Chapter 2 • Subsystems
20
1037852-0001 Revision A
CDS replaces the IFSS-TC, which shipped with older systems.
Furthermore, while the introduction of CDS is an upgrade, HX
systems continue to support both CDS and IFSS-TC.
CDDM The CDDM is a 6U wide module that plugs into one of the I/O
slots in the front of a cPCI chassis.
CDIM The CDIM is a 6U wide module that plugs into one of the I/O
slots in the rear of a cPCI chassis. The CDIM card accepts a
wideband IF input signal containing one or more inroutes,
centered at 70 MHz with a bandwidth of 36 MHz from the
external NOC equipment.
IF Subsystem-Turbo Code
system
In place of the CDS, most older systems have the IFSS-TC.
The IF Subsystem-Turbo Code (IFSS-TC) is a modular system
that:
• Acts as the HX gateway satellite radio receiver.
• Demodulates and decodes inroute signals received from
remote user modems via the satellite.
A typical redundant configuration includes:
• Up to two compact peripheral component interconnect (cPCI)
chassis, that contain storage media, power supplies, control
processors (CPs), CP transition boards, and RCDs that
contain software radio modules (SRMs) and receive control
modules (RCMs)
• One optional frequency distribution unit (FDU)
• Up to two intermediate frequency distribution units (IFDUs)
• One optional HNS timing control (HNSTC) distribution unit
(HDU)‘
A nonredundant system contains one cPCI chassis.
Return channel components The NOC can be configured with one or more TDMA return
channel subsystems (TRCSs). The TRCS manages the return
channels associated with a group of satellite modems.
Return channel demodulator
The RCDs provide the demodulation of the TDMA burst return
channels. The RCD accepts the inroute data, extracts the traffic
data, and gives the traffic data to the DNCC. The RCD consists of
the SRM and RCM.
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