363-206-295
Technical Specifications
10-38
Issue 1
December 1997
DDM-2000 OC-12 Reliability
1
0
Summary
1
0
This section describes the Bellcore reliability requirements that apply to the
DDM-2000 OC-12 Multiplexer and the calculations used to predict how the
DDM-2000 OC-12 Multiplexer meets those standards.
The DDM-2000 OC-12 Multiplexer meets all the applicable Bellcore reliability
requirements that cover transmission availability, OS availability, silent failures,
optical module maintenance, and infant mortality. Table 10-21 summarizes the
reliability predictions and requirements. The applicable Bellcore requirements and
objective were clarified through interactions with Bellcore during their audit of the
DDM-2000 OC-12 Multiplexer. The basis for these requirements comes from
TA-TSY-000418, "Generic Reliability Assurance Requirements for Fiber Optic
Transport Systems." The method and assumptions used to calculate the
DDM-2000 OC-12 Multiplexer reliability predictions are described in the following
sections. Each section is devoted to one of the reliability parameters which must
meet a Bellcore requirement or objective.
Transmission Availability
1
0
Bellcore
requirements state that the probability of a hardware-caused outage on a
two-way channel within a SONET multiplexer should be less than 1.75 minutes
per year in a CO environment
*
and 5.25 minutes per year in a RT environment.
†
Bellcore
objectives for outages are 0.25 minutes per year for the CO
‡
and 0.75
minutes per year for RT environments.
§
The outage requirements and objectives apply to any part of the product needed
to process an incoming high-speed or low-speed signal (DS3 to OC-12 or OC-12
to DS3). An outage is defined, for this and all other outage requirements, as any
1-second interval with a bit error rate of 10
-3
or worse.
¶
The predicted hardware
outages for various configurations of the DDM-2000 OC-12 system are given in
Table 10-21.
A Markov model was used to calculate the predicted system outage. The model
assumes a mean time to repair of 2 hours for the CO environment and 4 hours for
the RT environment. Individual circuit pack failure rates used in the model were
calculated using the method described in TR-TSY-000332, Issue 4, "
Reliability
Prediction Procedure for Electronic Equipment (RPP)." A summary of the circuit
*
TA-NWT-000418, Issue 3, November 1991, p. 17.
†
TA-NWT-000418, Issue 3, November 1991, p. 28.
‡
TA-NWT-000418, Issue 3, November 1991, p. 18.
§
TA-NWT-000418, Issue 3, November 1991, p. 28.
¶
TR-TSY-000009, Issue 1, May 1986, p. 4-11.
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 ...