Furuno FELCOM 15 Service Manual

AP1.3 Channel types and Signal processing
AP1-17
AP1.3 Channel types and Signal processing
AP1.3.1 Channel types
A MES uses the following channels for the communications.
1) NCS Common Channel (NCS CC)
2) LES TDM Channel
3) MES Signaling Channel
4) MES Message Channel
Details of each channel are tabulated below.
Table AP1.3.1
NCS Common
Channel
LES TDM
Channel
MES Signalling
Channel
MES Message
Channel
Use
MES signalling
(Line control),
EGC, etc.
MES signalling
(Line control),
LES to MES
message
NCS, LES
signalling
(Line control)
MES to LES
message
Contents Refer to section AP1.1.5
TX method
Continuous
TDM
TDM
(Time Division
Multiplex),
Continuous or
on demand
TDMA
(Time Division
Multiplex
Access)
SCPC (Single
Channel Per
Carrier)
Speed
8.64sec/frame
1200
symbols/sec
8.64sec/frame
1200
symbols/sec
1200
symbols/sec,
28 slots
(2nd Gen.SV)
1200
symbols/sec
(2nd Gen.SV)
Packet 640 bytes 640 bytes 15 bytes 128 bytes
Bulletin Board Every frame Every frame - -
Scrambling Yes Yes Yes Yes
Encoding Yes Yes Yes Yes
Unique word 128 symbols 128 symbols 64 symbols 128 symbols
Permuting Yes Yes - Yes
Preamble - - - Yes (192bits)
Signal
process
(TX)
Interleaving Yes Yes - Yes
Number of Symbols 10368 symbols 10368 symbols 316 symbols 10368 symbols
TDM: Time Division Multiplex. A process for transmitting two or more channel signals
simultaneously to MES over a common channel path by using successive time
intervals (time slots) for different channels.
TDMA: Time Division Multiplex Access. A system which allows a plural number of
MES to access an LES (NCS) over a single transmission line by assigning
each MES a time slot on the TDM channel in which to transmit over.
SCPC: Single Channel Per Carrier. Enables assignment of channel for a call.

Furuno FELCOM 15 Specifications

General

Brand	Furuno
Model	FELCOM 15
Category	Marine Radar
Language	English