ZyXEL Communications IES-1000 User Manual page 204

The results contain the operating modes, interleave delay, parity byte assignment and parity bytes per codeword,
symbols per codeword and interleave depth. Information obtained prior to training to steady state transition will
not be valid or will be old information. Annex A refers to POTS.
LABEL
Service Type in
Operation
Number of
Channels
Downstream
Framing
Structure
Active down/up
stream rate
option
TRELLIS
operation mode
is
Down/up stream
interleaved
Delay
Downstream
Parity byte
assigned to
fast/interleaved
Upstream
Parity byte
assigned to
fast/interleaved
Downstream
Symbols assigned
to
fast/interleaved
Upstream
Symbols assigned
to
fast/interleaved
1
At the time of writing, the AAM1008 always uses Trellis coding.
ADSL Commands
Table 24-1 Lineinfo Command
This is the ADSL standard that the port is using: G.dmt (AAM1008-61), G.dmt Annex B
(AAM1008-63), ETSI (AAM1008-63), G.lite or ANSI T1.413 issue 2 (AAM1008-61).
An ADSL port on the network module uses one downstream channel and one upstream
channel.
This displays the framing mode that the network module uses on the traffic that it sends.
"0" is full overhead framing with the synchronization control mechanism enabled
(asynchronous bit-to-modem timing)
"1" is full overhead framing with the synchronization control mechanism disabled
(synchronous bit-to-modem timing).
"2" is reduced overhead framing with separate fast and synchronization bytes in the
respective fast and interleaved latency buffers. This produces 64 kilobits per second of
framing overhead.
"3" is reduced overhead framing with a merged fast and synchronization byte, using either
the fast or the interleaved latency buffer. This produces 32 Kbps of framing overhead.
This is the rate option currently being used for the down/upstream channel.
Trellis coding helps to reduce the noise in ADSL transmissions. Trellis may reduce
throughput but it makes the connection more stable.
The numbers of milliseconds of interleave delay for downstream and upstream
transmissions are listed.
This is the current number of downstream parity bytes (FEC Redundancy) per Reed
Solomon codeword that are assigned to the fast or interleaved buffer.
This is the current number of upstream parity bytes (FEC Redundancy) per Reed Solomon
codeword that are assigned to the fast or interleaved buffer.
This is the current number of downstream symbols per Reed Solomon codeword value
that are assigned to the fast or interleaved buffer. This should always be 1 for fast mode.
This is the current number of upstream symbols per Reed Solomon codeword value that
are assigned to the fast or interleaved buffer. This should always be 1 for fast mode.
DESCRIPTION
1
IES-1000 User's Guide
24-5