3.6 In-Service E1 Circuit Monitoring
Monitor Mode
Bridge Mode
STU
MON
STU
OUT
OR
IN
Figure 49 In-Service E1 Circuit Monitoring
1. This test may be performed while the span is in-service.
2. From the module main menu, select TEST CONFIGURATION
and configure as follows:
MODE: STUC E1, STUR E1, or E1
Tx SOURCE: TESTPAT
FRAMING: As specified by the circuit design.
CRC-4: As specified by the circuit design.
TEST RATE: 2.048M
Rx PORT: MONITOR or BRIDGE
TX CLOCK: INTERN
When finished, press ENTER.
Note
: If unsure of what Rx PORT level to use, then use BRIDGE.
MONITOR should be used when you have a PMP (Protected
Monitoring Point) access.
3. Connect the test set to the circuit as shown in Figure 49 and
press HISTORY to acknowledge any blinking LEDs.
4. Examine the LEDs for information about the circuit:
• SIGNAL should be green, red indicates no signal.
• A valid framing type should be indicated.
• A steady ERROR or CODE LED indicates that the circuit
is working but is experiencing trouble.
• ALARM indicates a problem on the far end of the circuit.
• AIS may indicate a trouble condition where a network
element transmitting to the test set has lost its incoming
signal and has replaced it with the AIS signal.
6. From the module main menu, select E1 MEASUREMENT.
Press START (F3) and verify that the span performs to your
company’s requirements for the service delivered.
MTT-14B e_Manual D07-00-083P RevA00
Page 73 of 101
