HDSL4 for General Distribution Installation and Maintenance Practice Specifications61223HDSL4L2-5C 65Table 18 lists the product specifications for each H4TU-R included in this practice.Table 18. H4TU-R Product SpecificationsSpecification DescriptionLoop InterfaceModulation Type:Mode:Number of Pairs:Bit Rate:Baud Rate:Service Range:Loop Loss:Bridged Taps:Performance:H4TU-C Tx Pwr (Data) Level:H4TU-C Tx Pwr (Activation) Level:Input Impedance:Maximum Loop Resistance:Return Loss:16-TC PAMFull DuplexPartially OverlappedEcho Canceling21.552 Mbps261.333 k baudRefer to the “HDSL4 Deployment Guidelines” onpage 55Refer to the “HDSL4 Deployment Guidelines” onpage 55Single Taps < 2 kft., Total Taps < 2.5 kft.Compliant with T1.418-2002 (HDSL4 Standard)14.1 ± 0.5 dBm (0 to 400 kHz)14.1 ± 0.5 dBm (0 to 307 kHz)135 ohmsRefer to the “HDSL4 Deployment Guidelines” onpage 5512 dB (50 kHz to 200 kHz)Network InterfaceDS1 Output Level:DS1 Signal Input Level:DS1 Line Coding:DS1 Framing Format:0 dB, –7.5 dB, –15 dB0 to –22.5 dBAMI, B8ZS (default)AutoPowerTested with the ADTRAN H4TU-C (1223401L2)1223424L21223426L2 Span Powered:H4TU-R Maximum Heat Dissipation:Fusing:–24 to –48 VDCPowered by an H4TU-C module at –190 VDC;Class A2 compliant; current limited at 150 mA4.1 watts1.00 amp (on-board; not field-replaceable)ClockClock Sources:Internal Clock Accuracy:HDSL4 loop derived± 25 ppm (exceeds Stratum 4); meets T1.101 tim-ing requirements
