ADTRAN TRDDS-R Installation And Maintenance Manual

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ADTRAN TRDDS-R Installation And Maintenance Manual Manual pdf 3 page image

Page 361291021L5-5A Section 61291021L5-5A, Issue 1The unit should be wired as follows:• Network pair to terminal strip TT and TR positions• To Customer and From Customer pairs throughcustomer 8-pin modular connectororTo Customer (DRT, DRR) and From Customer(DTT, DTR) to designated terminal strip positionsNo rate selection is necessary for the TRDDS-R. Theunit automatically adapts to the service rate of the TotalReach dataport in the Central Office (CO).Electrical Code ComplianceTable 2 shows the UL/CUL Telecommunications Codesfor the TRDDS-R. The TRDDS-R complies with therequirements covered under UL 1459 third edition and isintended to be installed in an enclosure with anInstallation Code (IC) of “B” or “E”. The TRDDS-R isintended for installation in restricted access locationsonly.Display IndicatorsThe TRDDS-R contains faceplate-mounted LEDindicators which display the operating status and servicerate. The indicators are described in Table 3.Signal MeterThe TRDDS-R contains a signal meter that approximatesthe amount of dB loss on the TRDDS loop at 13.3 kHz(135 Ω termination), the Nyquist frequency of TRDDS.The signal meter on the TRDDS-R may be used to verifythat the loop loss is actually within TRDDS deploymentguidelines without the requirement of peripheral testequipment. The signal meter is activated automaticallyupon power up during the TRDDS training sequence andremains activated until synchronization occurs (usually30-90 seconds after power-up). For example, if the signalmeter only illuminates the 2.4 LED, then the loop loss istoo great for TRDDS deployment. If the signal meterilluminates 2.4 and 4.8 (only two LEDs), then theTRDDS loop loss is between 50 and 56 dB and the loop isconsidered marginal for TRDDS deployment. If three ormore rate LEDs are illuminated during TRDDS train-up,then the circuit is considered to be within TRDDSdeployment guidelines. See Figure 5 for a translation ofthe signal meter loss ranges in dB. If the loop lossindicates a marginal loop for TRDDS deployment, then amore precise loop loss measurement can be made with theappropriate test equipment.Table 1. Wiring ConnectionsriaPlanimreTpirtSsnoitangiseD004TniPrebmuNremotsuC84JRmorF/oTkrowteNRT,TT 74,14oTremotsuC)xR(RRD,TRD 51,5 8,7morFremotsuC)xT(TTD,RTD 55,94 2,1TUPNI TUPTUOCI A -CT X XCP C CTable 2. UL/CUL Telecommunications CodesFigure 4. Circuit Card Pin Assignments117Frame Ground(TT) (DTT)(TR) (DTR)(DRT)TRDDS-R15 (DRR)11275FromCustomerToCustomerToNetwork41 5547 49