Chapter 13 xDSL Port Setup
Table 20 xDSL Port Setting (continued)
LABEL | DESCRIPTION |
L2 Time | Set minimum time (in seconds) that the ADSL line must stay in the L2 power |
| mode before reducing the power again in the L2 power mode. |
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L2 ATPR | Set the maximum Aggregate Transmit Power Reduction (ATPR) in decibels (dB) |
| that is permitted in a L2 power reduction. The system can gradually decrease |
| the ADSL line transmission power while it is in the L2 power mode. This is the |
| largest individual power reduction allowed in the L2 power mode. |
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L2 ATPRT | Set the maximum Aggregate Transmit Power Reduction Total (ATPRT) in |
| decibels (dB) that is permitted in the L2 power mode. This is the total transmit |
| power decrease that is allowed to occur in the L2 power mode. |
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|
Max L2 Rate | Set the maximum transfer rate (in Kilobits per second) that is permitted while the |
| port is in the L2 power mode. The supported range is 32~4096 Kbps in 4 Kbps |
| increments. If you enter a number that is not a multiple of 4, the system uses the |
| next lower multiple of 4. If you enter 39, for example, the system will use 36. |
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|
Min L2 Rate | Set the minimum transfer rate (in Kilobits per second) that is permitted while the |
| port is in the L2 power mode. The supported range is 32~4096 Kbps in 4 Kbps |
| increments. If you enter a number that is not a multiple of 4, the system uses the |
| next lower multiple of 4. If you enter 39, for example, the system will use 36. |
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|
L0 to L2 Rate | Set the down stream transfer rate (in Kilobits per second) that serves as the |
| threshold for whether the port is to use the L0 or the L2 power mode. The |
| system changes from L0 mode to L2 mode when the downstream transfer rate |
| stays below this threshold for L0 Time. The system changes back from L2 |
| mode to L0 mode when the downstream transfer rate goes above this threshold. |
| This rate must be less than or equal to one half of the Min L2 Rate and at least |
| 16 Kbps. |
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|
Use this part of the screen to mask carrier tones. Masking a carrier tone disables the use of that tone on the ADSL port. Do this to have the system not use an ADSL line’s tones that are known to have a high noise level. Each mask can use up to 8 hexadecimal digits (00000000~ffffffff). Each hexadecimal digit represents 4 tones. The hexadecimal digit is converted to binary and a '1' masks (disables) the corresponding tone. The most significant bit defines the lowest tone number in a mask.
US Carrier | Mask0 represents tones 0~31. |
| Mask1 represents tones 32~63. |
| The most significant bit defines Tone 0. In other words, 0x00000001 means tone |
| 31. For example, you could use 0xfffff000 to disable upstream carrier tones |
| 0~19 and leave tones 20 ~ 31 enabled. |
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|
DS Carrier0 | Mask1 represents tones 32~63 |
(32~255) | Mask2 represents tones 64~95 |
| Mask3 represents tones 96~127 |
| Mask4 represents tones 128~159 |
| Mask5 represents tones 160~191 |
| Mask6 represents tones 192~223 |
| Mask7 represents tones 224~255 |
| For example, use 0x01000000 in Mask2 to disable downstream carrier tone 71. |
| Use 0x03000000 in Mask2 to disable downstream carrier tones 70 and 71. |
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