ZyXEL Communications PLA-402 v3, Руководство пользователя

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Chapter 6 The OS X Configuration Utility
PLA-402 v3 User’s Guide
53
Table 11 Link Information
LABEL DESCRIPTION
Link Characteristics
Source Address
This is the MAC address of the local powerline adapter. The local
powerline adapter is the one connected directly to your
computer. A MAC address is a number that uniquely identifies a
device in a network.
Destination Address This is the MAC address of a remote powerline adapter. A
remote powerline adapter is in the same powerline network as
the local powerline adapter but is not connected directly to your
computer.
Show Statistics Click this button to show detailed link information between the
local and remote power adapters..
Statistics
Avg. Pre-FEC Bit Error
Rate
In powerline networks data is sent in physical blocks (PB). This
field shows the average percentage of errors in the physical
blocks received by the destination device from your source
device before the errors are corrected using FEC (Forward Error
Correction). Forward Error Correction (FEC) is a system where
the sender adds redundant data to its transmissions. It allows
the receiver to correct errors without the need of asking the
sender to resend the data.
A high error rate may not necessarily result in a poor connection
as PBs with errors are discarded and the coaxial device adjusts
the signal to a frequency level where fewer errors occur.
Avg. Source PB CRC
Error Rate This field displays the average CRC (Cyclic Redundancy Check)
error rate of transmission from the source device (as shown in
the screen) received by destination coaxial device.
A Cyclic Redundancy Check (CRC) is used as a checksum to
detect alteration of data during transmission. The CRC error
check is performed after Forward Error Correction. If the error
rate after FEC error correction is still high, then this indicates a
lot of noise at all frequencies on this section of your powerline
coaxial network. Data transmission rates are reduced if there is
a lot of noise on the line.
Avg. Destination PB
CRC Error Rate A Cyclic Redundancy Check (CRC) is used as a checksum to
detect alteration of data during transmission. This field displays
the average CRC (Cyclic Redundancy Check) error rate of
transmission from the destination coaxial device to the source
device (as shown in the screen).
The CRC error check is performed after Forward Error
Correction. If the error rate after FEC error correction is still
high, then this indicates a lot of noise at all frequencies on this
section of your powerline coaxial network. Data transmission
rates are reduced if there is a lot of noise on the line.