TSW200E1
connect together the grounds of the TSW200E1 and of the clock-providing
equipment.
From RX: when the clock is regenerated from reception. This option is available
only for the G.703 interface.
• Tx Rate: see section 4.1
• Pattern: see section 5.3.1
• Polarity: see section 5.3.1
• Line Code: see section 5.3.1
• PCM: see section 5.3.1
• Idle Code: see section 5.3.1
• NFAS/NMFAS: see section 5.3.1
• ABCD Bits: see section 5.3.1
• Termination: see section 5.3.1
• Tx Slots: see section 5.3.1
• Rx Slots: see section 5.3.1
As the test is performed in loopback mode, the timeslots selected must be the same for
transmission and reception.
5.9.2 - Performing the ROUND-TRIP DELAY test
After connecting and setting up the Test Set correctly, press START/STOP key to start the
test. Remember that the circuit must be in loopback. The following screen will be displayed:
<F3> (SET ZERO) allows subtraction of one local delay from the total measurement (Zero
Correction). An example of how this can be used is to remove the round-trip delay from a local
equipment from the total delay measurement for a remote loopback. To do this, start the test-setting
loopback for the local equipment and press <F2> (SEND). An error is then inserted. Then, press
<F3> (SET ZERO). Now, set up the loopback in the remote equipment and press <F2> (SEND)
again. The resulting “round-trip delay” is the delay introduced by the network and by the remote
loopback, notwithstanding the local equipment delays. The delay is re-evaluated each time <F2>
(SEND) is pressed. Pressing <F4> (RESET) sets “Zero Correction” to zero.
The “Round-trip Delay” evaluation can be done for framed circuits similarly as for
unframed circuits.
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