GAI-Tronics 69255-001 Page/Party Interface PCBA - Manual (Page 2)

Pub. 42004-608L2B
69255-001 Page/Party
®
Interface PCBA Page: 2 of 10
f:\standard ioms - current release\42004 instr. manuals\42004-608l2b.doc
11/10
Functions of Mode One -- Zone Interface
• Performs audio switching to transmit from the 33-ohm page line to one of two 1000-ohm differential
backplane page resources
• Allows page line audio to drive a differential page monitor bus on the backplane
• Provides a 2400-baud FSK modem that operates over the 33-ohm page line
• Detects both Page line and Party line ground fault detection (less than 5000 ohms)
• Detects off hook conditions on both party lines (less than 120-ohms across L1 and L2)
• Allows party line switching from the 33-ohm party lines to the 33-ohm backplane
• Receives one external dry contact closure input
• Provides one output to drive an external relay for special applications
Functions of Mode Two - Control Area
Mode Two includes all of the functions of Mode One excluding FSK communication plus the following:
• Allows the Party Line 1 backplane resource to drive the 33-ohm page line in the control area
• Provides an RS-485 link to external GAI-Tronics modules