TXC-04228 28-channel equivalent, e1mx28 device ds1 mapper 28-channel.
* 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 byt.
without need for a framer
* Intel/Motorola-compatible microprocessor interface
* 3-bit RDI support
* Boundar.
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