ADC HDSL4, H4TU-C-319 List 1 Line Unit user manual DS1/DSX-1 24-Hour PM Threshold, Parameter

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Provisioning

LTPH-UM-1031-03, Issue 3

 

 

Alarm Pattern (ALMP) Option. To improve HDSL4 compatibility with the switch-to-protect features used in Digital Loop Carrier (DLC) feeder applications, the H4TU-C-319 has an ALMP option that allows you to select either an AIS or LOS DS1 output payload for the following alarms:

LOSW on any loop

LOS DS1

Bipolar Violation Transparency (BPVT) Option. The H4TU-C-319 improves compatibility with Digital Loop Carrier (DLC) feeder applications because of its ability to transmit DS1 BPV occurrences between its DS1 interfaces. This feature is required to support protection switching in DLC applications. Each DLC terminal must be able to monitor the integrity of its Receive DS1 payload and then switch to the protect line when the integrity of the path drops below specific user selected limits. An essential requirement of this feature is the need for each DLC terminal to detect BPVs in its DS1 input. Standard HDSL systems correct DS1 BPVs at the input and, therefore, prevent them from being detected by the DLC terminals to which they are connected. The H4TU-C-319 and its associated remote units remove this limitation and become BPV transparent by detecting and counting input BPVs at each end and then by replicating them at the DS1 output port of the distant end.

The BPV count is converted into BPVs at the distant end during the following second at a rate of 1 BPV every 128 DS1 bits up to a maximum of 12000 (BER=7.7 x 10-3). This maximum rate is more than adequate since it exceeds the maximum 10-3BER required by most DLC systems.

DS1 Bit Error Rate (DBER) Option. The DS1 BER alarm occurs when any of the DS1 or DSX-1 performance monitoring parameters listed in Table 7 exceed the counts shown for the 24-hour period between 12:00:00 AM through 11:59:59 PM. These thresholds correspond to a 10-6BER. All PM counters clear to zero at 12:00:00 AM or when Master Clear is selected.

Table 7. DS1/DSX-1 24-Hour PM Threshold

Parameter

Threshold Count

 

 

CV-L (BPV)

133,400

CV-P (CRC)

132,960

CV-P (FE in SF)

691

ES-L, ES-P, PRM-NE, PRM-FE

648

SES-L, SES-P

100

UAS-P, UAS-L

10

 

 

Power Back Off (PBON and PBOC) Options. Power Back Off Network (PBON) and Power Back Off Customer (PBOC) allow the HDSL4 circuit to support two transmit power templates: default (DEF), higher level, and enhanced (ENH), lower level. These are defined in the four-wire section of the ANSI T1.418 Issue 2 HDSL2 standard. Each HDSL4 receiver detects the level it is receiving during the start-up, pre-activation sequence. It then compares this level to the level it should be receiving according to the PBON and PBOC option settings (DEF or ENH). If the received level is outside the template limits, the receiver sends a message to the upstream HDSL4 transmitter requesting the proper level. These levels are adjusted only during the start-up routine or if the PBON or PBOC option settings are changed during normal operation. Since the ENH template levels are up to 15 dBm below those of the DEF template, the ENH setting can be used to reduce crosstalk levels into adjacent circuits. (For example, if crosstalk noise is being induced by the H4TU-R, set the PBOC option to its lower (ENH) level setting. Conversely, if the HDSL4 signal at the H4TU-R is being affected by crosstalk noise induced from adjacent pairs, set the PBOC option to its higher (DEF) level setting.

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September 12, 2003

H4TU-C-319 List 1

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Contents HDSL4 H4TU-C-319 List 1 Line Unit2001 Initial release March 15 IssueDate Revisions Made September 12Using this Manual Inspecting ShipmentInspecting Shipment Table of Contents Appendix B Functional Operation Config Menu List of FiguresNavigational Keys for the Maintenance Terminal Screens List of TablesFeatures OverviewApplications Front Panel H4TU-C-319 List 1 Front PanelBRG Front-Panel Feature FunctionFront-Panel Description LineFront-Panel Display Messages Message Full Name DescriptionDiagnostic Messages Loopback MessagesSystem Information Messages a Code Line Code AMI, B8ZS Marg Margin Current margin threshold setting measured in dBFRM Frame SF, ESF, Unfr Substitution B8ZSInstallation Installing the H4TU-C-319 List 1 into a ShelfVerification Verification without a Downstream DeviceVerification with a Downstream Device Using the Mode and SEL Pushbuttons Setting Options through Mode and SELProvisioning Disabling an Alarm Resetting to Factory DefaultDisplaying System Parameter Settings Loopback ModesNavigational Keys for the Maintenance Terminal Screens Using a Maintenance TerminalConnecting to a Maintenance Terminal Logon ScreenPress this key Menu FunctionsPress this key To access this menu Menu Functions Setting Date and Time Provisioning TasksSetting Circuit ID Numbers Inventory ScreenConfiguring the System Config MenuConfig Menu Standard Options defaults shown 38 dB H4TU-C-319 List 1 Standard Config Menu Options60 min AutoDIS H4TU-C-319 List 1 ADC Config Menu OptionsADC Config Menu Screen Selection Description Options DEFLpbk HDSL4 BER HberNone ALM ENADS1/DSX-1 24-Hour PM Threshold ParameterResetting to Factory Defaults Clearing the History, Alarm, and Event Log Screens Config Menu Master ClearUsing the Monitor Screen to View System Activity Monitoring System Activity and PerformanceSystem Overview Monitor Screen Descriptions Field DescriptionMAL Insl LPFPRM Using the Performance Screens to View Performance Data Performance History at the DS1 InterfaceH4TU-C DS1 25-Hour Performance History H4TU-R DS1 Current Statistics Acronyms Used on the DS1 Performance History Screens Acronym DescriptionPerformance History at the HDSL4 Interface H4TU-C Hdsl Loop 1/Loop 2 31-Day Performance HistoryH4TU-C Hdsl Loop 1/Loop 2 25-Hour Performance History UAS Acronyms Used on the HDSL4 Performance History ScreensSES LoswsUsing the Performance Screens to View Alarm Data Alarm History at the DS1 InterfaceRAI Rrai Screen Alarm Front-PanelDescription H4TU-C DS1 Alarms onH4TU-R DS1 Alarms on this PRM-NE PrmnAlarm History at the HDSL4 Interface HDSL4 Alarms at the H4TU-C onlyUsing the Event LOG to Track System Events System Event LogEvent Log Entry Messages List Event Log MessagesPRM-FE Using the Report Menu Report Menu Full ReportReport Types Type Contains the following informationFront-Panel System Alarms TestingSystem Alarms Front-Panel Alarm Description To Inhibit Message aFront-Panel Alarm Description PrmnAlarm Option for DLC Feed Retiring System AlarmsOCT55 Test Pattern with AMI Line Code Remote LOS and AIS ResponseLoopback Operation Loopback SummaryGeneric Loopback Commands Special Loopback CommandsSetting the Loopback Time-Out Option Lbto Manual Loopback SessionLoopback Test Procedures General Troubleshooting TipsLoopback Modes Loopback Code Description Test Set Craft Port Gnlb Test ProceduresSummary of HDSL4 Loopback and Activation Codes MODE/SELA3LB Test Procedure A3LB Addressable Repeater Loopback CommandsName A5LB Test Procedure A5LB Addressable Repeater Loopback CommandsTesting LTPH-UM-1031-03, Issue Bert Signal Pattern Testing with H4TU-C Bert GeneratorBert Signal Generator Option DescriptionTesting with H4TU-R Bert Generator H4TU-R Bert Generator ScreenAppendix a Specifications HDSL4One-way DS1 Delay 700 µs Wander Looped SystemWideband Jitter Looped UI maximum Narrowband Jitter Looped Power Consumption Maximum Power DissipationH4TU-C Power Parameters Loop ATTENUATION, Insertion LOSS, and Reach HDSL4 Reach ChartMaximum Current Drain 196 KHz dB/kftFuse Alarm Network Management Control BusSystem Alarm Output Pin Craft PortAppendix B Functional Operation Ground Fault DetectionSpectrum Issues TimingAppendix C Compatibility Systems Integration Appendix D Product SupportSales Assistance Online Technical Support Online Technical PublicationsAppendix E Abbreviations Lbpv LaisLatt LbtoLTPH-UM-1031-03, Issue Certification and Warranty FCC Class a Compliance Limited WarrantyWorld Headquarters For Technical Assistance