3Com T1/PRI manual This diagram represents this process

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Configuring Span Lines 1 and 2 2-3

This diagram represents this process.

Encoded HDB3 Signal

Bit Stream

Framer Circuitry

Line Interface Unit

Transformer

Configure the NAC framer to respond or ignore the loop-up/loop-down pattern from the Telco.

Menu Option 4 Configuring the span line’s jitter attenuation

Jitter attenuation on the span line enhances the network interface card (NIC) tolerance to jitter. The NIC’s hardware provides a 193-bit frame buffer to compensate for low frequency jitter on the network.

This option allows you to attenuate jitter on the receiving (from switch to you) and the transmitting (from you to switch) sides. It defaults to the attenuate jitter on the transmitting side.

If you are using the Dual Channelized T1 (386) NAC with a Short Haul (DSX-1) NIC, jitter attenuation is only allowed on the receiving side.

Menu Option 5 Configuring the span line’s transmit line build out

The span line’s transmit line build out is a configurable output attenuation that can be set to satisfy T1 circuit requirements.

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Contents Version Number Dual T1/PRIDual T1/PRI 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Configuring the span line’s interface ID Dual T1/PRI Maintenance Trouble Clearing Page If you are looking for Turn to About this ReferenceFinding Specific Information This ReferenceConventions This table lists conventions used throughout this referenceIcon Description User Interface Supported FeaturesAccessing OverviewCallout # Interface UI console’s main menu Dual T1/PRI ConfigurationConfiguring Span Lines 1Menu Option 1 Configuring the span line’s framing mode Framing mode selects the T1 formatMenu Option 2 Configuring the span line’s line coding Menu Option 4 Configuring the span line’s jitter attenuation This diagram represents this processMenu Option 7 Configuring the span line’s idle bit pattern Menu Option 6 Configuring for the Telco’s switch typeDS0#sl#/ch# Menu Option 8 Mapping the span line’s DS0s to chassis modemsMenu Option 12 Configuring span level cause codes Menu Option 9 Configuring the span line’s signaling channelMenu Option 10 Configuring the span line’s interface ID Menu Option 11 Configuring span level call-type blockingMenu Option 13 Configuring the DS0 level call-type blocking Cause Code Type Default Cause Code Value DescriptionFollowing types of cause codes are supported Menu Option 14 Configuring the DS0 level service state Menu Option 15 Configuring the Short Haul NIC line lengthDSS DS0#, DS0#, DS0#-DS0#,... for multiple DS0s Any changes made will take effect immediately Menu Option 1 Selecting a Gateway to process digital calls ConfiguringInbound Call RoutingPHIDX#ph=PH#,ct=x Configuring inbound call routingIDP# Idpt Use the following syntax to assign a pool type to a pool IDMenu Option 9 Allowing ISDN-GWC termination Menu Option 1 Saving configuration changes to NvramSaved to Nvram will be restored CardMenu Option 4 Assigning timing source priority Menu Option 2 Restoring configuration from NvramMenu Option 3 Restoring the default configuration Menu Option 5 Configuring chassis slot devicesMenu Option 6 Configuring the modem routing method Menu Option 7 Configuring the UI console passwordMenu Option 8 Enabling automatic DS0 state change Menu Option 9 Companding Code Configuration Configuring Software Fault Event LoggingDual T1/PRI Dual T1/PRI MaintenanceCommands Commands and logging out of the user interface UI consoleSelecting option 1 from the main menu produces this screen Menu Option 1 Resetting the highest priority timing sourceMenu Option 2 Resetting the PRI NAC Issuing this command reboots the NACForcing receiver reframe on the span lines Forcing the NAC to master the TDM busMenu Options Connect/disconnect B-channel on span lines 1 Menu Option 11 Disabling red Alarm LEDsChanging individual DS0 service states Changing span line service stateUI Console Command, from the console’s main menuFeature in the card configuration option of the main menu Logging OutFrom the user interface UI console’s main menu Dual T1/PRI Status DisplaysDual T1/PRI Status DisplaysRAM Menu Option 1 Checking power-up self test statusMenu Option 3 Checking chassis slot device configurations No NAC is installed and assigned to that particular slotMenu Option 2 Checking the T1/PRI’s overall status Menu Option 5 Checking the chassis’ Isdn gateway status Menu Option 4 Checking DS0/modem channel statusChecking span line 1 and 2’s DS0 status Time slots are mapped to Checking span line 1 and 2’s alarm/event statusTime slot is available and awaiting a call NetServer PRI NACDual T1/PRI Status Displays 8CHAPTER 4 Dual T1/PRI Status Displays Press Ctrl-Rto reset any of the counters on this screen Trouble clearing information Using the LEDsIndicate line signal conditions Trouble ClearingLayer 2 D-channel Status Alarm Severity ResultLevels CD 1 or Alrm 1 or Lpbk 1 or T1 Condition LED ColorAlarm/Error Level Trouble Clearing Correcting Alarm/Error ConditionsOff and signaling Channel Down Regulatory United States Compliance Technical SpecificationsCertification Current DrawOperating Physical DimensionsEnvironment Shipping and StorageCertification B-1 IndexINDEX-2