Test Access Matrix to test a 2 wire circuit

Normal State:

Circuit switched through

Switched State:

Left hand side routed to test points, test, listen

Possible Tests:^_‡

dc voltage
ac voltage
Capacitance
Resistance
Loop
Disconnect
Each leg to ground, dc, ac, etc
Listen
Noise
Measure cable length

^‡_{If test equipment supports test}

Normal State:

Circuit switched through

Switched State:

Right hand side routed to test points, test, listen

Possible Tests:^‡

dc voltage
ac voltage
Capacitance
Resistance
Loop
Disconnect
Each leg to ground, dc, ac, etc
Listen
Noise
Measure cable length

^‡_{If test equipment supports test}

Normal State:

Circuit switched through

Switched State:

Both side switched through - monitor line, test, listen

Possible Tests:^‡

dc voltage
ac voltage
Capacitance
Resistance
Loop
Disconnect
Listen
Noise

^‡_{If test equipment supports test}