To Next Page

To Previous Page

A B

Ch1

Ch2

Fixed conﬁguration

3-6 ends, ring connected.always

(optimum performance)

Note the channel allocation (Ch1/Ch2)

E02524

Figure 154: Fibre teleprotection connections for a six-terminal scheme

2.2 PROTECTION COMMUNICATIONS CHANNEL

Multi-ended line differential communications will be using a ring structure.

C37.94 will be the only communication pr

otocol for the protection communications for multi-ended line

differential.

2Mbps E1 will be an additional communication protocol option that will be realised via GE recommended third

party conversion box which will have C37.94 over fibre optic as an input and E1 at 2Mbps over copper as an

output.

For a 6 ended scheme, each terminal will need to communicate with 5 others. This will be done by utilising the

spare slots in C37.94 to pass the data.

Multi-ended line differential communications will have a number of slots in the C37.94 data frame allocated to

each terminals depending on the number of terminals in the scheme.

All the C37.94 slots will be used for all configurations to deliver maximum performance.

2.3 1.1.1.PROTECTION COMMS MESSAGE SLOT ALLOCATION FOR EACH PROTECTION

SCHEME

In most schemes data from each terminal will be available in each communication channel. The multi-end

differ

ential algorithm will use the first valid data received with the correct sequence number from either channel.

Terminal 1

Terminal 2

Terminal 1

Data

Terminal 2

Data

E02525-1

Figure 155: Two terminal single channel scheme

P54A/B/C/E Chapter 15 - Fibre Teleprotection

P54xMED-TM-EN-1 315

GE P54C User Manual

Questions and Answers: