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Technical Specifications
10-72 Issue 3 June 2001
DDM-2000 OC-3 Reliability 10
Summary 10
This section describes the Telcordia Technologies reliability requirements that
apply to the DDM-2000 OC-3 Multiplexer and the calculations used to predict how
the DDM-2000 OC-3 Multiplexer meets those standards.
The DDM-2000 OC-3 Multiplexer meets all the applicable Telcordia Technologies
reliability requirements that cover transmission availability, OS availability, optical
module maintenance, and infant mortality. A summary of the reliability predictions
and requirements is shown in Table 10-30. The applicable Telcordia
Technologies requirements and objectives were clarified through interactions with
Telcordia Technologies during their audit of the DDM-2000 OC-3 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 DDM-2000
OC-3 Multiplexer reliability predictions are described in the following paragraphs.
Each paragraph is devoted to one of the reliability parameters which must meet a
Telcordia Technologies requirement or objective.
Transmission Availability 10
Telcordia Technologies
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.
â€
Telcordia Technologies
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 (DS1 to OC-3 or OC-3 to
DS1). 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-3 system are given in
Table 10-30.
* 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.
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