Digium TE800 Series, Руководство пользователя

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Chapter 3: Configuration
Timing:
This determines how timing is handled by the card.
0 - This span is not used to determine timing. If all spans on the card
are set to 0, the card will use its internal clock as the timing source.
1, 2, 3, ... - A value greater than 0 will cause the span to attempt to
recover a clock source from the line for the entire card to use as
timing. Since only one source of timing is valid per card, this value
defines a priority that determines which span recovers a clock in the
case that multiple are defined. 1 is the highest priority span, followed
by 2, 3, and so on.
Line Build Out:
For most setups the line build out is 0.
0: 0 db (CSU) / 0-133 feet (DSX-1)
1: 133-266 feet (DSX-1)
2: 266-399 feet (DSX-1)
3: 399-533 feet (DSX-1)
4: 533-655 feet (DSX-1)
5: -7.5db (CSU)
6: -15db (CSU)
7: -22.5db (CSU)
Framing:
T1 utilizes framing set for D4 (SF) or ESF. E1 utilizes CAS or CCS.
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