
Loopback Operation in HiGain Systems | |
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| Loopbacks Toward Network |
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| TLOS |
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| HLU |
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| HDSL SPAN |
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| LOGIC | All ones |
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| HRU |
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| SMJK* |
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| HLU |
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| HDSL SPAN |
| 11000 | All ones |
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| HRU |
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| NREM* |
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| HLU |
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| HDSL SPAN | 1110000 | All ones |
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| HRU |
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| Interface |
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| HDU |
| HDU |
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| NDU1 |
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| HLU | SPAN 1 | SPAN 2 | SPAN 3 | 1010001 |
| SPAN 4 | 1010010 | SPAN 5 | HRU | All ones |
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| 110000 | 111000 |
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| Customer- |
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| NLOC |
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| 1111000 |
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| HDSL SPAN |
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| HRU | All ones |
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| HLU |
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| CI | |
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| Loopbacks Toward Customer |
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| CREM |
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All ones | 1111110 |
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| HLU |
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| CLOC |
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All ones | HLU |
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| HDSL SPAN | 1111100 |
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| HRU |
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| CDU1 |
| CDU2 |
| CDU3 |
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All ones | HLU | SPAN 1 | SPAN 2 | SPAN 3 |
| 1011001 | SPAN 4 | 1011010 | SPAN 5 | HRU |
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111100 | 111110 |
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| HDU |
| HDU |
| HDU |
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| HDU |
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*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
Figure 6. HiGain Loopbacks
For more information about other doubler loopback commands, see the appropriate HLU user documentation.
24 | April 30, 2003 |