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Appendix A Multimegabit HDLC Formatter
A.1 Introduction
The CN8330 was designed as a DS3/E3 framer with both serial and parallel data
inputs. The circuit has an integral High-Level Data Link Control (HDLC)
interface that can be used without the insertion of DS3/E3 overhead bits. This
mode of operation is documented in this Appendix.
The transmitter is capable of formatting byte-organized data from the Payload
Parallel Data Link (PPDL) data port. The parallel data is formatted with idle
flags, zero stuffing for transparency, and a selectable 16- or 32-bit Frame Check
Sequence (FCS) according to ITU-T standard Q.921 or ISO 3309-1984. Options
are provided to allow the formatting of data for packet voice according to ANSI
standard T1.312-1991. Serial data can be transmitted at any rate up to 52 Mbps.
100441E
Conexant
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