Chapter 4 E1 Testing
Measuring timing slips
SmartClass E1 Tester User’s Guide 39
11 Restart the test.
12 To view other results, see “E1 Results” on page 78.
You have finished monitoring the circuit.
Measuring timing slips
The SmartClass E1 allows you to monitor the timing between two E1 signals
for timing slips. For example, you can check customer premises equipment
against a master clock at the central office, or you can compare two lines of
network equipment. The SmartClass measures the difference, in bits per
second (bit/s), between the opposite receiver (Rx) or the external 2M Refer-
ence clock.
The following procedure describes how to measure timing slips.
To measure timing slips
1 Launch the E1 BERT application. See “Launching an E1 test application”
on page 28.
2 On the Configuration menu, select Test Mode.
A list of test modes appears.
3 Select Monitor.
4 Connect the E1 Tester to a reference signal and to the test signal:
– Connect the 2M Reference Clock cable from the E1 Tester’s RX2/
Ext Clk jack to an E1 BITS clock or a known good reference signal.
– Connect a cable from the E1 Tester RX1/TX1 jack to the signal to be
tested.
5 On the Configuration menu, select Interface Settings.
6 Select Slip Reference and then select the clock reference for timing slips.
See “Slip Reference” on page 31.
7 Restart the test.
This will clear all alarms and begin a new test.
8 On the test menu, select Results, and then select Signal Results.
The Signal Results window appears.
9 Check the timing slips result.
For a description of the result, see “Timing Slips” on page 80.
You have finished measuring timing slips.
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