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Operations Manual, 7RU SSPA Chassis 208528 REV M 115
application waits depends on how it is configured. If the timeout is reached and the control
application has not heard back from the agent, it assumes the packet was lost and retrans-
mits the request. The number of the retransmissions is user configurable.
The Teledyne Paradise Datacom RM SSPA Ethernet IP interface can use UDP ports from 0
to 65553 for sending and receiving. The receiving port needs to be specified through the front
panel menu. For sending, it will use the port from which the UDP request originated. Of
course, it is up to the user to select an appropriate pair of ports that are not conflicting with
standard IP services. Paradise Datacom recommends usage of ports 1038 and 1039. These
ports are not assigned to any known application.
As an application layer protocol (which actually carries meaningful data), the standard Tele-
dyne Paradise Datacom RM SSPA serial protocol was selected. This protocol is extremely
flexible and efficient. It is also media independent and can be easily wrapped into another
protocol data frame. An example of the UDP frame with encapsulated Teledyne Paradise
Datacom protocol frame is shown in
Figure 7-9 .
A detailed OSI model for the RM SSPA M&C interface is represented in Table 7-10 .
This set of Ethernet IP protocols is currently supported by the Teledyne Paradise Datacom
Universal M&C software package. The software is supplied on CD with the unit, or can be
download from company's web site, http://www.paradisedata.com.
UDP Header
(8 bytes)
SSPA Serial Protocol Frame
(11+N Bytes, 0<N<128)
Figure 7-9: UDP Redirect Frame Example
CRC 16
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OSI Layer Protocol Notes
Application
Paradise Datacom RM
SSPA Serial Protocol
Frame structure described in Section 7.2
Transport UDP
Connectionless transport service. MTU on target PC
must be set to accommodate largest SSPA Serial
Protocol Frame. Set MTU to a value larger than 127
bytes.
Network IP
ARP, RARP and ICMP Ping protocols supported by
RM SSPA controllers. Static IP Address only, no
DHCP support.
Data Link Ethernet 10/100 Base-T Network
Physical
Standard CAT5 (CAT 6)
Network Cable
Maximum node length 100 m
Table 7-10: OSI Model for RM SSPA Ethernet IP Interface