AT&T 76450 manual Tbos/Tabs

Page 15

Common Systems Connection Standards

AT&T Services, Inc

Date: August 31, 2007

ATT-TP-76450, Issue 9

 

 

 

 

 

(TBOS/TABS)

 

 

 

E2A Discrete

Least Preferred

 

Footnote: A discrete telemetry interface may be provided, on an optional basis, in addition to higher level interfaces, to provide a summary of alarm and status information for remote surveillance.

4.6 Alarm Interconnection:

Each NE in a bay shall produce its own unique set of alarm outputs. Pre-designed “busing” of alarms or alarm leads within a bay is at the discretion of AT&T and shall not be mandated by the equipment design.

•The interface for TL1 interconnection may be Ethernet RJ45, DB25 or RS422/449 (37 Pin).

•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

Minimum current carrying capacity - steady state: 0.9 amps at 60 volts for -48 volt applications.

Minimum current (20 msec. duration) during initial contact closure: 0.9 amps at 60 volts for -48 volt applications.

4.8 Open discrete alarm outputs

All discrete alarm outputs shall be designed to provide both normally open (closed when corresponding

failures are declared by the system) and normally closed (opened when corresponding failures are declared by the system) alarm outputs. The use of Form-C relays may be used to provide this capability.

4.9Discrete alarm paired leads

All discrete alarm outputs shall be paired leads (tip and ring) with no common or shared return leads.

4.10Discrete alarm dry contacts

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.

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Contents Canceled/Superseded Doc N/A Pre-assembled versus Field Assembled Network Equipment RequirementsPurpose ScopeAdditional AT&T Requirements ATT-TP-76450 Internet Web Site Product Evaluation ProcessAdherence to AT&T Standard Suppliers Reasons for ReissueNominal -48v DC AC Powered EquipmentRedundant Power Feeds Power FeedsList 1X Drain Battery Return ConductorDrain Definitions List 1 DrainLocation of Power Terminations 1 16 AWG Stranded Power Cable and LargerTwo Hole Connections 3 18 AWG Power Cable and Smaller Visual Power Alarms and Status IndicatorSize conductor Acceptable termination Associated Listings Power Distribution Delivery Fusing of CapacitorsNE Integrated Power Distribution Direct Bdfb Power DeliveryIndividually Mounted PDU Standards Redundancy of timing inputs Synchronization/Timing Standards Termination of timing leads Clock output lead cablingOutput card exhaustion AlarmsTL1 / TCP-IP TBOS/TABS Fiber Attenuators FiberSee Figure Copper DS1 Cross-Connect Wire Central Office Copper Wire and Cable Softcopy Documentation Vendor DocumentationUnusual Cable Types Protection of Cable and JumpersPersonnel Injury and Equipment Damage Warnings Alarm/Trouble Shooting GuideHard Copy Documentation Craft Interface InstructionsRevision History Consistent Terminology throughout DocumentationConsistent Terminology between Documentation and Platform Revision NumberingTest Streaker Cards Other interconnection requirementsList of Documentation Equipment lightingAppendix a ATT-TP-76450 Checklist Instructions and Process InstructionsProcess Page Power Interconnection Standards Alarm Standards Part & N/A Footnotes Rqmt# Comment Vendor DocumentationDocument Number Document Description Appendix C ReferencesAppendix E Acronyms Appendix D ATT Contact List
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