DS3 TransMUX (LNW18)

Electrical specification

The TransMUX circuit pack provides 12 ports for DS3 service.

DS3 interfaces transmit/receive a standard electrical DS3 signal as specified in GR-499-CORE, Section 9 (44.736 Mb/s rate, DSX-3 interconnect specification, bipolar 3-zero substitution (B3ZS) encoding).

TransMUX circuit pack DS1 and DS3 signals

Alcatel-Lucent 1665 DMX supports a 12-port TransMUX card that can collect various DS1 signals from around a ring and combine them into a channelized DS3 signal.

The TransMUX circuit pack functions in the following manner:

Transmit functions

• Receives a B3ZS-encoded DS3 signal from a DSX-3

• Recovers DS3 clock and NRZ data

• Calculates parity errors on the DS3 input

• Demultiplexes the M13 or C-bit formatted DS3 signal into 28 DS1s

• Maps the 28 DS1s into VT1.5s and then into an STS-1

• Inserts STS-1 path overhead

• Provides the STS-1 signal to the OLIU circuit packs

Receive functions

• Interprets the STS-1 pointer values

• Terminates the STS-1 path

• Disinterleaves the STS-1 signal into 28 VT1.5s and interprets VT pointer values

• Converts the VT1.5 signals to 28 DS1 signals

• Multiplexes the 28 DS1 signals to an M13 or C-bit formatted DS3 signal

• B3ZS encodes the outgoing DS3 signal

• Pre-equalizes the DS3 signal (with LBO) and transmits it to a DSX-3