Specifications

Engineering Guidelines
34
AX Controller ONS port limitation
You can install up to twelve 24 Port ONSP cards in the AX Controller to provide up to 288 ONS
ports. However no more than 150 of the ports can be in an active call state at any given time,
and this limit may be dynamically reduced further if some of the users are on long loops (anything
greater than 1.1 mile or 1.7 km on 24 AWG cable). Any users beyond the allowed maximum
who attempt to originate a call receive silence (that is, no dial tone). Users attempting to place
a call beyond the allowed maximum to a circuit on the AX controller receive error tone and the
call is not completed.
In addition to the off-hook limitation, there are limits to the number of lines that may be ringing
at any given time, both on each individual line card (3 maximum on 4 brush cycles = 12 total)
and on the overall system (24 maximum on 4 brush cycles = 96 total). This ringing limitation
also applies when the 24 Port ONSP card is used in the ASU II, but the port usage limitation
above does not.
The maximum number of ONS MWI lamps which can be activated on an AX is 288 (i.e. all of
the lines), but this will be reduced in practice by a complex algorithm relating the total number
of ONS sets in Off-hook, ringing, or message waiting state. This limitation should be considered
especially for installations which are planning to use broadcast messages. For more
information, contact Professional Services or Sales/System Engineering.
MMC modules
(installed slots)
Quad DSP (int, ext)
Echo Canceller (int, ext)
Dual T1/E1 (ext)
T1/E1 Combo (ext)
Quad BRI (ext)
Dual FIM (ext)
DSP II (int, ext)
Modules may be installed in the internal or external locations
as shown.
Digital links 2
Peripheral cabinet 0 Not supported.
R2 NSU 2 Up to two R2 NSUs. Other types of NSUs are not supported.
DSU cabinet 0 Not supported
Table 9: Maximum AX configuration (continued)
Feature /
Resource
Value / Quantity Notes
Page 2 of 2