MJ1440

The MJ1440 is an encoder/decoder for the pseudoternary transmission code, HD83 (CCITT Orange Book Vol 111.2 Annex to Rec. G703). MJ1440 encodes and decodes simultaneously and asynchronously. Error monitoring functions are provided to detect violations of HDB3 coding, all ones detection and loss of input (all zeroes detection). In addition a loop back function is provided for terminal testing.

The MJ1440 has the following features include:(1)HDB3 Encoding and decoding to CCITT rec G703;(2)asynchronous operation;(3)simultaneous encoding and decoding;(4)clock recovery signal generated from incoming HDB3 data;(5)loop back control;(6)HDB3 error monitor;(7)'all ones' error monitor;(8)loss of input alarm (all zeros detector);(9)decode data in NRZ form.The 2.048 MBit PCM signalling circuits comprise a group of circuits which will perform the common signalling and error detection functions for a 2.048 MBit PCM transmission link operating to the appropriate CCITT recommendations.The circuits are fabricated in N-channel metal gate MOS and operate from a single 5 volt supply, relevant inputs and outputs are TTL compatible.

The absolute maximum ratings of the MJ1440 are:(1)supply voltage:5±0.25V;(2)ambient temperature:0 to +70;(3)max junction temperature range:175.The products described in this document are designed, developed and manufactured as contemplated for general use, including without limitation, ordinary industrial use, general office use, personal use, and household use, but are not designed, developed and manufactured as contemplated (1) for any use that includes fatal risks or dangers that, unless extremely high safety is secured, could have a serious effect to the public, and could lead directly to death, personal injury, severe physical damage or other loss (i.e., nuclear reaction control in nuclear facility, aircraft flight control, air traffic control, mass transport control, medical life support system, missile launch control in weapon system), or (2) for any use where chance of failure is intolerable (i.e., submersible repeater and artificial satellite).

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