363-206-295
Maintenance Description
Issue 1
December 1997
9-21
Path Protection Switching (Path Switched Rings)
9
The path switched ring application is based on the Bellcore TR-TSY-000496/
GR-1400 path protection switching scheme.
The path protection switched ring has two single-fiber, counter-rotating rings as
shown in Figure 9-6. This architecture has distinct advantages over a linear
architecture. Each node on the ring terminates four fibers: a transmit and receive
fiber in each direction. Eight fibers are needed to connect the same NE in a
nonterminal position of a linear add/drop 1+1 protected arrangement: two transmit
and two receive in each direction, without providing the same level of protection
that the ring provides. The architecture of the ring is designed to protect against
any single point of failure, including a node failure, single fiber cut, or dual fiber
cut. Node failure or dual fiber failure in a linear network affects traffic to all
downstream nodes. A node failure in a ring only affects traffic dropped at the failed
node.
The DDM-2000 OC-12 ring provides STS-1 path protection switching to support
DS3, EC-1, and OC-3/IS-3 interfaces.
The signal that enters the ring is protected on a SONET path basis as switching is
performed independently for each path. Because of the ring's unidirectional
operation, time slots must be reserved all the way around the ring for all ring
traffic, limiting the capacity of the ring to the OC-N line rate.
Figure 9-6.
Two-Fiber Unidirectional Ring
Primary
Ring
Secondary
DDM-2000
Ring
DDM-2000
DDM-2000
DDM-2000
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 ...
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Страница 1243: ...Clearing Trouble 363 206 295 TAP 107 1 of 1 Page 1997 December 1 Issue Unused ...
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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 ...