ZyXEL Communications 2002 Series Podręcznik Użytkownika Strona 54

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VES-1000 Series Ethernet Switch
5-2 Port Setup
Rate adaptation is the ability of the device to adjust the configured transmission rate to the attainable transmission
rate automatically depending on your telephone line quality. The VDSL transmission rate then stays at the new
rate or adjusts if line quality improves or further deteriorates.
If rate adaption is disabled and 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 VES determines line quality using the Signal-to-Noise Ratio (SNR). SNR is the ratio of the amplitude of the
actual signal to the amplitude of noise signals at a given point in time. A low SNR indicates poor line quality.
When the SNR (upstream or downstream) falls below a pre-determined threshold, the device then uses rate
adaption. Rate adaption applies to VDSL line connections only – not Ethernet connections.
See 5.1.1 for the range of speeds you may configure for each VDSL mode.
Enter 6 from the main menu to bring up Menu 6 – Ports Setup.
Figure 5-1
Menu 6 – Ports Setup (VES-1012)
5.1.3 VDSL Port Configuration
Select a VDSL port and then press [ENTER] to go to the VDSL port setup menu.
Menu 6 – Ports Setup
Type Active User Name
1. VDSL Yes JoeSoap
2. VDSL Yes David
3. VDSL Yes Troy
4. VDSL No John
5. VDSL No ____________
6. VDSL No ____________
7. VDSL No ____________
8. VDSL No ____________
9. VDSL No ____________
10. VDSL No ____________
11. VDSL No ____________
12. VDSL No ____________
13. Ethernet Yes Uplink1
14. Ethernet Yes Uplink2
Enter selection Number :
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