GE Multilin
L60 Line Phase Comparison System
3-39
3 HARDWARE
3.3 DIRECT INPUT AND OUTPUT COMMUNICATIONS
3
3.3.9 C37.94SM INTERFACE
The UR-series C37.94SM communication modules (2A and 2B) are designed to interface with modified IEEE C37.94 com-
pliant digital multiplexers or IEEE C37.94 compliant interface converters that have been converted from 820 nm multi-mode
fiber optics to 1300 nm ELED single-mode fiber optics. The IEEE C37.94 standard defines a point-to-point optical link for
synchronous data between a multiplexer and a teleprotection device. This data is typically 64 kbps, but the standard pro-
vides for speeds up to 64
n
kbps, where
n
= 1, 2,…, 12. The UR-series C37.94SM communication module is 64 kbps only
with
n
fixed at 1. The frame is a valid International Telecommunications Union (ITU-T) recommended G.704 pattern from
the standpoint of framing and data rate. The frame is 256 bits and is repeated at a frame rate of 8000 Hz, with a resultant bit
rate of 2048 kbps.
The specifications for the module are as follows:
•
Emulated IEEE standard: emulates C37.94 for 1
64 kbps optical fiber interface (modules set to
n
= 1 or 64 kbps)
•
Fiber optic cable type: 9/125
m core diameter optical fiber
•
Fiber optic mode: single-mode, ELED compatible with HP HFBR-1315T transmitter and HP HFBR-2316T receiver
•
Fiber optic cable length: up to 11.4 km
•
Fiber optic connector: type ST
•
Wavelength: 1300 ±40 nm
•
Connection: as per all fiber optic connections, a Tx to Rx connection is required
The UR-series C37.94SM communication module can be connected
directly
to any compliant digital multiplexer that sup-
ports C37.94SM as shown below.
It can also can be connected
directly
to any other UR-series relay with a C37.94SM module as shown below.
The UR-series C37.94SM communication module has six switches that are used to set the clock configuration. The func-
tions of these control switches are shown below.
For the internal timing mode, the system clock is generated internally. Therefore, the timing switch selection should be
internal timing for relay 1 and loop timed for relay 2. There must be only one timing source configured.
UR-series
device
C37.94SM
fiber interface
up to 10 km
842757A2.CDR
Digital
multiplexer
C97.94SM
UR-series
device with
C37.94SM
module
C37.94SM
fiber interface
up to 10 km
UR-series
device with
C37.94SM
module
842758A2.CDR
842753A2.CDR
Internal timing mode
Loop timing mode
(factory default)
Содержание L60
Страница 10: ...x L60 Line Phase Comparison System GE Multilin TABLE OF CONTENTS ...
Страница 57: ...GE Multilin L60 Line Phase Comparison System 2 27 2 PRODUCT DESCRIPTION 2 3 SPECIFICATIONS 2 ...
Страница 58: ...2 28 L60 Line Phase Comparison System GE Multilin 2 3 SPECIFICATIONS 2 PRODUCT DESCRIPTION 2 ...
Страница 100: ...3 42 L60 Line Phase Comparison System GE Multilin 3 3 DIRECT INPUT AND OUTPUT COMMUNICATIONS 3 HARDWARE 3 ...
Страница 482: ...6 26 L60 Line Phase Comparison System GE Multilin 6 5 PRODUCT INFORMATION 6 ACTUAL VALUES 6 ...
Страница 554: ...10 8 L60 Line Phase Comparison System GE Multilin 10 2 BATTERIES 10 MAINTENANCE 10 ...
Страница 674: ...B 110 L60 Line Phase Comparison System GE Multilin B 4 MEMORY MAPPING APPENDIX B B ...
Страница 704: ...C 30 L60 Line Phase Comparison System GE Multilin C 7 LOGICAL NODES APPENDIX C C ...
Страница 720: ...E 10 L60 Line Phase Comparison System GE Multilin E 1 PROTOCOL APPENDIX E E ...
Страница 732: ...F 12 L60 Line Phase Comparison System GE Multilin F 2 DNP POINT LISTS APPENDIX F F ...
Страница 742: ...H 8 L60 Line Phase Comparison System GE Multilin H 3 WARRANTY APPENDIX H H ...