Bedienungsanleitung Adtran total access 1500 quad line interface unit (Seite 9 von 14) (Englisch)

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61180019L1-5A Issue 1, May 2004 9

Up to 14 dual LIU systems or 28 single LIU systems

may be daisy chained to a single output from the timing

source. This results in a requirement for only one wire

run from the timing source for an installation of up to 14

or 28 Total Access 1500 shelves. Use wire of the same

type as the wire run from the CO clock source to the

Total Access 1500 19-Inch Chassis. The following steps

provide instructions for connecting multiple Total

Access 1500 shelves to a single external timing source.

1. Determine the length of wire required to run from

the first chassis, connector

P14, to the second chas-

sis, connector

P14. Leave approximately 1 to 1-1/2

inches for wire wrapping.

2. Using wire strippers, strip approximately 1 to

1-1/2 inches from both ends of the wire run.

3. Using a wire-wrap tool, wire wrap the “+”, “–” and

drain wires to the “+”, “–” and ground terminal

pins of connector

P14, Clk out Pri, on the top of

the backplane.

4. Run the wire from

P14 on the “source” chassis to

connector

P14, Clk in Pri, on the “receiving”

chassis.

5. Wire wrap the “+”, “–” of the wire run to the “+”,

“–” terminals of

P14 on the “receiving” chassis.

6. Set

SW3 on the “source” chassis to the IN position,

and Set

SW3 on the “receiving” chassis to the OUT

position.

NOTE

In any daisy chain of Total Access 1500

shelves using a single timing source, only the

first chassis in the chain should have switch

SW3 set to IN. All the remaining chassis in the

chain should have SW3 set to OUT.

7. Repeat steps 1 through 6 for each Total Access

1500 shelf that is to be connected to the single CO

timing source.

8. Repeat steps 1 through 7 for secondary clock.

NOTE

If connecting the secondary clock source, set

SW1 to the SW3 settings.

Figure 7 illustrates a daisy-chained composite clock

configuration.

Composite Clock Output

Because some applications may require the Total

Access 1500 System to provide source timing, an

additional connection is provided on

P12 labeled Local

Clk (+, -)

to provide a 64 kHz composite clock output.

This output clock can be used as a timing source for up

to 14 dual LIU systems or 28 single LIU systems.

Mechanized Loop Testing Connections

A four-lead (T, R, I, and drain) common test access bus

is provided for mechanized loop test access to all

customer loops, labeled

P6 on the backplane. Instruc-

tions for connecting the Total Access 1500 19-Inch

Chassis for mechanized loop test access are as follows:

1. After locating the test loops and running them to

the Total Access 1500 19-Inch Chassis, use wire

strippers to strip approximately 1 to 1-1/2 inches

from the test leads.

2. Using the wire-wrap tool, wire wrap the central

office “T” and “R” leads to the Total Access 1500

19-Inch Chassis

R and T pins, respectively, on

terminal

P6.

3. Wire wrap the inhibit wire of the cable to the pin

labeled

I on P6.

4. Wire wrap the drain wire of the cable to the pin

labeled ground on

P6.

5. Neatly tie down the test cable pair.

Alarm Output Connections

Alarm interpretation is dependent on how the Total

Access 1500 System is configured. When the system is

deployed in a single or dual T1 feed, the SCU should be

provisioned for D4 Conventional Alarm Relay

Mapping. The alarm outputs will be designated as

follows:

• VIS MAJ (Visual Major)

• VIS MIN (Visual Minor)

• AUD MAJ (Audible Major)

• AUD MIN (Audible Minor)

• AUX (Auxiliary)

•PWR

When deployed in a DLC configuration using a quad T1

feed, the SCU can be provisioned for T1 Mapping

which provides the following alarm outputs:

• T1A (A Digroup Major)

• T1B (B Digroup Major)

• T1C (C Digroup Major)

• T1D (D Digroup Major)

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