Hardware Configurations
2-1Multi-Carrier Cabinet
2
DEFINITY Enterprise Communications Server Release 7
Maintenance for R7r
555-230-126 Issue 4
June 1999
2
Hardware Configurations
The DEFINITY System supports a variety of configurations consisting of a PPN
and up to 21 EPNs. In addition, the system may use a Center Stage Switch (CSS)
consisting of one or two Switch Nodes. This c hapter describ es the PPN and EPN
cabinets, and the c onfiguration of carriers and circuit pac ks within these
cabinets.

Multi-Carrier Cabinet

The Multi-Carrier Cabinet (J58890A) accom modates from one to five circuit p ack
carriers, and is always used for the PPN. EPNs may use either multicarrier
cabinets or single-c arrier cabinets.
The power unit in the bottom of the MCC cab inet supplies AC voltag e or DC
voltage from an external source to the p ower supply in each c arrier. The AC
powered cabinet op tionally contains a batte ry charger and b ackup batteries to
provide temporary p ower to the cabinet if the extern al source fails. The backup
unit is optional for systems powered from an Uninterruptible Power Supply (UPS).
The fan unit in the middle of the cabinet c ools the carriers. AC-powered cabinets
have two 120V AC receptacles in the ba ck for use as an AC power source. These
can be used to powe r the G3-MT.
Each cabinet must be c onnected to one of the following dedicated power
sources:
■120V AC 60 Hz at 50A from a National Electrical Manufacturing
Association (NEMA) 5-50R power outlet or equivalent
■Single phase 240V AC, or three phase 208V AC, 60 Hz at 30A from a
NEMA L 14-30R power outlet or equivalent