363-206-295
Circuit Pack Descriptions
7-60
Issue 1
December 1997
Protection Circuitry
7
Optional 1+1 nonrevertive unidirectional line protection switching compliant with
SONET specifications is provided. The 21G/21G-U/21G2-U OLIU is protection
switched by the SYSCTL in response to an external command, incoming signal
failure, or internal equipment fault. The 21G/21G-U/21G2-U OLIU circuit pack is
protection switched with the optical line.
The 21G/21G-U/21G2-U OLIU interfaces with STS-1 signals from the circuit
packs in the main and function unit slots in an OC-3 shelf, or TSI slots in an OC-12
shelf, and selects the signals from the service or protection slot of each pair as
directed by the SYSCTL.
The 21G/21G-U/21G2-U OLIU provides selectors for timing signals from the TGS
circuit packs, monitors these inputs, and autonomously selects either one. The
SYSCTL can inhibit autonomous selection and make its own selection.
Fault Detection Circuitry
7
The 21G/21G-U/21G2-U OLIU circuit pack has in-service and out-of-service built-
in test capability. In-service testing is continuous and errors are reported when
they occur to the SYSCTL via the intra-shelf control bus. An out-of-service test is
performed whenever the 21G/21G-U/21G2-U OLIU circuit pack is inserted or
recovers from a transient failure.
Performance Monitoring
7
The 21G/21G-U/21G2-U OLIU provides PM circuitry for the following performance
parameters:
■
Laser bias current threshold (21G and 21G-U only)
■
Transmit optical power threshold (21G and 21G-U only)
■
SEFS
■
Line parameters derived from B2 coding violations.
Power Circuitry
7
Power for the 21G/21G-U OLIU circuit pack is provided by two DC-to-DC
converters located on the 21G/21G-U OLIU circuit pack. One converter supplies
+5 volts and the other supplies
−
5.2 volts. Both A and B
−
48 volt backplane
busses supply power to the converters through diode ORed circuit pack-mounted
power select circuits and a circuit pack-mounted fuse. Failure of the fuse or either
converter causes the red FAULT LED to light.
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 ...