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I) if a "call progress - channel release" CM-LIDU is
received within tA25 seconds after receipt of the
"call announcemcnt" CM-LDU, AES circuit-mode
serviccs shall terminate all activities for the call; or
2) if neither a "C channel assignment7' CM-LTDU or a
"call progress - channel rclease" CM-LIDU are
received within tA25 seconds after receipt of the
"call announcement" CM-EIDU, AES circuit-mode
211UOO
No. 75
Part I Annex 10 - Aerolrautical Telecommunications
services sllall forward to the link layer a negative
"telephony acknowledge" CM-LIDU (encoded to
indicate that the "C channel assignment" CM-LIDU
is missing) via the R channel and await their arrival
for an additional tA27 seconds. If neither of the CMLIDUs
arrive after tA27 seconds, AES circuit-mode
services shall again forward to the link layer the
negative "telepliony acknowledge" CM-LIDU and
await an additional tA27 seconds; provided that the
rocal number of repetitions of the negative "telephony
acknowledge" CM-LIDU does not exceed four. If
ndther of the CM-LIDUs are received within tA27
seconds after the fourth repetition of the negative
"telephony acknowledge" CM-LIDU, AES circuitmode
services shall forward to the link layer a "call
progress - call attempt resull" CM-LIDU via the R
channel and terminate all activities for the call; or
mode services sl~all forward to the link laycr another
"call progress - test" CM-LDU until any of the
following occur:
I) il neither a "call progress - test" CM-LIDU or a
"call progress - channel release" CM-LIDU are
rcceived wilhin tA41 seconds after activation of the
C channel unit, AES circuit-modc scrvices shall stop
forwarding "call progress - test" CM-LLDUs, shall
then forward to thc link layer a "call progress - call
attempt result" CM-LIDU via the R channel and
terminate all aclivities for the call; or
2) if a "call progress - channel release" CM-L1DU is
received withi~lt A41 seconds after activation of the
C channel unit, AES circuit-mode services shall
terminate all activities for the call; or
3) if the call attempt is eo be pre-empted for a higher 3) if the C channel is to be pre-empted for a higher
priority call, AES circuit-mode services shall forward ptiority call, AES circuit-mode services shall forward
to the link layer a "call progress - call attempt to the link layer a "call progress - call attempt
result" CM-LIDU via the R channel and terminue all result" CM-LIDU via the R channel and terminate all
activities for the call; or activities for the call; or
4) if a "C channel assignment" CM-LDU is received
within either tA25 secoilds after receipt of the "call
amouncement" CM-LIDU or tA27 seconds after
receipt 01 [he transmission of the latest negative
"teIepho11y acknowlcdge" CM-LIDU, AES circuitmode
sctvices shall do the following:
i) if the called terminal is occupied with a call at a
priority higher than or equal to the current call
attempt, or if C channel resources are not
available, AES circuit-mode services shall
forward to the link layer a "call progress - call
attempt result" CM-LIDU via the R channel and
terminate all activities for the call; or
ii) if the called terminal and C channel resources are
both available, AES circuit-mode services shall
request AES mmagcment to allocate the
resources at a C channel Q number value as per
Table 4-43 and activate a C channel unit on thc
assigned frequency. AES circuit-mode services
shall then forward to the link layer a "call
progress - test" CM-LIDU and perform the AES
incoming C channel continuity check procedure in
4.8.6.1.1.2.2.
4.8.6.1.1.2.2 AES incoming C channel continuity check.
Where required elsewhere in 4.8, AES circuit-mode services
shall perform a C channel continuity check by doing the
following:
a) if neither a "call progress - test" CM-kIDU or a "call
progress - channel release" CM-LDU are received
within tA26 seconds after the most recent "call progress
- test" CM-LIDU has been forwarded, AES circuit-
4) if a "call progress - test" CM-LDU is received
within tA41 seconds after C channel unit activation,
AES circuiCinode services shall enable the circuit
palh between the C channel unit and the forward
circuit of lhe aircraft network. AES circuit-mode
services shall then folward to the link layer a positive
　
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