Architecture 983The receiver extracts data and clock from an AMI (Alternate Mark Inversion)coded signal and outputs clock and synchronized data. The receiver issensitive to signals over the entire range of cable lengths and requiresno equalization. The clock and data recovery meets or exceeds thejitter specifications of the CCITT recommendation G.823 and the jitterattenuation requirements of CCITT recommendation G.742. This providesjitter attenuation increasing from 0 dB to 60 dB over the frequency rangefrom about 6 Hz to 6 KHz.The receiver extracts data and clock from an AMI (Alternate Mark Inversion)coded signal and outputs clock and synchronized data. The receiver issensitive to signals over the entire range of cable lengths and requiresno equalization. The clock and data recovery meets or exceeds the jitterspecifications of the CCITT recommendation G.823 and the jitter attenuationrequirements of the CCITT recommendation G.742. This provides jitterattenuation increasing from 0 dB to 60 dB over the frequency range fromabout 6 Hz to 6 KHz.Transmitter functionsThe transmitter takes the binary (dual unipolar) data from the PCMtransceiver and produces bipolar pulses. This conforms to CCITTrecommendation G.703 pulse shape.The transmitter takes the binary (dual unipolar) data from the PCMtransceiver and produces bipolar pulses which conform to CCITTrecommendation G.703 pulse shape.The transmitter takes the binary (dual unipolar) data from the PCMtransceiver and produces bipolar pulses. This conforms to CCITTrecommendation G.703 pulse shape.LoopbacksThe remote loopback function causes the far-end device to transmit thesame data that it receives, using the jitter attenuated receive clock. The datais additionally available at the far-end receive data outputs. Local loopbackcauses the transmit data and clock to appear at the near-end clock andreceive data outputs. This data is also transmitted on the line unless anAlarm Indication Signal (AIS) is transmitted instead.The remote loopback function causes the device to transmit the samedata that it receives using the jitter attenuated receive clock. The data isadditionally available at the receive data outputs. Local loopback causesthe transmit data and clock to appear at the receive clock and data outputs.This data is also transmitted on the line unless transmit AIS is selected.Nortel Communication Server 1000Circuit Card ReferenceNN43001-311 01.04 StandardRelease 5.0 23 May 2008Copyright © 2003-2008, Nortel Networks.
