User's Manual

User’s Manual for Node C Network Elements
Page 82
M0121A1A_uc.doc
5.3.6 Distribution & Alarm Board
The distribution & alarm board of the Interface Unit is the main connection point for
the user. It has the external alarm clamps, RS232 connectors, for local or modem
connection, as well as a summary alarm relays. The following figures show one blank
board and an installed one with battery backup.
figure 5-15 Distribution & alarm board
* Only these connectors are for general customer use. All others are designated above for
informative purposes, and required, only, e.g. for an upgrade or replacement of parts.
Battery charge module
Internal I
2
C
Power supply alarming / I
2
C
Remote (RS232)*
Internal PSTN connector
External alarms & PSTN *
Door switch
Summary alarm*; see chapter
5.2.7 for pin assignment
Local (RS232) *
Battery backup connector
Vdc for modem *
USB connector for modem*
Mains surveillance
Battery load discharge (resistor)
Modem fuses (2.5 A)
Modem cable (RF connection)