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radio.
5. To show the submenu for a particular radio (to set presets, select modes, etc.), push the line select key for the radio
when the scratchpad is empty.
6. To return to the TUNE page from a submenu, push the line select key for the radio or push the TUN key.
COMMUNICATIONS
Sep 13/2004 Flight Crew Operating Manual Volume 2
REV 1 CSP 100-6 06-01-11
HF RADIO COMMUNICATION (Cont)
PRESET PAGE
In the tune mode, PRESET allows the pilot to select and configure 16 predetermined combinations of transmit and receive
frequencies and transmission modes on the CDU PRESET pages or on the MFD radio control pages. Five CDU preset pages
are available for each HF1 (HF1 and HF2), depending on the type of preset data and selected HF mode of operation.
Selection of the preset mode changes the HF preset frequency to the last selected numbered preset selection.
SIMPLEX/DUPLEX OPERATION
The simplex/duplex mode selection is applicable to all modes of transmission. Simplex mode allows transmission and reception
to occur on only one frequency and in only one direction at a time. Both parties cannot receive at the same time as
they are transmitting. The duplex mode is actually half-duplex mode allowing transmission and reception on separate frequencies,
but still only one direction at a time.
SELCAL SYSTEM (OPTIONAL)
DESCRIPTION
The optional SELCAL system allows the crew to maintain continuous VHF or HF radio watch with a ground facility without
the burden of listening to the assigned radio.
COMPONENTS AND OPERATION
The selective calling (SELCAL) system monitors the pre-assigned SELCAL VHF or HF frequency. Each SELCAL
equipped aircraft is assigned its own four-letter SELCAL code. When the ground station wants to talk to the aircew, they
transmit the aircraft’s assigned SELCAL code.
When the VHF or HF radio receives the code, the SELCAL decoder sends a signal to the EICAS data concentrator unit to
display the cyan advisory message. The advisory message identifies which of the VHF or HF systems received the message.
An aural “SELCAL” alert is sounded to advise the crew of the incoming call.
The SELCAL message on EICAS is removed when the radio/transmit switch is activated for the VHF or HF radio that
received the message.
SATCOM (OPTIONAL)
DESCRIPTION
The satellite communication (SATCOM) system (optional), makes possible voice and data communications in most locations
in the world (except in the farthest polar regions). SATCOM is also better than other long-range communication systems
in connectivity, voice quality, reliability, and traffic volume capacity.
The SATCOM option consists of three primary systems:
- Space system
- Ground system (ground earth stations (GESs), service providers, public telephone systems, etc.)
- Aircraft earth station (AES)
The space system is a series of satellites that act as a two-way relay between the AES and GES. The satellites are in geosynchronous
orbits 22 300 mi (36 000 km) above the equator. The satellites operate between 75 degrees north and south
latitude and there is an overlap in the areas of coverage.
The ground system has GESs and local/long distance telephone networks. The GESs interchange data between the space
system and the public or private telephone and data networks for worldwide communications.
The AES operates within the satellite communications system of the international maritime satellite organization. The AES
uses the satellite to give digital communication between the aircraft and the GES. The AES access the international maritime
satellite organization satellites with L-band communications. The satellites then transmit and receive the data with Cband
to the GES. The GES can transmit packet data (such as ARINC communications addressing and reporting system
(AFIS), that provides data on aircraft conditions, departure time, arrival time, or flight delay time). The GES can also transmit
telephone communications (such as voice, fax, and PC modem data).
COMMUNICATIONS
Volume 2 Flight Crew Operating Manual Sep 13/2004
06-01-12 CSP 100-6 REV 1
SATCOM (OPTIONAL) (Cont)
The SATCOM system interfaces with a dedicated antenna subsystem to provide satellite communications. A minimum of
three satellite communications channels are required: two voice channels and one data channel. One voice channel is dedicated
to the flight compartment, and another voice channel is dedicated to the office in the sky (OITS) telephone. The data
channel is assigned for either the airborne flight information system (AFIS) or the OTIS facsimile or modem.
The factory option of the SATCOM consists of a six channel SATCOM system and antenna. Components include:
- Satellite data unit
- High power amplifier
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