363-206-295
Applications
2-36
Issue 1
December 1997
Teleprotection and Supervisory Control and Data
Acquisition (SCADA) Applications
2
Electric utilities are facing an unprecedented demand for increased
communications bandwidth to support modern operations and business
applications such as substation automation, computer networking, and video
teleconferencing. Many electric utilities are installing SONET fiber optic
backbones to meet these needs. SONET fiber optic backbones are a valuable
communications resource that can also be used for real time protective relay and
SCADA applications.
DDM-2000 OC-3, DDM-2000 OC-12, and DDM-2000 FiberReach Multiplexers
can be used in a flexible backbone network among electrical substations and
other important sites. These systems provide an innovative "locked cross-
connection" feature that enhances the ability of SONET rings to transport
protective relay and SCADA communications. The locked cross-connection
feature meets the teleprotection requirements for minimum and stable
transmission delay, minimum system outage during a protection switch, and DS0
level bandwidth management at all ring nodes.
The locked cross-connection feature allows a DS1 to be removed from the
TR-496 compliant VT path protection switching algorithm and provisioned as an
unprotected path between any two nodes on the ring. As shown in Figure 2-23,
locked cross-connection can be used to interconnect adjacent nodes all the way
around SONET rings, thereby permitting access to the DS1 at each SONET
node. Figure 2-23 shows a single DS1 locked between ring nodes, but this can
be extended to an arbitrary number of DS1s within the available SONET
bandwidth. This locked cross-connection feature fixes the ring rotation (and
delay) of the DS1 paths on the ring and also permits DS0 grooming of the DS1s
at each DDM-2000 or DDM-2000 FiberReach node using an external drop/insert
multiplexer, such as the RFL 9001 Intelligent Multiplexer. Figure 2-23 shows the
DDM-2000 interconnecting at the DS1 level with an adjacent RFL 9001 Intelligent
Multiplexer that, in turn, connects on the low-speed side to protective relay and
SCADA equipment. Specially designed channel units in the RFL 9001 Intelligent
Multiplexer detect when a fault occurs on the power line or substation and
communicate at the DS0 level with other substation nodes to isolate the power
grid fault.
In addition to the efficient DS0 grooming capability, the RFL 9001 Intelligent
Multiplexer implements its own protection algorithm that can restore the DS0
level circuits within the locked cross-connections should the ring be cut. This
algorithm operates much faster than the SONET TR-496 algorithm, thereby
minimizing system outage during a protection switch.
Содержание DDM-2000 OC-12
Страница 1: ...363 206 295 Issue 1 December 1997 DDM 2000 OC 12 Multiplexer Release 7 0 User Service Manual Volume I ...
Страница 37: ...Tables xxxviii Issue 1 December 1997 A A SONET Overview A 1 SONET Payloads A 18 A 2 SONET Transport Rates A 19 ...
Страница 506: ...INS PROG 8 of 8 Page INS PROG COMMANDS RELATED rtrv eqpt rtrv ne OC 12 DDM 2000 1997 December 1 Issue 11 89 ...
Страница 528: ...RTRV ATTR ALM 2 of 2 Page RTRV ATTR ALM COMMANDS RELATED set attr alm OC 12 DDM 2000 1997 December 1 Issue 11 111 ...
Страница 565: ...RTRV OC3 3 of 3 Page RTRV OC3 COMMANDS RELATED rtrv sync 11 148 1997 December 1 Issue OC 12 DDM 2000 ...
Страница 664: ...SET FEAT 3 of 3 Page SET FEAT COMMANDS RELATED rtrv feat OC 12 DDM 2000 1997 December 1 Issue 11 247 ...
Страница 766: ... Ctl T TOGGLE 2 of 2 Page Ctl T TOGGLE COMMANDS RELATED logout rlgn OC 12 DDM 2000 1997 December 1 Issue 11 349 ...
Страница 847: ...Multiplexer OC 12 DDM 2000 7 Release TARP TOP Manual User Service II Volume 363 206 295 1 Issue 1997 December ...
Страница 867: ...363 206 295 TOP Maintenance and Operation BLANK LEFT INTENTIONALLY PAGE THIS 12 1997 December 1 Issue ...
Страница 1145: ...Order Circuit 363 206 295 NTP 029 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1146: ...Order Circuit 363 206 295 NTP 030 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1182: ...Turnup System 363 206 295 NTP 033 1 of 1 Page 1997 December 1 Issue Unused LISTED ORDER IN BELOW ITEMS DO TO GO DETAILS FOR ...
Страница 1243: ...Clearing Trouble 363 206 295 TAP 107 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1393: ...363 206 295 DLP 513 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1394: ...363 206 295 DLP 514 1 of 1 Page 1997 December 1 Issue Unused ...
Страница 1456: ...363 206 295 DLP 523 7 of 7 Page 1997 December 1 Issue OC 12 via Access Broadcast Video for Cross connections of Example 4 Figure ...
Страница 1465: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 2 Page Schematic Ring Virtual ATM Sample 1 Figure ...
Страница 1469: ...DLP 525 363 206 295 1997 December 1 Issue 6 of 6 Page Ring Virtual ATM OC 12 DDM 2000 for Cross connections of Example 4 Figure ...
Страница 1565: ...363 206 295 DLP 543 6 of 5 Page 1997 December 1 Issue Network Broadcast Video of Test Transmission 2 Figure ...
Страница 1566: ...DLP 543 363 206 295 1997 December 1 Issue 6 of 6 Page Network Ring Virtual ATM of Test Transmission 3 Figure ...