2-4
SES Signalling Channel Packet Types
Packet Destination
1 Acknowledgement LES
2 Announcement Response LES
3 Assignment Response LES
4 Clear LES
5 Data Report NCS & LES
6 Distress Alert NCS & LES
7 Distress Alert Test LES
8 MES Forced Clear NCS & LES
9 Login Request NCS
10 Logout Request NCS
11 Message Status Request NCS & LES
12 Test Request NCS
13 Test Result Acknowledgement LES
14 Transfer Status Request NCS & LES
15 Assignment Request NCS & LES
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
MES ID
FILL
Logical Channel No.
Packets
3. Assignment Response
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
MES ID
LES ID
Service Depend Descriptor
Destination
Descriptor
15. Assignment Request
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
Logical Channel No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
Errored Packet No.
1. Acknowledgement
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
MES ID
LES ID
Position
P
Nature
Course
Speed
DA PA CU
6. Distress Alert
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
MES ID
Class
Version Number
FILL
9. Login Request
8 7 6 5 4 3 2 1
Type
P
Check sum
1
15
C
MES ID
FILL
10. Logout Request
Figure 2-4 Signalling Channel Packet Formats
Note)
P: Priority (Distress,
Normal)
C: Continuation (Last
packet in sequence,
Another packet to follow)
Type:Packet type
Logical Channel No.:
Communication
Channel
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