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messages of lype "intermediate" or "final" shall be ignored if a new group has not bccn init~ated by receipt of a "first" segment.
3.2.2.4 TIS ESTABLISHMENT/DISCONNEC'rION PROTOCOLS
The processing required to cstablislddisconnect TIS with Mode S ground interrogators when coverage boundaries are crossed shall
be based upon information contained in the capability registers within the aircraft's Mode S transponder as well as two specific
1'1s uplink messages.
Part I Annex 10 - Aeronautical Telecommunications
3.2.2.4.1 Mode S cupability repofl
Transponder register lol6 within the Mode S transponder shall contain bits that indicate the level of the aircraft with respect to
Mode S functions. This register shall be read by each Mode S ground interrogator that acquires the aircraft. Bit 25 of this register
shall he set to "ONE" if the aircraft carries any MSP data link services ( i t . TIS).
note^- This bit merely indicates the presence of MSP dutu link services on board the aircraft - it does NOT indiaatc whether
any of these services are in use by the aircrew at a given time.
3.2.2.4.2 MSP capability report
Transponder registers lD16 to IF,, within the Mode S transponder contain bits which indicate the dynamic state of certain MSP
data services on board the aircraft (where defined in applications, e.g. TIS). These registers shall be read by each Mode S ground
interrogator that acquires the aircraft if the Mode S capability report indicates that the aircraft carries MSP data link services. Bit
2 of the MSP capability report register IDI6 shall be set to "ONE if TlS support is desired; otherwise, the hit shall be set to
"ZERO. Setting and resetting this bit shall be done in conjunction with the generation of TIS "service connect requests" (TSCR)
and "service disconnect requests" (TSDR) downlink messages as specified in section 4 for downlink broadcast identifier OZl6.
In the absence of TIS traffic data messages, TIS keep-alive messages shall be uplinked by h e Mode S ground interrogator. The
TIS airborne processor shall keep a timer that measures the time interval between TIS uplink messages received. The timer shall
be reset each time a TIS uplink message is received. If this "keep-alive" timer reaches 60 seconds (the "keep-alive" time parameter
for TIS), the TIS ground-to-air service shall be declared to have failed and TIS support is no longer available from [he Mode S
ground interrogator.
Note.- The data link service processing for TIS must receive periodic uplink rnessages from the Mode S ground interrogator in
order tu ensure that the ground-to-air link is maintained and that the ground TIS support is continuing.
3.2.2.4.4 TIS principal interrogator iderztifier (11) code protocol
Each TIS uplink message shall be accompanied by a 4-bit interrogator identifier (II) code that identifies which Mode S ground
interrogator (or interrogators cluster) generated it. At any given moment, only one Mode S ground interrogator shall be declared
as the "principal interrogator" (PI). In areas having overlapping Mode S coverage by interrogators with different I1 codes, an
"alternate interrogator" (AI) shall also be declared. The TIS protocol for handling II codes shall be as defined bclow.
Note.- II codes are assigned to Mode S interrogators in such a way that interrogators with overlapping surveillance coverage
that are not clustered cannot have identical II codes.
3.2.2.4.5 TIS display generation
If TIS messages are received from more than one interrogator at a time, only those TIS messages from the interrogator currently
declared as the PI shall be displayed to the pilot. TIS messages from interrogators other than the PI shall he discarded, except for
the A1 processing described below.
3.2.2.4.6 Alternate interrogator (AI) identification
The I1 code of the most recently receivcd TIS message not from the PI shall be retained as the AI. h the case that no TIS messages
have heen received from interrogators other than the PI (as described below), no currcnt Al shall be defined. The A1 definition shall
be initialized to (he "none slate" when TIS is enabled (TSCR) or disabled (TSDR) by the pilot.
28/11/02
No. 77
Annex 10 - Aeronautical Telecommunications Volume I11
3.2.2.4.7 Principal interrogator (PI) identification
The I1 code of the first Mode S ground interrogator to respond to the TSCR downlink message with a TIS uplink message becomes
the PI. The PI, shall be retained until either:
a) the PI sends a TIS "goodbye" uplink message; or
h) there is a TIS "keep-alive" time-out on the PI.
In either case, the Al (if one is present) shall he promoted to PI and its TIS messages shall now be displayed. A new A1 shall now
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