ZyXEL Communications VES1724-56 User Manual page 59

Table 7 Status: VDSL Port Details (continued)
LABEL
Line Attenuation This field displays the upstream/downstream line attenuation the Switch detects
Transmit Power
Trellis
Snr Mode
Last State
Current State
Actual net data
rate
Prev net data
rate
Actual Delay
Actual INP
Receive Power
INP Report
Codeword Size
RFEC
LSYMB
VES1724-56 User's Guide
DESCRIPTION
according to the line length, frequency and the line wire diameter.
Line attenuation increases with line length and frequency. Bigger wires reduce
attenuation.
This field displays the upstream/downstream transmission power of the line. It ranges
from 0 to 25.5 dBm, with 0.1 dB steps for downstream. It ranges from 0 to 25.5 dBm,
with 0.1 dB steps for upstream.
This field displays whether trellis coding is used in the upstream/downstream
transmission.
This field displays whether the upstream/downstream transmitter referred virtual noise
is enabled or disabled.
This field displays the last successful transmitted initialization state for upstream and
downstream directions through the line. The possible states are as shown next.
vtucG9941, vtucQuiet1, vtucChDiscov1, vtucSynchro1, vtucPilot1, vtucQuiet2,
vtucPeriodic1, vtucSynchro2, vtucChDiscov2, vtucSynchro3, vtucTraining1,
vtucSynchro4, vtucPilot2, vtucTeq, vtucEct, vtucPilot3, vtucPeriodic2,
vtucTraining2, vtucSynchro5, vtucMedley, vtucSynchro6, vtucShowtime,
vturG9941, vturQuiet1, vturChDiscov1, vturSynchro1, vturLineprobe,
vturPeriodic1, vturSynchro2, vturChDiscov2, vturSynchro3, vturQuiet2,
vturTraining1, vturSynchro4, vturTeq, vturQuiet3, vturEct, vturPeriodic2,
vturTraining2, vturSynchro5, vturMedley, vturSynchro6, vturShowtime.
This field displays any existing upstream/downstream failure for the line.
NoDefect: No failure was detected.
LossOfFraming: A loss of frame synchronization was detected.
LossOfSignal: A loss of signal was detected.
LossOfPower: A loss of power was detected.
InitFailure: The most recent initialization failed.
This field displays the actual upstream/downstream data transmission rate.
This field displays the previous upstream/downstream data transmission rate just before
the rate changed.
This field displays the actual upstream/downstream interleave delay (in milliseconds)
used on the line.
This field displays the actual impulse noise protection (INP).
This field displays the upstream/downstream receiving power of the line. The range is
from 0 to 25.5 dBm with 0.1 dB steps for both downstream and upstream traffic.
This field displays the method used to compute the actual INP above. Formula displays
if the value is computed according to an INP_no_erasure formula defined in the ITU-T
G.993.2 standard.
This field displays the actual size of Reed-Solomon codeword used in this line. Reed-
Solomon (RS) Code is an error-correction code.
RFEC refers to Redundancy Forward Error Correction. This field displays the actual
number of Reed-Solomon redundancy bytes. The Reed-Solomon code has the capability
to correct errors by adding redundancy bytes. The longer the Reed-Solomon redundancy
bytes the higher the error correction capability.
LSYMB refers to Latency SYMbol Bit. This field displays the actual number of bits per
symbol.
Chapter 7 System Status and Port Statistics
59