ZyXEL Communications VES1724-56 User Manual page 60

Chapter 7 System Status and Port Statistics
Table 7 Status: VDSL Port Details (continued)
LABEL
Interleaving
Depth
Interleaving
Block
Actual Latency
Path
Ptm Status
Actual RA Mode
Retransmission
Mode
G.INP Framing
Type
60
DESCRIPTION
This field displays the actual interleaving depth. The value ranges from 1 to 4096 with an
increment of 1. The value 1 indicates no interleaving.
This field displays the actual interleaving block length. The value ranges from 4 to 255
with an increment of 1.
This field displays the ID of the channel the Switch is using for that port. All the following
fields describe the status for this channel.
Packet Transfer Mode is a packet-based (for example, for Ethernet packets, IP packets,
etc.) transmission method applied in VDSL2. It can highly increase the efficiency of
packet transmission.
This field displays the current state of the VDSL channel in packet transfer mode.
noDefect: means both Switch and CPE device did not detect any failure or the channel is
not using packet transfer mode.
outOfSync: means an out of synchronization failure was detected.
This field displays actual rate adaptive mode.
n/a: no CPE device is connected to this port.
RA mode at init: the Switch keeps the transmission rate negotiated between the Switch
and CPE devices. It ranges from the configured minimum to the maximum net data rate
(set in the VDSL Setup > VDSL Profile > ChanProfile screen) based on the initial line
condition. The Switch automatically resumes a dropped link and adjusts the data rate
back to the allowed range.
Fixed rate mode: the Switch fixes the transmission rate as the minimum net data rate
and disables transmission rate adjustment. If the attainable speeds cannot match
configured speeds, then the VDSL link may go down or link communications may be
sporadic due to line errors and consequent retransmissions. The Switch does not
automatically resume a dropped link if you use this mode.
Dynamic rate adaptation: the Switch dynamically changes the transmission rate
negotiated between the Switch and CPE devices during initialization as well as during
SHOWTIME status. This mode increases the line's stability and avoid the line being easily
dropped when noise occurs. However, it may cause crosstalk noise during transmission
rate adjustment.
SOS enabled: the Switch uses the emergency rate adjustment system for immediate
rate adjustment to avoid crosstalk noise. See
This field displays G.INP retransmission mode.
n/a: no CPE device is connected to this port.
RTX in use: G.INP retransmission is enabled on the Switch.
Mode Forbidden: G.INP retransmission is disabled on the Switch.
CPE not support: The connected CPE device does not support G.INP retransmission.
This field displays the DTU (Data Transfer Unit) framing type used when G.INP is
enabled.
0: G.INP is disabled on the Switch.
1: The DTU doesn't contain an 8-bit CRC.
2: There is an additional 8-bit CRC inserted at the end of the DTU.
3: An 8-bit CRC is inserted as the first octet of the DTU.
4: An 8-bit CRC is inserted as the first byte of the DTU.
SOS on page 100 for more information.
VES1724-56 User's Guide