363-206-295
Technical Specifications
Issue 1
December 1997
10-39
pack and fan shelf failure rates is shown in Table 10-22 and Table 10-23,
respectively.
Operation System Interface Availability
1
0
The Bellcore objective states that the OS outage should be less than 28 minutes
per year (50 percent hardware, 50 percent software).
*
Therefore, the objective
applies to the TL1/X.25 interface. This objective applies to circuitry needed to
maintain communication from the DDM-2000 OC-12 Multiplexer to the central
office's OS. Since the OS interface is used in the central office, the reliability
model assumes the mean time to repair is 2 hours and the environmental factor is
1.0. Table 10-21 lists the predicted outages for the TL1/X.25 interface.
Optical Module Maintenance Objective
1
0
According to Bellcore, the objective for mean time between failure (MTBF) of a
one-way regenerator is a minimum of 4 years. A regenerator is defined as any
circuit packs that perform the electrical-to-optical and optical-to-electrical
conversion. The failure rate of the 23G/23G-U OLIU is 11400 FITS according to
the RPP method. This translates to a MTBF of 10 years, which meets the
objective.
Infant Mortality
1
0
Bellcore requires that the number of circuit pack failures in the first year of
operation should not exceed 2.5 times the number of failures per year beyond the
first year. The ratio of first year failures to failures in subsequent years is known as
the infant mortality factor (IMF). The requirement is to have an IMF of less than
2.5.
†
DDM-2000 OC-12 Multiplexer circuit packs are subjected to an environmental
stress testing (EST) program. The purpose of the program is to eliminate early life
failures, conduct failure mode analysis on defective circuit packs, and use
corrective action to make the product more reliable. All new circuit pack codes in
manufacturing are subjected to EST. However, based on field return data, when
the early life failures for any circuit pack codes have been minimal and the infant
mortality factor is below 2.5, these circuit pack codes may be subjected only to
sampling EST.
*
TA-NWT-000418, Issue 3, November 1991, p. 36.
†
TA-NWT-000418, Issue 3, November 1991, p. 40.
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 ...