Test Access Matrix to test a 2 wire circuit

Two wire Test Access Matrix

Two wire Test Access Module

Test Access Matrix - two wire

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