Bedienungsanleitung Adtran total access 1500 dual ds0 dp (Seite 5 von 14) (Englisch)

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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

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

RTN

IN RTN

-48V PRI

IN RTN

-48V SEC

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