Section 5, DLP-014 ATLAS 550 System Manual
356 © 2002 ADTRAN, Inc. 61200305L1-1F
DLP-014
Perform Steps Below in the Order Listed
1. For the alarm relay contacts labeled ALARM, determine whether the external alarm reporting device
uses a normally open (NO) or normally closed (NC) circuit for alarm relay. For the external monitor
labeled RELAY MON, the ATLAS 550 uses a NO 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(s).
3. Using wire strippers, strip 1 inch from both ends of each wire.
4. Remove both terminal blocks.
5. Using the small straight slot screwdriver, loosen the screws in both terminal blocks.
6. For the four-position terminal block, insert one strand into the third slot (counted from the left) for the
COM connection from the ATLAS 550.
7. Insert another strand into either the first slot or the second slot for the NC or NO connections,
respectively.
8. For the two-position terminal block, insert one strand into the first slot (counted from th e left) for the
Alarm Out signal. Insert the other strand into the last slot for the Alarm In signal. Complete this step
only if you wish to have the ATLAS 550 monitor for external alarms.
9. Connect the wires to the appropriate terminals on the external device(s) being used.
Table 1. Alarm Relay Connector Pinout
Pin Name Description
1 Normally Closed (NC) Opens when a selected alarm condition is present.
2 Normally Open (NO) Closes when a selected alarm condition is present.
3 Common (COM) Common connection between external circuitry and NC or NO terminal.
4 Chassis Ground (GND)
NETWORK 1 NETWORK 2
1
2
3
4
ETHERNET
CONTROL
IN OUT
RELAY ALARM
OI
FUSE RATING: 2A/250V SLO-BLO
90-240VAC, 2A, 50/60Hz
NCNO
COMGND
ALL EMPTY SLOTS MUST BE
COVERED WITH BLANK PANELS
CAUTION: FOR CONTINUED PROTECTION
AGAINST RISK OF FIRE, REPLACE ONLY
WITH SAME TYPE AND RATING OF FUSE.
MON
NETWORK
IN
OUT
IN
OUT
NETWORK MON
T1 NETWORK MODULE TEST
500 Series
Alarm Relay
Connection
External Alarm Relay
Monitor Connection
OI
RELAY
MON
ALARM
NC NO
COM GND
12
3
2
14