ZyXEL Communications IES-1248-51A, User Manual

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Chapter 18 xDSL Line Data
IES-1248-51V User’s Guide
152
The following table describes the labels in this screen.
Table 29 xDSL Line Rate Info
LABEL DESCRIPTION
Line Performance Click Line Performance to display an ADSL port’s line performance
counters (see
Section 18.3 on page 155 ).
Line Data Click Line Data to display an ADSL port’s line bit allocation (see
Section 18.2 on page 153 ).
Port Use this drop-down list box to select a port for which you wish to view
information.
Refresh Click Refresh to display updated information.
Port Name This section displays the name of the ADSL port.
The rate fields display the transmission rates. “Line Down” indicates
that the ADSL port is not connected to a subscriber.
Down/up Stream
Rate These are the rates (in Kbps) at which the port has been sending and
receiving data.
Down/up Stream
Noise Margin These are the DSL line’s downstream and upstream noise margins.
Measured in decibels (dB).
Down/up Stream
Attenuation These are the reductions in amplitude of the downstream and
upstream DSL signals. Measured in decibels (dB).
Down/up Stream
Attainable Rate These are the highest theoretically possible transfer rates (in Kbps) at
which the port could send and receive data.
Service Mode This field displays the ADSL standard that the port is using: G.dmt, or
ANSI T1.413 issue 2.
Trellis Encoding This field displays whether Trellis encoding is turned on or off. Trellis
encoding helps to reduce the noise in ADSL transmissions. Trellis may
reduce throughput but it makes the connection more stable.
A
Down Stream
Interleave Delay This field displays the number of milliseconds of interleave delay for
downstream transmissions.
Up Stream
Interleave Delay This field displays the number of milliseconds of interleave delay for
upstream transmissions.
Down Stream
Output Power This field displays the amount of power that this port is using to
transmit to the subscriber’s ADSL modem or router. The total output
power of the transceiver varies with the length and line quality. The
farther away the subscriber’s ADSL modem or router is or the more
interference there is on the line, the more power is needed.