363-206-295
Applications
Issue 1
December 1997
2-13
Folded Ring
2
DDM-2000 OC-3 and OC-12 rings offer several benefits in addition to service
assurance. Economically, a ring network minimizes overall network cost by
requiring fewer optical transmit/receive units than a comparable linear add/drop
network. Operationally, a ring network provides significant flexibility to increase
bandwidth at existing nodes and to add new nodes at locations where
unanticipated bandwidth is required.
These benefits make rings highly desirable even when fiber route diversity is not
available. When route diversity is not available on part or all of the ring, ring
technology can be used to support split and tapered feeder routes to derive
economic benefits, provide bandwidth flexibility, ease the process of adding and
deleting nodes and supply survivability against single-node failures.
When route diversity is not available or fiber cable cuts are not a driving concern,
the two-fiber path switched ring feature can be applied in a "folded" (a folded ring
is a single path ring) configuration (Figure 2-7). This use of DDM-2000 OC-3,
OC-12, and
SLC-2000 access resource manager (ARM) path switched rings
applies in particular to hubbing and linear topologies where there is no return path
from the end remote site to the central office (CO). While a complete cut through
the fiber cable cannot be protected, single-node equipment failures are still
protected. Furthermore, a two-fiber ring ARM uses only one optical transmitter/
receiver in each direction (two per remote shelf), in contrast to a 1+1 line
protection arrangement that requires four optical transmitter/receivers per remote
shelf. Thus the ring configuration reduces equipment costs, a benefit independent
of its survivability advantage. The ring topology also makes node addition/deletion
straightforward.
Figure 2-7.
Folded Ring Configuration
OC-3
DDM-Plus
DDM-2000
OC-3
SLC 2000
T1
QUAD
DS1
VF, DS0,
ISDN
DS1
Access
System RT
SLC 2000
MSDT
VF, DS0,
ISDN
DS1
OC-3
RT Site
OC-3
DACS IV 2000
Central Office
DDM-2000
OC-3
OC-3
TO:
5ESS
RT Site
DDM-Plus
VF,
DS0
RT
DS1
SLC 2000
Access System
T1
QUAD
DS1
Switch etc.
DS1,
EC-1
R
R
R
R
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 ...