ZyXEL Communications MSC1000G Series, Руководство пользователя

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Chapter 9 Subscriber Port Setup Screens
Management Switch Card User’s Guide
220
Figure 134
ADSL Port Setup: Advanced: Option Mask
The following table describes the fields in this screen.
Table 97
ADSL Port Setup: Advanced: Option Mask
LABEL DESCRIPTION
ALL Use the check boxes to disable individual features. Use the All check box to select every
feature check box.
Disable Trellis Trellis encoding helps to reduce the noise in ADSL transmissions. Trellis may reduce
throughput but it makes the connection more stable.
Disable Reed
Solomon Reed-Solomon performs transmission error correction.
Disable
Upstream/
Downstream
Bitswap Bit swapping allows the system to respond to noise on a tone by sending it’s data on
another tone. The subscriber (ATU-R) equipment must also support this in order for it to
work.
Disable 1-bit
Constellation 1-bit constellation allows the system to send individual bits over DMT tones that can only
support one bit. This allows the connection to use as many of the tones as possible.
Disable Transmit
Windowing Transmit windowing is only available with ADSL2+.
Disable s=0.5
Support(ADSL1
Only) 0.5 support maps two Reed-Solomon code words into one data frame (instead of one) to
increase the maximum G.dmt transmission rate.
Disable G.lite
Rate Limit
(ADSL1 Only) Disabling the G.lite rate limit allows the G.lite upstream transmission rate to be greater
than 512 Kbps.
Disable nitro
mode In nitro mode, the system compresses the ADSL2+ ATM header so fewer bits need to be
transmitted. It additionally increases the DSL connection speed. However, the connected
CPE device should also support this to make it work. Select this to disable the nitro mode.
Current Option
mask is: Selecting or clearing feature check boxes adjusts the current option mask displayed at the
bottom of the screen.
Apply Click Apply to save the changes in this screen to the system’s volatile memory. The
system loses these changes if it is turned off or loses power, so use the Config Save link
on the navigation panel and then the Save button to save your changes to the non-
volatile memory when you are done configuring.
Cancel Click Cancel to close the screen without saving your changes.