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9 61180001L1-5B Section 61180001L1-5 Issue 2

Connecting Alarm Outputs

Depending on the vendor equipment employed at the

CO, wiring external alarms from the Total Access

1500 shelf will vary slightly. The important

consideration is whether the external alarm equipment

requires a Normally Open (NO) or Normally Closed

(NC) circuit to pass an alarm. After determining what

the CO equipment requires, connection can be made to

the equipment from the Total Access 1500 shelf, see

Figure 5 for location of alarm contacts. The following

steps are instructions for connecting alarm outputs to

the Total Access 1500.

NOTE

Each three-pin alarm header is wired the same

way for the specified alarm.

1. Determine whether the external alarm reporting

device uses a normally open or normally closed

circuit for alarm relay.

2. Using standard telco cross connect wire,

determine and cut the length required to reach

from the alarm headers to the alarm-reporting

device.

3. Using wire strippers, strip 1 to 2 inches from both

ends of the wire.

4. Using a wire-wrap gun, wire-wrap one strand to

the center pin (common) from the Total Access

alarm relay header, and the other strand to either

the “NO” (normally open) or “NC” (normally

closed) pin on the relay header.

5. Connect, using wire-wrap or lugs, as appropriate,

the two wires to the appropriate terminals on the

external alarm relay device being used.

Connecting Miscellaneous Alarm Inputs

There are four external alarm inputs that can be

reported to the SCU on the Total Access 1500 shelf.

These are marked ACO, RMT, AUX and AUX2, see

Figure 5. Terminal B supplies a -48 Vdc source.

Terminal A expects -48 Vdc if an alarm condition

exists on the alarmed equipment.

The following steps should be used to connect an

external alarm input to the shelf:

1. Using a #1 Phillips-head screwdriver, remove the

long, thin metal guard if it is not already off.

2. Choose an alarm header set from block, P14, on

the top of the Total Access 1500 backplane.

3. Using standard telco cross connect wire,

determine and cut the length required to reach

from the alarmed piece of equipment to the header

you chose. Allow length for 1 to 2 inches of

stripped wire for wire-wrap, and neat routing out

from the Total Access 1500 shelf.

4. Using wire strippers, strip 1 to 2 inches from both

ends of the wire.

NOTE

Omit step 5 if the alarmed piece of equipment has

its own source of -48 Vdc and does not need the

-48 Vdc feed from the Total Access 1500 shelf.

The Total Access 1500 shelf expects to see -48

Vdc on pin A of the alarm pair when an alarm

condition exists.

5. Using a wire-wrap gun, wire-wrap one wire to the

B pin of the Total Access 1500 AUX1 header

(P14), and the other end to the alarmed unit alarm

terminal marked “B.”

6. Wire-wrap one end of the second wire to the A

pin of the Total Access 1500 alarm header (P14)

and the other end to the appropriate equipment

alarm terminal.

7. Using a #1 Phillips-head screwdriver, replace the

long thin metal guard using the screws provided.

NOTE

Check with the equipment manufacturer for exact

alarm markings.

Figure 5. Alarm Contacts

VMJ (T1A)

NO COM NC

VMN (T1B)

NO COM NC

AMJ (T1C)

NO COM NC

AMN (T1D)

NO COM NC

AUX (BANK)

NO COM NC

-48

ALM

P13

Alarm Outputs (P13)

Pin Number Description

1 VMJ (T1A) NO

2 VMJ (T1A) COM

3 VMJ (T1A) NC

4 VMN (T1B) NO

5 VMN (T1B) COM

6 VMN (T1B) NC

7 AMJ (T1C) NO

8 AMJ (T1C) COM

9 AMJ (T1C) NC

10 AMN (T1D) NO

11 AMN (T1D) COM

12 AMN (T1D) NC

13 AUX (BANK) NO

14 AUX (BANK) COM

15 AUX (BANK) NC

16 -48ALM

17 GND

1 2 3 4 5 6 7 8 9 10 11 12

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