GE MDS SD Series Reference Manual page 75

MDS 05-4846A01, Rev. C
NOTE: To make use of this feature, the radio must be properly autho-
rized for Ethernet data. If it is not, contact your sales represen-
tative for further information.
It is helpful to understand that IP data is terminated at the radio, yet the
payload data is transmitted OTA. As such, the radio acts as a terminal
server that converts IP data into a serial "over-the-air port." In other
words, a transmitting radio receives an IP message, strips off the IP
headers, and sends it over the air with VRC identification (VRC-1,
VRC-2, or VRC-3). A receiving radio may then be set up, for example,
to have or an IP port deliver all VRC-1 traffic.
COM2
The transceiver supports operation on three IP payload ports. These set-
tings are made on the IP Payload Configuration Menu (1, 2, or 3) as
shown in Figure 53. In the Master unit only, Multihost may need to be
enabled if more than one IP Payload port is required.
IP Payload is intended to be used in a poll-response system. An Ethernet
device at the master sends UDP/TCP poll messages to the master radio's
Ethernet port which is configured to listen for data. The poll is sent OTA
and a RTU/PLC attached to one of the Remote radios (via serial or
Ethernet) responds. The response is sent OTA back to the Master radio.
The Master radio then sends the response back to the polling station via
Ethernet.
When configuring this feature, you are notified of the success or failure
of the operation. Additionally, Ethernet and OTA statistics can be mon-
itored to inspect the success of the poll-response communication.
The following additional points apply to Ethernet payload operation:
• To make efficient use of limited bandwidth, this feature trans-
ports the payload content of Ethernet data to be sent over the air.
• This feature does not bridge Ethernet networks separated by
radios. For Ethernet Bridging information, refer to "Ethernet
Bridging" on Page 64.
• A broadcast poll-response network is assumed, where addressing
information is contained in the payload portion of the UDP/TCP
messages.
SD Series Ref. Manual (Packet & Transparent Mode) 67