Chapter 52 ADSL Commands
<down max | = | The maximum acceptable DSL downstream signal/noise |
margin> |
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<down min rate> | = | The minimum DSL downstream transmission rate (32- |
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<up down shift | = | The upstream down shift noise margin (0~31 in dB). |
margin> |
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<up up shift | = | The upstream up shift noise margin (0~31 in dB). |
margin> |
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<down down | = | The downstream down shift noise margin (0~31 in dB). |
shift margin> |
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<down up shift | = | The downstream up shift noise margin (0~31 in dB). |
margin>] |
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The profile is a table that contains information on DSL line configuration. Each entry in this table reflects a parameter defined by a manager, which can be used to configure the DSL line.
Note that the default value will be used for any of the above fields that are omitted. The upstream rate must be less than or equal to the downstream rate.
Even though you can specify arbitrary numbers in the profile set command, the actual rate is always a multiple of 32 Kbps. If you enter a rate that is not a multiple of 32 Kbps, the actual rate will be the next lower multiple of 32Kbps. For instance, if you specify 60 Kbps for a port, the actual rate for that port will not exceed 32 Kbps, and if you specify 66 Kbps, the actual rate will not be over 64Kbps.
The DSL up/down shift noise margins define the threshold that triggers rate adaptation. For example:
The target SNR is 6, and the up/down shift noise margins are 9/3.
If the signal becomes better and the SNR is higher than 9, rate adaptation is triggered and the line rate becomes higher
If the signal becomes bad and the SNR is lower than 3, rate adaptation is triggered and the line rate becomes lower.
The following example creates a premium profile (named gold) for providing subscribers with very high connection speeds and no interleave delay. It also sets the upstream target signal/ noise margin to 5 db, the upstream minimum acceptable signal/noise margin to 0 db, the upstream maximum acceptable signal/noise margin to 30 db, the upstream minimum DSL transmission rate to 128 Kbps, the downstream target signal/noise margin to 5 db, the downstream minimum acceptable signal/noise margin to 0 db, the downstream maximum acceptable signal/noise margin to 30 db and the downstream minimum DSL transmission rate to 256Kbps.
The upstream down shift noise margin is 0 dB. The upstream up shift noise margin is 6 dB. The downstream down shift noise margin is 0 dB. The downstream up shift noise margin is 6 dB.
Figure 216 DSL Port Profile Set Command Example 1
ras> adsl profile set gold fast 1200 24000 5 0 30 128 5 0 30 256 0 6 0 6
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