Instruction manual

HARDWARE DESCRIPTION
The cabinets have a brown front cover with beige top and sides. The front cover has a
system identification stripe across the top.
The top has four indentations to facilitate the
stacking of cabinets.
Each cabinet is constructed of sheet metal and is 13 inches high, 17 inches wide, and 21
inches deep and weighs about 75 pounds fully loaded.
A 3-cabinet system occupies a
vertical space of about 40 inches.
It is recommended that the cabinets be placed on a desk-
or table-top. They must not be placed on a floor where cleaning solutions and dirt can get
into them. Refer to Section 6,
“Environmental Requirements” for equipment area
considerations and associated floor plan recommendations.
The front cover of the cabinet is secured by four screws. These screws must be loosened
slightly before the cover can be removed.
When the cover is removed, access is provided to
the CPs, a replaceable air filter mounted just under the CP carrier frame, and two cooling
fans. The cooling fans are mounted on an assembly that, when unscrewed, provides access
to the power supply. Air intake is at the bottom of the cabinet and exhaust is vented at the
left side of the front cover.
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 dc 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 aluminum grounding block with four
terminating positions,
an ac input power receptacle, a power On/Off switch [(1)=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 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 Cabinets 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, CSA, and UL labels.
4-2