AT&T 76450 - Manual (Page 17)

Common Systems Connection Standards AT&T Services, Inc
Date: June 2013
ATT-TP-76450, Issue 15
Copyright © 2013, AT&T . All Rights Reserved.
Page 17
4.6.2 The interface for TL1/SNMP interconnection may be Ethernet RJ45, DB25 or
RS422/449 (37 Pin).
4.6.3 The interface for E2A Serial or Discrete interconnections may be wire-wrap pins or other
non-proprietary connector.
Discrete Alarm Conditions:
4.7 Discrete Alarm Rating
4.7.1 Minimum current carrying capacity - steady state: 0.9 amps at 60 volts for -48 volt
applications.
4.7.2 Minimum current (20 msec. duration) during initial contact closure: 0.9 amps at 60 volts
for -48 volt applications.
Discrete alarm outputs:
4.8 All discrete alarm outputs shall be designed to provide normally open and normally closed
alarm outputs. The use of Form-C relays may be used to provide the normally closed alarm
outputs.
Discrete alarm paired leads
4.9 All discrete alarm outputs shall be paired leads (tip and ring) with no common or shared
return leads.
Discrete alarm dry contacts:
4.10 All discrete alarm outputs shall be electro-mechanical (non-solid state) dry relay contacts
without any type of constant voltage source or current flow present in a normal or failed state.
Housekeeping/Overhead Alarm Inputs:
4.11 All network elements that will be deployed in a Non-TEL Site environment, such as RT,
CEV, Cabinet, etc., that are intended to carry local power and environmental alarms to a
surveillance center must have at minimum sixteen (16) housekeeping/overhead user definable
discrete alarm inputs. Although not required, an Ethernet/DCC access connection to the
overhead for this purpose is strongly desired.