363-206-295
Applications
2-4
Issue 1
December 1997
The DDM-2000 OC-3 and OC-12 VT1.5 or STS-1 path switched rings operate as
shown in Figure 2-1(a.). Traffic entering a path switched ring node is sent onto
both rotations of the ring. At the receiving node, the signal having the highest
integrity (based on SONET path information) is selected and dropped as outgoing
traffic. At intermediate nodes, the traffic is "passed-through" without changing the
SONET path information. The DDM-2000 OC-3/OC-12's VT1.5/STS-1 Time Slot
Interchange (TSI) capabilities make the provisioning of add/drop and pass-
through traffic quick and easy.
In addition, the backup and restoral capability of CPro-2000 can be used to
significantly reduce the effort and increase the accuracy of installing several
complex ring shelves having similar or identical configurations. After manually
provisioning the first node, CPro-2000 can be used to make a copy of the
configuration. This copy can then be used to quickly and easily configure all of the
remaining nodes using the restoral feature of CPro-2000. Using system backup
and restoral in this fashion provides a much quicker and less error-prone
installation than manual provisioning.
The self-healing nature of the path switched ring is shown in Figure 2-1(b.). In this
case, the fiber failure between nodes C and D causes node C to switch from the
counterclockwise ring to the clockwise ring, thus maintaining service between
node A and C.
A network which requires the bulk of its traffic to be dropped at a single node is an
ideal application for path switched rings. A typical loop feeder network, where
most traffic is between the subscriber loop to a central office, fits this mold. Such
an application calls for the delivery of protected DS1 and DS3 service to customer
locations. In many cases, where the network serves only voice traffic and DS1s, a
DDM-2000 OC-3/
SLC-2000 path switched ring is a perfect fit. If DS3 service or a
mixture of DS1 and DS3 service is needed, multiple OC-3 rings or an OC-12 ring
may be necessary. Cost, fiber availability, and bandwidth flexibility all play a part in
determining whether a single OC-3 ring, multiple OC-3 rings, or an OC-12 ring will
be the best network solution.
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 ...