363-206-295
Administration and Provisioning
8-30
Issue 1
December 1997
Single Homed OC-3/OC-12 VT1.5 Path Switched
Ring (0x1)
8
Figure 8-4 shows an example of an OC-3/OC-12 VT1.5 path switched ring (0x1)
single homing application. The figure is placed after the example explanation and
can be removed for reference.
The DDM-2000 OC-12 ring supports ring (0x1) OC-3/IS-3 interfaces in its function
unit slots. These interfaces must be provisioned as ring (0x1). Signals pass
through the DDM-2000 OC-12 transport ring and exit to the DDM-2000 OC-3 ring.
OC-12 function unit slot fn(x)-1 is connected to OC-3 main-1 and OC-12 function
unit slot fn(x)-2 is connected to OC-3 main-2. Switching is not done on the DDM-
2000 OC-12 Multiplexer on these lines, or paths on these lines; rather VT1.5 or
STS-1 level path switching is done on the DDM-2000 OC-3 Multiplexer. This
allows DDM-2000 OC-3 nodes running ring software to interface with DDM-2000
nodes of an OC-12 ring in such a way as to provide ring-on-ring architecture.
Each OC-3 ring so supported occupies up to three STS-1 time slots on the OC-12
ring. Each OC-12 node can provision the same STS-1 time slots as other OC-12
nodes to drop to the OC-3 shelf (to share STS-1s among several OC-3 shelves) or
the OC-12 node can provision different STS-1s at different sites. When ring (0x1)
is used, the OC-12 ring passes the contents of these STS-1 time slots between
the low-speed OC-3/IS-3 lines and OC-12 high-speed lines without terminating
them or performing any path protection switching on them. Up to four OC-3 rings
can be supported in this fashion by an OC-12 ring to maximize the OC-12
bandwidth utilization. This allows access to any and all VT1.5 signals at an OC-12
site. Since the high-speed signals from the OC-3 ring(s) are sent as two copies
(one clockwise, the other counterclockwise) on the OC-12 ring, the OC-12 ring
capacity is limited to the OC-12 line rate.
The OC-3/IS-3 lines between an OC-12 node and an OC-3 node connected in a
ring 0x1 fashion behave like the OC-3 lines between the nodes on an OC-3 ring
and do not perform line level protection switching. Instead, the OC-3 shelves
perform the normal path protection switching functions.
Some points to note for this application are:
■
Ring (0x1) can be thought of as a "ring on ring" with many of the
characteristics of a single ring.
■
Pass-through cross-connections may be required at the VT and STS level.
■
The OC-3 ring can be composed of any three STSs in the OC-12.
■
An OC-12 STS may be the first STS in one extension, the second STS in
another, and the third STS in another.
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 ...