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Adtran total access 1500 Manual

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61180019L1-5A Issue 1, May 2004 5
All permanent connections to the Total Access 1500 19-
Inch Chassis are made on the backplane. Figure 4 is a
detailed diagram of the power and ground connectors,
and Figure 5 is an illustration of the backplane and
pinouts.
Figure 4. Power and Ground Connectors
Frame Ground Connection
The frame ground terminal, located on the upper right
corner of the backplane (see Figure 4 and Figure 5),
should be connected using appropriately sized wire. Use
a wire gauge that is at least the same gauge as the power
wiring.
To make the frame ground connection to the Total
Access 1500 19-Inch Chassis, perform the following
steps:
1. Using the crimping tool, connect an appropriate
lug to each end of the appropriately sized wire.
2. Connect the ground wire from Total Access 1500
19-Inch Chassis ground terminal on
TB1 to the
equipment rack grounding screw.
3. Tighten the ground connection securely with a
straight-slot screwdriver.
Test Frame Ground Connection
To ensure a good ground, use a multimeter to check
continuity between the frame grounding lug and the
rack grounding strap at the top of the rack. Using an
ohmmeter set to its the lowest resistance range, place
one lead on the rack’s ground strap and the other lead on
the Total Access 1500 19-Inch Chassis ground terminal
on
TB1. The reading should be 1 or 2 ohms. Greater
readings should be investigated.
Power Connection
NOTE
Connect to a reliably grounded –48 VDC
source, which is electrically isolated from the
AC source.
NOTE
A readily accessible disconnect device, such as
a rackmount fuse and alarm panel that is
suitably approved and rated, should be incor-
porated in the fixed wiring.
Power connections use a block, labeled
TB1, located on
the upper right side of the backplane (see Figure 4 and
Figure 5). The terminals are on 0.375 inch centers and
allow for wire gauges up to 12 AWG. The frame ground
terminal routes to mechanical contact points and
provides an electrical connection to the chassis
metalwork. The power bus and frame ground route to all
the modules in the chassis.
The number of Total Access 1500 19-Inch Chassis that
can be placed in a 7-foot CO rack depends on the type
of service deployed and the number of access modules
in the chassis.
After connecting and checking the ground to the Total
Access 1500 19-Inch Chassis, connect power to the
chassis. Check to make sure the power source is
providing the correct power and polarity to the Total
Access 1500 19-Inch Chassis. The following steps
provide instructions on how to connect power to the
chassis.
1. Determine which fuse pairs are to supply power to
the Total Access 1500 19-Inch Chassis.
2. Remove the fuses from the A and B slots for the
pair.
3. The power terminal is labeled
TB1. Cut four
lengths of appropriately sized wire to reach from
the terminals on the fuse and alarm panel to the
power terminals on the Total Access 1500 19-Inch
Chassis.
4. Using the crimping tool, connect an appropriate
lug to each end of the wires.
TB1
Pin Number Description
TB1
IN
IN
RTN
RTN
IN RTN
-48V PRI
IN RTN
-48V SEC
… 5 …


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