363-206-295
Circuit Pack Descriptions
7-52
Issue 1
December 1997
General Description of Operation
7
The 21D/21D-U OLIU circuit pack multiplexes three STS-1 signals to an STS-3, inserts
the SONET transport overhead bytes (line and section), and scrambles the resulting
signal. This STS-3 signal drives an LED transmitter to create the IS-3 output.
The received IS-3 signal is converted back to an electrical STS-3. This STS-3 is
descrambled and demultiplexed to three STS-1 signals, and transport overhead is
accessed. Some of the overhead (for example, section datacom channel) is passed via
serial data links to the control packs, while other bytes (for example framing, parity
check) are processed on-board. Finally, the STS-1 signals run through a pointer-
processing step (interpretation and regeneration) to guarantee frame alignment to the
local system clock before they are sent to the TSI slots. Fiber access is via a pair of
ST
(21D) or universal (21D-U) lightguide cable connectors from the 21D/21D-U OLIU
faceplate. The 21D/21D-U OLIU operates
only on multimode cable.
Detailed Description of Operation
7
Figure 7-22 is an overall block diagram of the 21D/21D-U OLIU circuit pack.
Figure 7-22. 21D/21D-U OLIU Circuit Pack Block Diagram
Byte Interleaves
IS-3
Converts IS-3
IS-3
into IS-3
SONET
From
(Service &
OHCTL CP
TSI CPs
STS-1 #3
STS-1 #2
STS-1 #1
Overhead
Timing
-48V B
-48V A
Control
Intrashelf
SYSCTL
To/From
-48V Fuses
Shelf
From
To/From
Protection)
Rx Fiber
Tx Fiber
Disinterleaves a
Processes
3 STS-1s
STS-3 into
Byte
OH
Section and Line
to STS-3
Demultiplexer
Converts STS-3
Bytes of STS-1 #1
and Line OH
Write Section
a STS-3
3 STS-1s into
Multiplexer
STS-1 #3
STS-1 #2
STS-1 #1
STS-1 #3
STS-1 #2
STS-1 #1
Processors
Pointer
TSI CPs
STS-1
STS-1
Protection)
(Service &
To/From
STS-1
Routing
STS-1
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 ...