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Q QoS
See “quality of service” (p. GL-23) for definition.
quality of service (QoS)
A set of performance parameters that characterize the transmission quality over a given virtual
connection.
QoS can be quantitatively indicated by channel or system performance parameters, such as
signal-to-noise ratio, bit error ratio, message throughput rate, and call blocking probability.
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R rack
A rack is the standardized physical framework on which network equipment such as 1830
PSS-36/PSS-32/PSS-16/PSS-4 shelves are mounted. A rack can contain more than one shelf. Also
called bay frames.
random jitter (RJ)
Random jitter is caused by thermal noise and may be modeled as a Gaussian process. The
peak-to-peak value of RJ is of a probabilistic nature, and thus any specific value requires an
associated probability.
receiver
A terminal device that includes a detector and signal processing electronics. It functions as an
optical-to-electrical converter.
receiver sensitivity
The minimum optical power required at a receiver to deliver traffic at a guaranteed bit error rate
(BER). This parameter is specified back-to-back (without the effects of chromatic dispersion or
OSNR degradation).
reconfigurable optical add/drop multiplexer (ROADM)
An optical network element with a configuration that can be changed remotely. The main benefit
of this remote reconfigurability is that it reduces Operating Expenditures (OPEX) when operating
a DWDM network. OPEX is reduced because the ROADM eases network provisioning and line
tuning at both the initial installation and any upgrades (to increase the capacity or re-allocate
resources to a new demand matrix).
regeneration
Electrical signal regeneration. Typically, OTUk Section regeneration and ODUk transparency is
implied in this context.
remote network monitoring (RMON)
Provides statistics for remote performance monitoring. Defined in standard RFC 2819.
repeater
A receiver and transmitter set designed to amplify attenuated signals. Repeaters are used to extend
operating range. See “in-line amplifier” (p. GL-13) for related term.
Glossary
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1830 PSS-36/PSS–32/PSS-16/PSS-4
8DG60888CAAA Release 3.6.0 and 3.6.1
Issue 1 June 2011
GL-23
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