Home' RTCA Documents for Review : DO-262D Contents 45
© RTCA, 2018
Circuit-mode data service, which provides a circuit-switched data channel to support a
variety of communication applications that require the allocation of dedicated channel
capacity for the duration of a call (such as interactive or bulk data, encrypted
voice/data and facsimile), may optionally be provided in AESs capable of voice
The minimum requirements for circuit-mode voice service on the satellite subnetwork,
if such service is provided by an AES, shall be the minima specified for that
subnetwork in the appropriate normative appendix.
Circuit-mode voice and data service shall comply with the priority, precedence and
preemption requirements established in Section 2.2 .4.2 of this document.
NOTE 2: Samples of cockpit voice interworking can be found in ARINC-741 Part 2.
These interworking connections are installation specific, and are not
addressed in this minimum standard.
Recovery from Primary Power Interruption
The NGSS equipment shall conform to the following requirements after encountering
primary power interruptions from any cause.
1) Power interruptions of less than 5 milliseconds duration shall be indistinguishable
from outages in the RF transmission path of equal duration.
2) Power interruptions from five to 200 milliseconds duration shall require no more
than five seconds recovery time, beginning from when primary power has been
restored. Recovery is defined as automatically returning to the previous operating
state (without user intervention) such that data channels resume in the same
configuration they were in before the power interruption occurred. This assumes a
channel signal with at least the minimum quality characteristics specified in
In-transit data service packets which have been acknowledged on either
the DTE or DCE interface, but not yet transferred to the opposite
interface, may be lost. Higher-layer entities that employ end-to-end
acknowledgment protocols may choose to retransmit such lost data.
Synchronization and RF output power may be lost during the power
interruption and recovery time. There shall be no more than a
momentary effect on cockpit displays.
The NGSS equipment shall provide, independent of any operator action, an indication
of a failure of NGSS equipment resulting in loss of data or voice communications, as
EQUIPMENT PERFORMANCE – ENVIRONMENTAL CONDITIONS
The environmental tests and their associated performance requirements described in
this Section are intended to provide a laboratory means of determining the overall
performance characteristics of the equipment under environmental conditions
representative of those which may be encountered in actual operations.
Unless otherwise specified, the test procedures applicable to a determination of
equipment performance under environmental test conditions are contained in RTCA
Document DO-160, Environmental Conditions and Test Procedures for Airborne
Equipment. General information regarding the use of the procedures in RTCA
DO-160/EUROCAE ED-14 is contained in Sections 1.0 through 3.0 of that document.
Also, a method of identifying which environmental tests were conducted and other
amplifying information on the conduct of the tests is contained in Appendix a of RTCA
DO-160/EUROCAE ED-14 .
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