User's Manual

50 MDS Mercury 16E Technical Manual MDS 05-6302A01, Rev. A
expected to make up the majority of the traffic as is the case with VoIP
(Voice over IP).
8.5 Subscriber-to-Subscriber Traffic
When sending frames from an endpoint connected to one Subscriber to
another endpoint with a different Subscriber, the throughput will be
halved at best. This is because all frames must go through the Base Sta-
tion and thus are transmitted twice over the same radio system. There-
fore, in the previous 100-byte UDP example, the number of over-the-air
bytes will be 380 bytes (190 bytes x 2) if the frame has to go sub-
scriber-to-subscriber.
8.6 Interference has a Direct Correlation to
Throughput
Interference could be caused by other radios at the same site, in nearby
locations, or by high power transmitters such as paging systems. Such
interference will have a negative effect on data throughput of the radio
system.
8.7 Placing the Radio Behind a Firewall
Mercury radios use the port numbers listed below. If you place the radio
behind a firewall, make sure these port numbers are included in the
allowed list:
• SSH: 22 <- Management
• TELNET: 23 <- Management
• TFTP: 69 <- Reprogramming
• HTTP: 80 <- Management
• NTP: 123 <- Time server
• SNMP: 161 <- Management
• SNMP-TRAP: 162 <- Event management via traps
• HTTPS: 443 <- Management
• SYSLOG: 514 <- Event management via remote syslog
server
These well-known port numbers follow the recommendation of IANA.
For more information, go to
http://www.iana.org/assignments/port-numbers.