Modem Connections - Datum Systems PSM-500 Installation And Operation Manual

Installation
providing a 1 RU space for airflow. Modem units should not be placed immediately above a high
heat or EMF generator to ensure the output signal integrity and proper receive operation.
Do not mount the PSM-500 in an unprotected outdoor location where there is direct contact with
rain, snow, wind or sun. The modem is designed for indoor applications only.
The only tools required for rack mounting the PSM-500 is a set of four rack mounting screws and
an appropriate screwdriver. Rack mount brackets are an integral part of the front panel plate of
the unit and are not removable.
The following interface connections should be available at the mounting location as a minimum:
1. Prime AC power.
2. A 75Ω Transmit IF cable with BNC male connector. (50Ω optional) or a 50Ω Transmit
IF cable with type N male connector for the L-Band version.
3. A 75Ω Receive IF cable with BNC male connector. (50Ω optional)
or a 75Ω Receive IF cable with type F male connector for the L-Band versions.
4. A Terrestrial data interface cable to mate with the modem or installed option; either a
37-pin male "D" sub connector for all standard or appropriate connector for an
optional interface (such as G.703 or Ethernet 10 Base T).
Other optional connections are shown below.

2.3 Modem Connections

All modem connections are made to labeled connectors located on the rear of the unit: The
connector definitions below are those on the modem unit. Any connection interfacing to the
modem must be the appropriate mating connector. Cabling and Connections are detailed in
Appendix C, "Cabling Specifications". Refer to Figure 2-1 to locate the following connectors:
Prime AC power to the far left IEC male input at J1:
90 to 260 VAC, 47 – 63 Hz.
Maximum unit power consumption is 50 Watts (Typical < 30 Watts).
Integral switch provided as part of power entry connector.
Chassis ground connection at #8 stud location J2.
Data Interface Connection at Data Connector J3:
Standard RS–449 Connector (37-pin female "D" sub connector).
DB25 adaptor cable supplied with modem for V.35, EIA 530, RS-232.
Alarm Connection at 9-pin male "D" connector J5.
RS–485 Control Port connection at 9-pin female "D" sub connector J6:
Shield ground on pin 15
Transmit A on pin 6 (output from modem)
Transmit B on pin 1. (output from modem)
Receive A on pin 9 (input to modem)
Receive B on pin 8. (input to modem)
OR
RS–232 Control port connection at 9-pin female "D" sub connector J6:
Transmit on pin 3 (input to modem)
Receive on pin 2 (output from modem)
Common on pin 5.
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PSM-500/500L/500LT SCPC Satellite Modem
PSM-500/500L/500L T- Rev. 0.91