Puts the locally attached DSU (Internal to the Router) in Loop. This allows the testing of the local Card for errors with the line driver or modulator
Requests a loopback from the remote DSU. This allows the testing of the full circuit up to the DSU at the far end.
Sets the local controller to loop towards the network allowing the far end to run test patterns across the entire path.
controller t3 1/0 !-- test the local hardware loopback local ! bert pattern 0s interval 1 do show controller t1 0/0 ! bert pattern 1s interval 1 do show controller t1 0/0 ! bert pattern alt-0-1 interval 1 do show controller t1 0/0 ! no loopback controller t3 1/0 !-- test to the remote DSU. loopback remote bert pattern 0s interval 1 do show controller t3 1/0 ! bert pattern 1s interval 1 do show controller t3 1/0 ! bert pattern alt-0-1 interval 1 do show controller t3 1/0 ! no loopback controller t3 1/0 !-- allow the far end to perform end-to-end testing. loopback network ! !-- WAIT FOR TESTING AT FAR END TO COMPLETE.. ! no loopback ! end
You can transmit endpoint location information across a circuit using the ANSI Maintenance Description Set. The following example shows how this is specified:
Circuit Labeling Example:
controller t3 1/0 !-- Identification notation transmited via ANSI MDL Frames mdl string eic RouterA !-- Equiptment ID Code mdl string fic 0x01 !-- Frame ID Code mdl string generator gen-1 !-- Generator Number in MDL Test Signal Message mdl string lic OKC !-- Location ID Code mdl string pfi DT !-- Facility ID Code mdl string port 1-0 !-- Port Number in MDL Idle Signal Message mdl string unit 2 !-- Unit Code ! mdl transmit test-signal ! end
Viewing example at far end of circuit:
show controllers t3 1/0 Results: T3 1/0 is up. Applique type is Subrate T3 Transmitter is sending AIS. Receiver has no alarms. MDL transmission is enabled EIC: Router-B, LIC: TUL, FIC: FO, UNIT: 1 Far-End MDL Information Received EIC: Router-A, LIC: OKC, FIC: DT, UNIT: 1 FEAC code received: No code is being received Framing is C-BIT Parity, Line Code is B3ZS, Clock Source is Line Data in current interval (30 seconds elapsed): 0 Line Code Violations, 0 P-bit Coding Violation 0 C-bit Coding Violation, 0 P-bit Err Secs 0 P-bit Severely Err Secs, 0 Severely Err Framing Secs 0 Unavailable Secs, 0 Line Errored Secs 0 C-bit Errored Secs, 0 C-bit Severely Errored Secs ! end