Subnet Mask; Port Number; Choosing An Ip Address - Extron electronics SMP 351 User Manual

Subnet Mask

The subnet mask is a 32-bit binary number used to "mask" certain bits of the IP address. It
extends the number of network options available for the IP address. The subnet mask does
this by allowing part of the host identifier to be used as a subnetwork identifier.
It is important that the correct value is used for the subnet mask. The value of the
subnet mask is dependent on the IP address class being used. Use the table below and the
table in the
class that matches the IP address class.
Class
Class A
Class B
Class C

Port Number

A port number is combined with the IP address to create an application-specific or
process-specific address. The port number can uniquely identify an application or process
on a computer and thereby enable the computer to share a single ethernet connection
for multiple requirements. A port number is always associated with the IP address of the
computer, as well as the type of protocol used for network communication.
The SMP 351 uses specific ports, but can be configured to meet most requirements. In
addition to the default ports, any port in the available range (1024 to 65535) can be used.
NOTE: Ports previously assigned and currently in use by the SMP 351 cannot be used
again.
All streaming methods (except TS/UDP push) use multiple port numbers. The following
table shows the number of ports used by each streaming method. Archive and confidence
streams have different port numbers.
Unicast (per stream) 4*
Multicast
* 4 ports for "Audio/Video", or 2 ports for "Video only"
When the SMP 351 ports are configured, only the initial port is entered by the user. The
SMP 351 firmware then assigns the multiple port numbers based on the initial port number.

Choosing an IP Address

If the SMP 351 and other devices are connected via an independent network, then follow
the guidelines below when choosing IP addresses. However, if the SMP 351 and other
devices are being connected to an existing network, advise the network administrator and
ask them to assign suitable addresses.
On an independent network, nearly any type of address can be used (in theory).
However, it is generally recommended that class C addresses are used
(192.0.0.1 through 223.255.255.253).
There are two rules for choosing IP addresses:
The network identifier must be the same for each address.
•
• The host identifier must be unique for each address.
Applying these rules to class C addresses, the first three decimal values of the IP addresses
must all be the same, while the last value is used to uniquely identify each device.
"What is an IP Address?" section on page 179 to select the subnet mask
Subnet Mask
255.0.0.0
255.255.0.0
255.255.255.0
RTSP (Pull)
4*
TS/UDP (Push) TS/RTP (Push)
1 2
1 2
SMP 351 • Reference Information
ES/RTP (Push)
4*
4*
180