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Vision Series Installation and Operating Handbook
Async ESC Connector
This is a 15-pin `D` female connector. The I, Q and symbol clock outputs are used to
monitor the receive constellation (allow ing received signal quality to be monitored on an
oscilloscope). This connector also provides the input port for an RS422-compatible Station
Clock. The connector name is historical and no ESC channel is actually available as part of
the satellite servi c e.
On-line LED
This LED mirrors the front panel Tx Carrier LED, so that from the rear of the equipment the
operator can tell if the carrier is off and which unit of a 1:1 pair is the offline unit.
Terrestrial Interface Connectors
Although there are tw o terrestrial interface connector positions, only one interface card can
be fitted at any one time. Supported interface cards are Quad ASI and IP Traffic.
Rx IF Input Option
This is a BNC female connector and can be used in either 50
or 75 -impedance mode.
The carrier signal level presented at the input of the modem should be in the range -60dBm
to -30dBm. A level of -45dBm is recommended. The maximum composite pow er level that
should be applied to this port is 30dB above the desired carrier, up to a maximum of 0dBm.
Rx L-Band Input Option
This is a N type female connector of 50
impedance. The carrier signal level presented
at the input of the modem should be in the range -20dBm to -70dBm. A level of -45dBm is
recommended. The maximum composite pow er level that should be applied to this port
is +35dBc up to maximum of -10dBm
Fan
There is a fan that runs at all times w hile the unit is pow ered. This draws ai r in from the
sides and expel s to the rear. The side vents must not be blocked.
1:1 Redundancy Connector
The modem has a built-in 1-for-1 redundancy-controller that connects to the corresponding
port of another modem via a 9-pin male 'D' type connector. A 1:1 redundancy system
requires two modems, a 1:1 control cable between the two redundancy connectors, a data
split (`Y`) cable and passive splitters/combiners for the IF ports. An overview of 1-for-1
operation is provided in Section 8.2.
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 Vision Series
Satellite Modems'. The electrical interface can be selected between RS232 (for direct-to-
PC applications) and RS485 (for multidrop applications).
Ethernet IP and M&C Connectors
There are two RJ45 auto-sensing 10/100Mbps Ethernet connections. The base modem IP
Traffic Ethernet port is unused on the Vision modem ( IP traffi c over satellite requires the
P3714 IP Traffic option card). The remote M&C Ethernet port supports both half-duplex and
full-duplex operation. M&C control can be via the Simple Netw ork Management Protocol
(SNMP), an embedded w eb server that sends web pages to a w eb browser, a Telnet-style
6-10
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