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17 — DNIC and 2B1Q modules
3
Set the interface speed.
The interface speed must be a whole number multiple of the transport bandwidth.
For DNIC and 2B1Q modules, this means the transport bandwidth is 64 kb/s and
the interface speed is 128 kb/s.
Procedure 17-10 To configure transparent rate adaption
CONFIG — CIRCUIT — <pp-A> ↵ — FUNCTION — RATE ADAPT — METHOD —
TRANSPAREN
where pp is 1 or 9
Procedure 17-11 To set the transport bandwidth
CONFIG — CIRCUIT — <pp-A> ↵ — FUNCTION— RATE_ADAPT — TRANSP_BW — <8> ↵
where pp is 1 or 9
Transport bandwidth is configured in 8 kb/s blocks, where transport bandwidth =
m x 8 kb/s (m is a multiplier). Since the transport bandwidth for DNIC and 2B1Q modules
is 64 kb/s, m = 8.
Procedure 17-12 To set the interface speed
CONFIG — CIRCUIT — <pp-A> ↵ — FUNCTION — RATE_ADAPT — I/F_SPEED — <128> ↵
where pp is 1 or 9
17.12
Loss-of-synchronization debounce time (DNIC only)
DNIC modules, as well as 2600 MainStreet series DTUs, use debounce timers to
distinguish loss of synchronization from random line noise.
DTU debounce
When synchronization between a DNIC module and a DTU is lost, the DTU
automatically resets. This corrects any DTU hardware or software problems that can
be fixed by initializing and reconfiguring the DTU. DTUs with firmware IDs at or
greater than those listed in Table 17-5 have debounce times of 2000 ms. DTUs with
IDs lower than those listed in Table 17-5 have lower debounce times. These times
cannot be configured.
17-14
2902 MainStreet Technical Practices
90-2906-01
May 2002
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