ADC 2, and 3 Doubler, HDU-409 Lists 1 30

Loopback Operation in HiGain Systems	LTPH-UM-1234-01

DSX-1

Loopbacks Toward Network

TLOS

HLU

HDSL SPAN

LOGIC

All ones

HRU

SMJK*

HLU

HDSL SPAN

11000

2-in-5

All ones

HRU

NREM*

HLU

HDSL SPAN

1110000

3-in-7

All ones

HRU

Interface

HDU

NDU1

NDU2

NDU3

NDU4

HLU

SPAN 1

2-in-6

SPAN 2

3-in-6

SPAN 3

1010001

SPAN 4

1010010

SPAN 5

HRU

All ones

110000

111000

Customer-

NLOC

1111000

4-in-7

HDSL SPAN

HRU

All ones

HLU

Loopbacks Toward Customer

CREM

All ones

6-in-7

1111110

HDSL SPAN

HRU

HLU

CLOC

All ones

HLU

HDSL SPAN

1111100

5-in-7

HRU

CDU1

CDU2

CDU3

CDU4

All ones

HLU

SPAN 1

4-in-6

SPAN 2

5-in-6

SPAN 3

1011001

SPAN 4

1011010

SPAN 5

HRU

111100

111110

HDU

*Set the SAIS option to ENA to send AIS (indicated by an all ones pattern) to the CI during SmartJack loopback, NREM, and TLOS. Use the 3-in-5 code to loop down.

H0082-A

Figure 6. HiGain Loopbacks

For more information about other doubler loopback commands, see the appropriate HLU user documentation.

April 30, 2003

HDU-409 Lists 1, 2, and 3