ADTRAN Total Access 3000 Specifications download pdf (Page 14)

Total Access 3000/3010 T1-OR/NIU Installation and Maintenance Practice

6 61181310L2-5D

FRONT PANEL OPERATION

The T1-OR/NIU provides the following front panel operational controls:

•

LBK pushbutton

XMT and RCV span power test points

•

DSX TX and RX monitor (MON) jacks

•

DSX TX and RX equalizer (EQ) jacks

LBK Pushbutton

The LBK push button initiates a loopback to the network and sends an AIS signal (all ones)

toward the customer end.

LBK Operation

•To activate a loopback, depress the

LBK pushbutton for two seconds. If successful, the TST

LED illuminates. Release the pushbutton.

•To release a loopback, depress the

LBK pushbutton a second time.

XMT and RCV Span Power Test Points

The test points provide front-panel access for measuring the 60 mA-current provided to the

DS1 facility when the T1-OR module is in the T1-OR mode.

Test Point Operation

Table 3 provides the VOM connections for both span current and voltage measurements.

Table 3. Span Current/Voltage Test Points

When Measured

Between Points

Measurement Taken

+TX to –TX Measures the transmit span current

A reading of 0.6 volts indicates a 60 mA span current in the transmit path

+RX to –RX Measures the receive span current

A reading of 0.6 volts indicates a 60 mA span current in the receive path

–TX to +RX Measures the actual span voltage being supplied to the facility.

This is the span voltage across the facility T/R pairs

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ADTRAN Total Access 3000 Specifications Page 14