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Quantum and Evolution Series Installation and Operating Handbook
Remote M&C Connector
This is a 9-pin female 'D' type connector. The modem supports the Paradise Universal
Protocol (PUP) as specified in the document 'Remote M&C Specification for Quantum and
Evolution Series Satellite Modems'. The electrical interface can be selected between
RS232 (for direct-to-PC applications) and RS485 (for multidrop applications). The Remote
M&C port may be linked under software control to the Async ESC port for distant end
remote M&C control over satellite.
Ethernet IP and M&C Connectors
There are two RJ45 auto-sensing 10/100Mbps Ethernet connections. These support both
half-duplex and full-duplex operation. One of these can be switched to the main modem
traffic channel for sending and receiving TCP/IP data over satellite, while the other is for
remote M&C. M&C control can be via the Simple Network Management Protocol (SNMP),
an embedded web server that sends web pages to a web browser, a Telnet-style terminal
emulation application or via TCP packets that encapsulate Paradise Universal Protocol
(PUP) commands. Although the two connectors are labelled for IP traffic and remote M&C
respectively, they are in fact interchangeable since the modem acts as an Ethernet bridge
(satellite IP traffic and modem M&C messages can use the same single connector if
preferred). It is also possible to change the configuration so that the M&C port is removed
from the bridge, which may benefit security in some circumstances where it is important to
separate the M&C and IP traffic streams.
An M&C IP address, subnet mask and default gateway may be set in the modem. When
using TCP acceleration and the M&C interface does not form part of the Ethernet bridge,
then a traffic IP address must be set in addition. Note that the modem is not configured for
auto-sense of the cable type and consequently either a straight or crossover (patch) cable
may be required, depending on the equipment being connected (typically a straight cable is
required when connecting direct to a PC and a crossover cable is required when
connecting to a hub or switch). Setting up IP addresses is covered in more detail in Section
8.12.
Station Clock
This connector is a 75Ω BNC female that accepts a 1-10MHz signal, either a square
wave of >1V p/p (e.g. a G.703 para. 10 `synchronising clock`) or a sinusoid at a power
level of 0dBm or greater. An alternative Station Clock signal at RS422 interface levels can
be applied to the Async ESC connector. Either signal can be used by the modem as a
reference for the receive output clock (the Station Clock does not have to be the same
rate as the data as an internal PLL converts between rates). In addition, if the Rx
Clocking is set to use the Station Clock and the Tx Clocking is set to Rx, then the Station
Clock also sources the internally generated Tx Clock (Tx and Rx data rates are
independent). If a 10MHz signal is applied, this signal may also be used in place of the
internal reference for the Tx and Rx IF synthesisers.
6-17
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