Installation Instructions

Chapter 9: QSFP28
This chapter provides installation procedures and specifications for 100 Gigabit Ethernet Quad
Small Form Factor Pluggable 28 (QSFP28) transceiver modules.
QSFP28 transceivers
This section describes how to select, install, and remove Quad (4-channel) Small Form Factor
Pluggable 28 (QSFP28) transceiver modules.
Use a QSFP28 transceiver for 100 Gigabit per second (Gbps) Ethernet connections over optical
fiber. Alternatively, you can use a direct attach cable (QSFP28 to QSFP28 DAC) to connect ports for
cable distances of up to 5 meters.
Note:
QSFP28 transceivers and DACs are supported on 100 Gigabit Ethernet QSFP28 ports only.
Important:
• The switch operates in strict mode for QSFP28 transceivers, which means that the switch
will not bring the port up operationally when using non-Avaya QSFP28 transceivers.
• The switch operates in forgiving mode for 100 Gigabit QSFP28 direct attach cables (DAC),
which means that the switch will bring up the port operationally when using non-Avaya
DACs. Avaya does not provide support for operational issues related to DACs not qualified
by Avaya, but they will operate and the port link will come up.
Note:
Although the switch supports 100 Gigabit DAC in forgiving mode, the output to the
command show pluggable-optical-modules basic displays the corresponding
vendor names instead of leaving the vendor name blank as in the releases prior to
VOSS 4.2.1.
• Avaya recommends the use of Avaya branded QSFP28 transceivers as they have been
through extensive qualification and testing. Avaya will not be responsible for issues related
to non-Avaya branded QSFP28 transceivers.
May 2017 Installing Transceivers and Optical Components on VOSS 71
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