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Date Posted: 06:42:18 03/08/02 Fri
Author: Potter
Subject: Re: Info from line 18
In reply to: Kenobi 's message, "Info from line 18" on 09:28:07 03/07/02 Thu

Specific bits there control the invert, attenuation and audio privacy if the CRC is valid eg (extract from giln18a code:-
; GI/Jerrold Data Packet is as follows:
; [Start Bit][ 0 0 0] [CRC 4 Bits] [Audio Privacy Bit] 0 [Invert Bit] [6dB Bit] [10dB Bit]
; Check for valid Start
; Check for Four 0's (mode I believe)
; Store 4 CRC bits
; Store Audio Privacy bit
; Check for 0 bit
; Store Invert, 6 & 10 dB Bits
; Check Stored CRC and mode bits for valid combination
; Valid Mode Change Packets
; Packet St Mode CRC AP ? Inv dB
; 8A18 1 000 1010 0 0 0 11
; 8838 1 000 1000 0 0 1 11
; 8298 1 000 0010 1 0 0 11
; 80B8 1 000 0000 1 0 1 11
; 8B08 1 000 1011 0 0 0 01
; 8928 1 000 1001 0 0 1 01
; 8388 1 000 0011 1 0 0 01
; 81A8 1 000 0001 1 0 1 01
; 8610 1 000 0110 0 0 0 10
; 8430 1 000 0100 0 0 1 10
; 8A90 1 000 1010 1 0 0 10
; 88B0 1 000 1000 1 0 1 10

; Must read in each bit state at 2.2uS/11 instruction cycle intervals
; Read in GI Data and determine validity/mode


>I know what is the info on line 18 but exactly what
>part of that info does the 3 chip use?

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