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HONEYWELL Aerospace Electronic Systems Page 9
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Portable Data Loader 615 High speed ARINC 429 1 Baseline
Ethernet Data Loader 615A Ethernet 10BaseT note 2 Growth
PCMCIA --- PCMCIA 1 Baseline
Notes:
1. Supports up to 2 total SDUs, whether ARINC 741 or 761.
2. The Mark III provides 4 10BaseT Ethernet ports which can be used for any purpose.
3. Supports 1 ARINC 740/744 printer in baseline. An additional printer can be added to one of the spare
ARINC 429 ports. This requires a software upgrade.
4. Supports 3 FMCs in the AT & Mil products.
5. Supports 2 DCDUs in the AT & Mil products and 1 DCDU in the BRH product
6. The Baseline Mark III supports Cold Spare operation. A software upgrade would be required for
additional dual capability.
7. The Mark II CMU interfaces with the transponder to obtain the ICAO address
2.2.1 Subnetwork Interfaces
The Mark III CMU supports a complete set of ARINC 758 subnetwork interfaces (see Figure 2).
Figure 2 CMU Subnetworks
ARINC 716 VHF Radio
The Mark III CMU supports an interface with one ARINC 716 VHF radio. The interface supports VDL Mode 0,
via an audio line to the Minimum Shift Keying (MSK) modem resident in the Mark III. There is also a low
speed ARINC 429 transmit interface between the CMU and the ARINC 716 radio that is used to send
frequency tuning information.
ARINC 750 VHF Data Radio (VDR)
The Mark III CMU can interface with up to three ARINC 750 VDRs. The Mark III supports the operation of a
VDR operating in ARINC 716 mode by utilizing the same audio line as used for an ARINC 716 radio. The
CMU also supports a high speed ARINC 429 interface to the VDRs for VDL Mode A.
VDL Mode 2 will utilize the same high speed ARINC 429 interface as VDL Mode A, allowing growth to VDL
Mode 2 with just a software upgrade. VDL Mode 2 offers an increase of throughput from 2.4 kbps to 31.5
kbps. VDL Mode 2 is necessary both for ATN communications and for ACARS Over AVLC (AOA). VDL
mode 2 is offered as an optional software package for the Mark III CMU.
Mark III
CMU
ARINC 716
Radio
Gatelink
ARINC 750
VDR
ARINC 750
VDR
ARINC 750
VDR
SDU
SDU
Mode S
Mode S
HFDR
HFDR
UHF