AT&T AT&T manual System Cabinet J58901A-Rear View

Each cabinet has its own power supply mounted to the left of the CP carrier. The power supply is 3 inches wide and weighs about 9 pounds. Voltage and current supplied to the carrier are: +5 V dc at 35A, -5 V dc at 3A, -48 V dc at 3A, and 90 V ac at 0.16A.

On the front of the supply is a green Light Emitting			Diode (LED)	that, when	lighted,
indicates that the +5 V de is available		and within limits.	The LED can be viewed through
the	slotted area on the front cover, and	is just behind the	fan located at	the top left	edge of
the	cabinet.

Mounted on the back of the cabinet (Figure 4-2)is the copper grounding block with four terminating positions, an AC input power receptacle, a power On/Off switch [(l)=ON, (0)=OFF] and twelve 25-pair connectors. The ground block is connected to DC ground on the carrier backplane at a location near the power supply. The 25-pair connectors provide an interface between cross-connect wiring and the CPs immediately behind each connector. Two slots are provided in the rear cover just above the 25-pair connectors for the Time Division Multiplex (TDM) bus extender cable. The TDM cable is used to connect 2- or 3- cabinet systems together in a daisy-chain configuration and provides control and data signals between Cabinets. The Cabinet 1 ground block is connected to the single point ground of the system using 6 AWG wire. Separate 6 AWG wires are then connected from the Cabinet 1 ground block to Cabinet 2 and 3 ground blocks. The Cabinet 1 ground block is also connected to the Coupled Bonding Conductor. An information label is provided across the top portion of the rear panel on each cabinet. The label provides cabinet identification, input electrical requirements, caution and warning notes, and FCC and UL labels.

CAUTION & WARNING		GROUNDING
LABELS	FCC LABEL	BLOCK

SYSTEM 25 ❑120 VOLTS AC

J58901A ❑6 A M P S

❑60 HZ

❘ ❘ ❘

1 2

1 1

1 0

9

8

7

6

5

4

3

2

1

❍ ❍ ❍ ❍

25-PAIR	INPUT	ON/OFF
CONNECTORS	AC POWER	SWITCH
	RECEPTACLE

Figure 4-2. System Cabinet (J58901A)—Rear View

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