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A. Configuration Options
A-8
May 2002 8700-A2-GB20-40
Line Framing
Possible Settings: ESF, D4
Default Setting: ESF
Specifies the framing format to be used by the DSX-1 interface.
Line Framing is only available when the unit is configured as an LTU. The NTU is
automatically configured to match the framing format used by the LTU.
ESF – ESF framing formatting is used for transmitted and received data over the DSX-1
Interface.
D4 – D4 framing format is used for transmitted and received data over the DSX-1
Interface.
Line Equalization
Possible Settings: 0–133, 133–266, 266–399, 399–533, 533–655
Default Setting: 0–133
Compensates for signal distortion for a DSX-1 signal over a given distance.
0–133 feet – Provides equalization for a cable length up to 133 feet.
133–266 feet – Provides equalization for a cable length up to 266 feet.
266–399 feet – Provides equalization for a cable length up to 399 feet.
399–533 feet – Provides equalization for a cable length up to 533 feet.
533–655 feet – Provides equalization for a cable length up to 655 feet.
Excessive Error Rate Threshold
Possible Settings: 1E– 4, 1E–5, 1E– 6, 1E–7, 1E– 8, 1E–9
Default Setting: 1E–4
Determines the error rate at which an excessive error rate (EER) condition is recognized.
The rate is the ratio of the number of CRC errors to the number of bits received in a
certain period.
1E–4 – 1E-9 – The rate at which EER is recognized.
Primary Clock Source
Possible Settings: Internal, DSX-1
Default Setting: DSX-1
Specifies where the unit will derive its timing from.
Primary Clock Source is available only when the unit is configured as an LTU.
Internal – Timing is derived from the internal oscillator.
DSX-1 – Timing is derived from the DSX-1 interface.
Table A-4. DSX-1 Interface Options – Model 8777 (2 of 2)