Ubiquiti AF-3X User Manual Download Page 29

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Chapter 7: Advanced Tab

airFiber

X User Guide

Ubiquiti Networks, Inc.

DATA Port Ethernet Settings

DATA Speed

This is the speed of the

Data

port.

The default is Auto. The airFiber X radio automatically

negotiates transmission parameters, such as speed and
duplex, with its counterpart. In this process, the networked
devices first share their capabilities and then choose the
fastest transmission mode they both support.
To manually specify the maximum transmission link
speed and duplex mode, select one of the following
options:

100 Mbps‑Full

100 Mbps‑Half

10 Mbps‑Full

, or

10 Mbps‑Half

To disable the Ethernet data port, select

Disabled

Note:

Disabled

is selected, ensure that the radio

is accessible using the

Management

Ethernet port

or over the RF link (with in-band management
enabled), or all communication with the radio will
be lost.

Full-duplex mode allows communication in both
directions simultaneously. Half-duplex mode allows
communication in one direction at a time, alternating
between transmission and reception.

Flow Control

If enabled, the airFiber X radio generates

and responds to Ethernet layer PAUSE frames. The

airFiber X radio regulates inbound traffic from the

customer’s network to avoid buffer overflows within the

airFiber X radio. Flow control has the effect of controlling

the inter-packet spacing of packets headed into the
airFiber Data interface.

Multicast Filter

If enabled, the filter blocks multicast

traffic from overloading the CPU when in-band

management is enabled. This allows the airFiber X radio

to be managed in-band when the customer’s network is
carrying large volumes of multicast traffic, such as IPTV.
The filter does not block multicast traffic going over
the radio; it simply blocks it from reaching the airFiber’s
management interface CPU.

Track Radio Link

If this option is enabled, the airFiber X

radio disconnects the Data port’s Ethernet link when the
RF link is lost (The Management port is never disabled by
this option). The

Track Radio Link

option is useful because

it quickly indicates a “link lost” condition to the customer’s
routing equipment (such as a direct connection to
OSPF-enabled routers).
•

Disabled

The

Track Radio Link

option is disabled by

default. The Data port’s Ethernet link will always remain
up regardless of the RF link state.

•

Use Timeout Duration

This option is designed for use

by operators who are using in-band management. Two
timers control the Data port’s Ethernet link.

RF Link

Ethernet Link

Notes

Goes down for
the first time

The Ethernet link goes
down and remains
down for the number
of seconds specified by
the

Link Off Duration

timer.

The Ethernet link will
then come back up

so that the airFiber X

radio can be managed
even when the RF link
is down.

Even if the RF link goes
back up before the

Link Off Duration

timer

elapses, the Ethernet
link remains down.

The Ethernet link’s
downtime is long
enough to signal to
the customer’s routing
equipment that the
path is lost.

Goes down
for the

second time

The Ethernet link
remains up as long as
time remains on the

Link Off Spacing

timer.

When the

Link Off

Spacing

timer elapses,

then the Ethernet link
goes down again for
the number of seconds
specified by the

Link

Off Duration

timer. (This

happens only if the RF
link is still down.)

The Ethernet link’s
uptime is long enough
so the operator has
enough time to access

the airFiber X radio,

make configuration
changes, and save those
changes.

Sufficient Ethernet link
uptime is vital when a
RF link is constantly up
and down.

If the

Use Timeout Duration

option is enabled, the

Track

Radio Link

option and the following timers are enabled:

Link Off Duration

The

Link Off Duration

timer

controls the length of time the Data port’s Ethernet
link will be down if the RF link goes down. Enter the
number of seconds that the Ethernet link should be

offline. For example, if this is set to 10 seconds, then

when the RF link goes down, the Ethernet link will go

down and remain down for 10 seconds (regardless of

the RF link state), and then it will go back up.

Link Off Spacing

The

Link Off Spacing

timer controls

the length of time the airFiber X radio will wait before

allowing the Data port’s Ethernet link to go down for a
second time if the RF link goes down again. Enter the
minimum interval (in seconds) between offline events
of the Ethernet link, regardless of the RF link status.
The value for

Link Off Spacing

should be larger than the

value for

Link Off Duration

, and it should be enough

time for the operator to access the airFiber X radio,

make any configuration changes, and apply those
changes.

Note:

If the

Link Off Spacing

timer is set to

0 seconds, then the Ethernet link will only use the
Link Off Duration