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PSM-500/500L/500LT SCPC Satellite Modem
Installation
When the unit is powered-up again the main modem processor will automatically query the new
interface card and determine the type and options installed.
Most option interface cards completely co-exist with the on-board interface types, allowing the
optional interface to
represent one or more
Rear Connector Plate
added interface types
available. Only one
interface type is however
External Connector Area
allowed to be enabled at
one time.
The SnIP Ethernet
interface and the HSSI
interface may be installed
alone or together. In the
latter case the two
interfaces are "stacked"
and a special ribbon cable
is available for this
To
configuration to connect to
P5
the internal modem
interface. More information
on this installation is
provided with the HSSI
interface option.
Once installed the main
data interface for the SnIP
option is its standard RJ-45
10/100 base T Ethernet
interface connector located
on the rear panel.
Once installed the main
data interface for the HSSI
option is its standard High Density SCSI-2 type connector located on the rear panel. This
connection is designed to interface directly with a Cisco or compatible HSSI router interface
module via a commercially available HSSI cable. See Appendix C for more cable information.
2.10.2 Optional Interface Configuration
Installed interface cards are automatically recognized by the modem and an entry is added to the
Interface Option selection menu. Selection of the option interface then becomes identical to
selection of any of the standard interfaces. Both the SnIP and HSSI automatically use the
modem's transmit and receive data rate parameter as their clock signal just like the standard
interfaces.
2.11 Option FEC Card Installation
The PSM-500 Modem contains on-board circuitry and two "slot" connectors for adding several
available and planned FEC option "daughter" boards. These plug into either the A or B slots on
the main modem assembly. Installation of these cards is not difficult, but requires removal of the
modem from service and removal of the unit's cover, and should be accomplished only by a
qualified technician. The modem automatically recognizes the presence of the option card and
PSM-500/500L/500LT - Rev. 0.91
Page 2-25
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