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17 — DNIC and 2B1Q modules
17.1
Understanding DNIC and 2B1Q modules
DNIC and 2B1Q modules are dual-circuit modules that connect to data devices
through DTUs. These modules can be installed in either interface module position on
the Control card.
DNIC modules support remote connections of up to two X.21 or V.35 data devices,
and up to eight EIA/TIA-232 data devices via a 2600 MainStreet series DTU; 2B1Q
modules support up to two EIA/TIA-232, X.21 or V.35 data devices via
2700 MainStreet series DTUs.
DNIC and 2B1Q modules support subrate interface speeds up to 64 kb/s, a super-rate
speed of 128 kb/s (see section 17.11) and multidrop data bridge connections (see
section 17.10).
You must configure a module position for a DNIC or 2B1Q module before you can
configure its circuits.
Procedure 17-1 To specify a DNIC or 2B1Q module
where pp is 1 or 9
17.2
DNIC and 2B1Q circuit configuration and operating
parameters
The circuits on a DNIC or 2B1Q module are numbered A and B. The DNIC module
connects to two-port or eight-port DTUs. The 2B1Q module connects to two-port
DTUs.
When a module is used with a two-port DTU, circuit A communicates with DTU port
A and circuit B communicates with DTU port B. Each circuit (that is, DTU port) can
be configured independently.
When a DNIC module is used with an eight-port DTU, the combined interface speed
of the connected data devices can be less than, equal to, or greater than 64 kb/s. If it
is less than or equal to 64 kb/s, circuit A serves all the devices. If it is greater than
64 kb/s, circuits A and B serve all the devices. In either case, circuit parameters are
configured through circuit B, which sets both DTU ports with the same parameters.
Configuring circuit A parameters has no effect on the connection.
17-2
When you configure a data circuit on a DNIC or 2B1Q
Note —
module, many of the parameters you are configuring are the operating
parameters of the connected DTU.
CONFIG — POSITION — <pp> ↵ — TYPE — DATA
DNIC
2B1Q
2902 MainStreet Technical Practices
90-2906-01
SK000494
May 2002
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