User's Manual

Table Of Contents
ABBREVIATED COMPONENT MAINTENANCE MANUAL
1458-A-1101 / 1458-A-1300
(8) Table 7 lists the equipment covered by this manual.
Table 7. Equipment Description
Equipment PN Description/Notes
SDU 1458-A-1101 The central co
mmunications processing and control unit.
SCM 1458-A-1300 Stores installation configuration, ORT, ICAO, and USIM information.
B. Job
Setup Data (Subtask 23-15-30-99C-001-A01)
(1) The list that follows identifies Honeywell publications that are related to this section:
Not applicable.
C. A35
0 SDU and SCM (Subtask 23-15-30-870-002-A01)
(1) SDU
(a) The SDU is the central communications processing and control unit, largely determining
the functionality of the complete SATCOM system. The signal-in-space parameters are
determined by the SDU in relation to modulation/demodulation, error correction, coding,
interleaving and data rates associated with the communication channel(s). The SDU
contains circuits for conversion of digital and/or analog inputs/outputs to/from RF, and
typically contains a PA module. The SDU interfaces at L-band with the HPA and DLNA
and also controls the antenna.
(b
)
Th
e SDU is capable of sending and receiving various data rates. The rate is dynamically
se
lected by the individual applications and by pragmatic assessment of current operating
c
onditions.
(2) SCM
(a) The SCM is an external peripheral of the SDU and provides a dedicated interface to the
SDU. It stores aircraft specific installation configuration, ORT configuration, and ICAO
identities. The SCM also contains four USIM that store subscriber information for the
SBB network.
(
b)
B
y storing configuration information independent of the SDU, the SCM facilitates
e
fficient SDU replacement. A new SDU that replaces a faulty SDU does not require any
c
onfiguration. All configuration information is obtained from the SCM.
(3) Refer to Figure 7 (GRAPHIC 23-15-30-99B-807-A01) for the A350 SATCOM Avionics System.
EFFECTIVITY
ALL
23-15-30
Page 35 of 70
5 Oct 2012
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