AT amp T Security System 8300 Installer s Manual Issue 1 3 July 1991 Part Number 846 503 944 CCU Main Board and Display Control Keypad Compatibility Only the enhanced Display Control Keypad can be used with the enhanced CCU Main Board The enhanced CCU Main Board and the enhanced Display Control Keypad provide expanded Listen In Talk Back capabilities described in Appendix D Listen In Talk Back Table 0 1 describes compatibility between the two different versions o
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