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Contextual Info: 257AL Transm it Form atter Features • 2-, 4-, 16-state signaling or inhibit signaling ■ Variable F-bit and parity-bit delays ■ Selectable DS1 1.544 Mb/s or CEPT (2.048 Mb/s) formats ■ TTL-compatible Description The 257AL Transmit Formatter integrated circuit converts 14 bits of parallel data (8 traffic bits, 5