Instruction manual

HARDWARE DESCRIPTION
CAUTION & WARNING
GROUNDING
LABELS
FCC LABEL BLOCK
SYSTEM 25
VOLTS AC
J58901A
AMPS
HZ
25-PAIR
CONNECTORS
INPUT
ON/OFF
AC POWER SWITCH
RECEPTACLE
Figure 4-2.
System Cabinet (J58901A)—Rear View
Cabinet 1 (Control and Port Circuits)
Cabinet 1 (Figure 4-3) is always required.
It provides mounting space for 12 CPs and can
support a small telecommunications system (for example, 50 to 60 stations and 10 to 15
trunks.)
Cabinet 1 contains the CPU/MEM CP and the Service Circuit, which must be mounted in CP
slots 1 and 2, respectively. Slots 3 through 12 (ten total) provide mounting for the various
port CPs that can be used. Any port CP can be mounted in any of these ten slots.
The Tone Detector and Pooled Modem CPs (referred to as System Resource CPs) can also
be mounted in the port CP slots.
Circuit packs are described in this Section under the
heading “Circuit Packs”.
Cabinets 2 and 3 (Port Circuits)
Cabinet 2 and Cabinet 3 (Figure 4-3) can be added to provide mounting space for additional
port CPs (12 maximum each) required for larger systems. The Tone Detector and Pooled
Modem CPs can also be mounted in these cabinets.
These cabinets are simply stacked on
top of Cabinet 1.
Table 4-A summarizes port CP capacity of 1-, 2-, or 3-cabinet systems.
4-4