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Operations Manual, HPA3, Mini Compact Outdoor SSPA
208143 REV C
75
that it requires low overhead resulting in minimal impact to network performance. The control
application sends a UDP request to SSPA unit and waits for response. The length of time the
control 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
retransmits the request. The number of the retransmissions is user configurable.
The Teledyne Paradise Datacom 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 SSPA
serial protocol was selected. This protocol proves to be 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 Paradise Datacom protocol frame is shown on
Figure 9-6
.
A detailed OSI model for the RM SSPA M&C interface is represented in
Table 9-10
.
This set of Ethernet IP protocols is currently supported by Teledyne Paradise Datacom
Universal M&C package (Compact Outdoor SSPA). The software is supplied on CD with the
unit, or can be downloaded from the company web site, http://www.paradisedata.com.
UDP Header
(8 bytes)
SSPA Serial Protocol Frame
(11+N Bytes, 0<N<128)
Figure 9-6: UDP Redirect Frame Example
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OSI Layer Protocol
Notes
Application
Paradise Datacom CO
SSPA Serial Protocol
Frame structure is described in
Section 9.1
Transport
UDP
Connectionless transport service. MTU on target PC
must be set to accommodate largest SSPA Serial Pro-
tocol 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 9-10: OSI Model for Compact Outdoor SSPA Ethernet IP Interface