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Configuration
1
This chapter explains how to configure a Strata
system. It also provides space to record the hardware
and station devices that make up the system.
The focus of this chapter is a series of worksheets,
providing a systematic procedure for determining the
system's size. Tables and example worksheets are
also included to assist in filling out the worksheets.
System Capacity and Hardware
Description
1.2
System Configuration
The number of CO lines and stations needed
determine the size of the system. The exact hardware
requirements depend on the features required. The
Strata
can support
a maximum of 240 stations,
and 40 CO lines, or, in a squared system, 144 stations
and 136 lines. Figure
1-1
shows the station and line
capacities for the case of eight-port
CO
line PCBs. There is a trade-off between stations and
lines. Every group of eight stations installed decreases
the CO line capacity of the system by eight, and vice
versa.
Each system contains a base cabinet
The base cabinet has two slots dedicated for the
common control unit and six universal slots, each of
which can support any station or line printed circuit
board (PCB) compatible with the Strata
'system. The base cabinet holds a power supply which
powers all of the devices connected to the PCBs in the
base cabinet. The base cabinet can support as many
as 32 stations and
trunks with any RCTUA
common control unit; with an
RCTUB, or
common control unit, the base cabinet
can support as many as
40
stations and eight lines.
RCTU processors and the
option PCBs must be
installed in dedicated slots of the base cabinet.
As many as five expansion cabinets
or
can be added to the base cabinet to add
more lines and stations to the system. With
software,
and
are
interchangeable and can be mixed in any order. The
expansion cabinet looks almost identical to the base
cabinet. The
contains two universal slots
reserved for future upgrades and six universal slots
that can be used with all
releases.
provides six universal slots that
can be used with
releases;
it also has two additional slots but they cannot be used
with future upgrades.
Like the base cabinet, the expansion cabinet has a
power supply. Each expansion cabinet adds up to 40
DKT or EKT stations and eight lines. All slots may be
used for station or non-station PCBs.
1.3
Common Control Unit
The system operates with one of three common
control units: the RCTUA (1 or 3), the
RCTUB
or 2),
and the
These units consist of a single printed circuit board,
except for the RCTUC (1 or
( I ,
2, or 3), and
which consist of two PCBs.
All
are
installed in dedicated slots in the base cabinet which
are not the six universal slots.
The common control unit selected for the system
depends on the size of the system and the features
required. The RCTUA
or
3)
unit can only support
one cabinet system. The feature capacities are listed
in Table 1-1.
January
1996
1-1
Содержание Strata AirLink DK280
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