TranSwitch Corporation, Shelton, CT
is ISO 9001 Registered
T1Mx28 DS1 Mapper 28-Channel (TXC-04228)
Summary
The T1Mx28 is a 28-channel byte-synchronous and asynchronous DS1 mapper. Four field-proven DS1MX7 DS1 Mapper chips are interconnected in a single compact package to permit higher application board densities. Both SONET and SDH mappings are provided per Bellcore GR-253-CORE (VT1.5) and ITU G.707 3-96. A single-dual add/drop Telecom Bus is provided that can operate at either 6.48 or 19.44 MHz, which is compatible with other TranSwitch devices. VT1.5/TU-11 pointer tracking and overhead extraction/processing with full error and alarm control is provided. VT1.5/TU-11 pointer calculation and overhead assembly is also provided. Alarm and error mappings from drop to add and SONET/SDH to/from DS1 are provided. Jitter performance is achieved with a fully digital threshold modulator and DPLL that meets GR-253-CORE MTIE requirements without external de-jitter buffers. For the DS1 line, AMI, B8ZS and NRZ line codes are supported with full alarm detection and generation per ANSI T1.231-1997. Each channel is independently programmable for mixed service applications. Access to status and control bits is provided via an Intel/Motorola-compatible microprocessor interface. Diagnostic, test, and maintenance functions are provided, including boundary scan, PRBS generator/analyzer and loopbacks.
Features
Single +3.3 V, +/-5 % power supply
456-lead plastic ball grid array package (35 x 35 mm)
Twenty-eight independent 1.544 Mbit/s DS1 mappers
Single/dual byte-parallel Telecom Bus @ 6.48 MHz (28 slots) or 19.44 MHz (84 slots)
Floating VT1.5 byte-synchronous mapping with signaling only for use with or without a slip buffer
Asynchronous mapping for DS1
SONET mapping (VT1.5) or SDH mapping (VC-4/AU-3/TU-11)
AMI or B8ZS codec for DS1s, or NRZ
Serial I/O for control of DS1 line interface transceivers or framers
Telecom Bus and DS1 loopbacks with integral PRBS generator and analyzer
VT1.5/TU-11 pointer tracking and generation
VT1.5/TU-11 overhead processing and insertion
One-second latched performance registers and counters
DS1 alarm detection and generation
Internal ring port for use as a dual bus 14-channel mapper
Gapped line clock option for Internet applications without need for a framer
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