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HONEYWELL Aerospace Electronic Systems Page 23
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kbps.
3 D8PSK TDMS Same as Mode 2 except the voice is now digitized and
the Medium Access changes. Currently. Discussions are
underway to determine if Mode 3 will be deployed. This is
currently only a U.S. program, with earliest use for
datalink scheduled for 2011 (but potentially 4 years
earlier for voice)
4 GMSK STDMA Modulation and Medium Access change and output is
only 19.2 kbps. Mode 4 is being considered as one of the
means to perform ADS-B communication. It is currently
expected that Mode 4 may not impact CMUs, but this is
still to be determined.
The baseline Mark III CMU supports Mode 0 (an analog line to the MSK modem) and Mode A (a W429 link
to the radio which has an embedded MSK modem. Mode 2 utilizes a different modulation scheme (D8PSK)
allowing a throughput increase from 2.4 kbps to 31.5 kbps. Transition to VDLM2 functionality only requires
an operational software upgrade (i.e., no hardware upgrade is required). ). VDL Mode 2 is offered as a
separate (optional) software package.
PCMCIA Data Loading
The Mark III CMU has a PCMCIA connector accessed through the front panel. Utilization of this interface for
fast data-loading capability.
Ethernet
The Mark III CMU is hardware provisioned for up to four 10 Base-T Ethernet ports. These ports can be
utilized in the future for a variety of purposes for high speed data communication.
ARINC 761 SATCOM
As the second generation satellite communications specification (ARINC 761) becomes fully defined, The
Mark III CMU hardware is designed to support such future SATCOM systems, with software only changes.
Mil-STD 1553
The Mark III CMU has an interface to a MIL-STD 1553 bus. Software access to this interface is a potential
upgrade to support interfaces on various military aircraft.
Gatelink
ARINC 751 defines the specification for Gatelink, a wireless LAN interface between the aircraft and the
terminal. The Mark III CMU is hardware provisioned to support a Gatelink interface. Honeywell is currently
working on additional upgrade modifications (to include large mass memory and new additional circuit card
assembly) which would be provided to support a self contained Gatelink capability, with a direct interface to
a TWLU.
UHF
The Mark III CMU has a UHF modem installed as part of the basic Mark III CMU hardware. This has been
included such that if UHF becomes a medium that can provide datalink services, such future capability
could be implemented without modification to the hardware.
Weather Graphics
The ability to uplink graphical weather information is an important feature for certain datalink users,
particularly in the business jet market. From an industry perspective, there isn't a standard mechanism for
delivering graphical weather capability. In addition, weather graphics is currently considered as being cost
prohibitive relative to air transport operation. However, Honeywell plans to monitor the industry work in this
area and potentially offer a graphical weather capability as a software upgrade. The Mark III CMU does