Features: SpecificationsDescriptionThe TXC-20049D has the following features including Complete B3ZS analog to NRZ digital DS3 line interface unit in a compact 2.6 square-inch module;Analog inputs and outputs are transformer coupled;Speeds time to market for prototype development;Eases parts inventory and acquisition;Eases field maintenance;Meets ANSI Standard T1.102.
TXC-20049D TranSwitch's DS3 Line Interface Module (DS3LIM) is a complete and compact analog to digital interface serving B3ZS encoded DS3 signals. Sensitive analog circuitry provides compliant DS3 specified performance in signal recovery and transmission. With the module's platform design, engineers are freed from the laborious tasks of schematic capture, component placement, and trace routing. This results in a "single PASS" for printed circuit board design of the DS3 analog section.Accumulative reduction in design time, design parts acquisition, unit building and testing mean an efficient format for reducing product time to market.The incoming data is encoded by the B3ZS encoder. In the B3ZS line code, each block of three consecutive zeros is removed and replaced by either of two codes that contain bipolar violations. These replacement codes are BOV and OOV, where B represents a pulse that conforms to the bipolar rule and V represents a pulse violating the rule. The choice of these TXC-20049D codes is made so that an odd number of bipolar conforming pulses (B) is transmitted between consecutive bipolar violation pulses (V). The encoded data is connected to the Transversal Filter Block.
Requirements on input jitter tolerance are specified in terms of compliance with a jitter mask, which represents a combination of points. Each point of TXC-20049D corresponds to minimum amplitude of sinusoidal fitter at a given fitter frequency which, when modulating the signal at an equipment input port, results in two or fewer errored seconds in a 30-second measurement interval. Bellcore Technical Reference TR-TSY-000499, Issue 3, December 1989 specifies the minimum requirement mask for Category II equipment.
TXC-20049D Data Sheet
