channel 1 Passive (A) output

SK2 6 Group 1 0V (ground)

SK2 7 Group 1 Channel 1 Passive (B) output

SK2 8 Chassis Ground

SK2 9 Not Connected

SK2 10 Group 1 Channel 2 MID Bias

SK2 11 Group 1 Channel 2 Passive (A) output

SK2 12 Group 1 0V (ground)

SK2 13 Group 1 Channel 2 Passive (B) output

SK2 14 Chassis Ground

SK2 15 Not Connected

SK2 16 Group 1 Channel 3 MID Bias

SK2 17 Group 1 Channel 3 Passive (A) output

SK2 18 Group 1 0V (ground)

SK2 19 Group 1 Channel 3 Passive (B) output

SK2 20 Chassis Ground