Installation Instructions

Important:
The attainable cable length can vary depending on the quality of the fiber-optic cable used.
For more information about SFP transceivers, including technical specifications and installation
instructions, see
SFP on page 23.
Small Form Factor Pluggable plus (SFP+) transceivers
SFP+ transceivers are hot-swappable input and output enhancement components that allow 10
gigabit connections. All Avaya SFP+ transceivers use Lucent connectors (LC) to provide precision
keying and low interface losses.
For more information about SFP+ transceivers, including technical specifications and installation
instructions, see
SFP+ on page 45.
Quad (4-channel) Small Form Factor Pluggable plus (QSFP+)
QSFP+ transceivers are hot-swappable data input and output components that allow 40-gigabit
Ethernet ports to link with other 40-gigabit Ethernet ports. All Avaya QSFP+ transceivers use LC
connectors and MPO/MTP connectors to provide precision keying and low interface losses.
For more information about QSFP+ transceivers, see
QSFP+ on page 66.
Optical power considerations
When you connect the device to collocated equipment, ensure that enough optical attenuation exists
to avoid overloading the receivers of each device. You must consider the minimum attenuation
requirement based on the specifications of third-party equipment. .
Related links
Optical routing system components on page 13
Dispersion considerations for long reach
Precise engineering of transmission links is difficult; specifications and performance are often
unknown, undocumented, or impractical to measure before equipment installation. Moreover, the
skills required to perform rigorous link budget analysis are extensive. Fortunately, a simple,
straightforward approach can assure robust link performance for most optical fiber systems in which
you use Avaya switches and routers.
This method uses an optical power budget, the difference between transmitter power and receiver
sensitivity, to determine whether the installed link can operate with low bit error ratio for extended
periods. The power budget must accommodate the sum of link loss (that is, attenuation), dispersion,
and system margin, described in the following paragraphs.
Link losses are the sum of cabled fiber loss, splices, and connectors, often with an allocation for
additional connectors. Cabled fiber loss is wavelength and installation dependent, and is typically in
the range of 0.20 to 0.5 dB/km. See the cable plant owner or operator for specifications of the cable
you use, particularly if the available system margin is unsatisfactory. Engineered links require
precise knowledge of the cable plant.
For long, high bit rate systems, pulse distortion, caused by the transmitter laser spectrum interaction
with fiber chromatic dispersion, reduces receiver sensitivity. Transceivers for long reach single mode
Optical routing design
April 2016 Installing Transceivers and Optical Components on Avaya VSP Operating System
Software 15
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