Rev. B
3-17
HMXMC001013
31-Mar-06
3.7 NETWORKING
AND
TRUNKING, CONTINUED
Figure 3.13: Example Of Three Video Systems Networked Together
Some important notes regarding the above example;
•
A single bi-directional RS-232 data connection between the main system node and
each of the satellite system nodes.
•
Each satellite system node is providing two (2) only video trunk lines back to the
main system.
•
The VCR connected to satellite system (node #2) can also be viewed and controlled
from the Main System (node #1).
•
The Door control connection to satellite system (node #3) can also be operated
from both the main system (node #1) and satellite system (node #2).
•
The door status would also be available for conditional testing, in the macro
programming environments of all three video system nodes.
•
Other internal system status is also provided to all system nodes. These include
camera fail alarms, PTZ site fail and tamper alarms, VCR alarms, time and date
synchronization and system resets.
Congestion Management
As mentioned above, trunk congestion is usually managed based on the individual
operator priorities. When all available trunk lines are already being used, trunk lines
would be automatically STOLEN from other operators of lower priority. Alarm activated
macro sequences have the highest priority (higher than all operator).
