Network Traffic Analysis - Crestron RoomView Reference Manual

Crestron RoomView
Reference Guide – Doc. 6133

Network Traffic Analysis

Crestron's RoomView software reports facility wide audio, video, and room
status via an Ethernet infrastructure and TCP/IP communications. The presence
of these TCP/IP packets will introduce a negligible load on the network of a
typical facility when RoomView is running. Even large-scale integrations with
many control systems will not add a significant network traffic load since
packets are sent periodically, not continually.
The following scenario demonstrates an approximate network load introduced
by RoomView communicating to one control processor over a period of one
hour. Each packet is approximately 12 bytes unless otherwise noted.
Room Connection Request – Upon start-up of RoomView software, a
connection request is generated from RoomView to the room control system
totaling 24 bytes.
Room Update Upon Initial Connection - After connection, a single packet is
sent from RoomView to query the current status of all room variables. The
result is a maximum of five return packets, totaling 72 bytes. From this point
forward, any data transmission to update these variables is event driven from the
control system. Therefore it is sent in real time when the event occurs, resulting
in a 12-265 byte message for each event. A typical event would be represented
by a function such as the user in the room pressing the "Help" button on a touch
panel.
Room Connection Monitoring - While a room is connected, RoomView sends
a single packet "ping" signal to the control system every five seconds. This
packet does not generate a response unless the TCP/IP message is rejected.
Therefore the traffic generated with this function is 144 bytes per minute, or
8640 bytes/Hour for each room control system defined in RoomView.
Display Status Reporting – In order to keep the Display Status bargraph in
synch with its respective room display device, a single packet is sent from the
control processor to RoomView for the display usage once an hour totaling 12
bytes/Hour.
Results - The sum of all these events is 8748 bytes over one hour. This
calculation is for the automatic events controlled by the software, and does not
include events invoked by an operator in a room, or the operator of RoomView.
The largest possible packet would be invoked by a help request containing a
serial string of 255 characters, resulting in a packet that would total
approximately 265 bytes.
Software
Crestron RoomView • 51