Management Interface
The management interface provides information about the local and remote
frame sync loss and can be used to set the device to dual loop back mode.
Front Panel
The Front Panel gives information about the actual status of the equipment
including power, optical and E1 line status.
Operation
The E1 line interface receives the G.703 data, recovers the clock from the signal,
decodes the data and detects AIS or BPV errors. The recovered clock and data
then passed to the CPLD logic. This programmable electronics receives the E1
data and clock and the service channel data, multiplexes them into a 2.5 Mbps
synchronous data stream. This data stream is then encoded for optical
transmission and passed to the FO transmitter, which converts the electrical
signals to optical. In the opposite direction the optical signal is received by the
FO receiver, converted to electrical and transmitted to the CPLD block. The
CPLD decodes the data stream, demultiplexes it and sends the E1 data and the
recovered clock to the E1 line interface. The service channel data is passed to
the service channel module. The E1 line interface module encodes the data
received from the CPLD block using AMI or HDB3 coding and transmits the E1
signal out to the G.703 port.
