Chapter 15 xDSL Line Data
Table 29 xDSL Line Rate Info (continued)
LABEL | DESCRIPTION |
Rate | The rate fields display the transmission rates. “Line Down” indicates that the |
| ADSL port is not connected to a subscriber. |
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|
Down/up Stream | These are the rates (in Kbps) at which the port has been sending and receiving |
Rate | data. |
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|
Down/up Stream | These are the DSL line’s downstream and upstream noise margins. Measured |
Noise Margin | in decibels (dB). |
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|
Down/up Stream | These are the reductions in amplitude of the downstream and upstream DSL |
Attenuation | signals. Measured in decibels (dB). |
|
|
Down/up Stream | These are the highest theoretically possible transfer rates (in Kbps) at which the |
Attainable Rate | port could send and receive data. |
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Info |
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Service Mode | This field displays the ADSL standard that the port is using: G.dmt, G.lite, ANSI |
| T1.413 issue 2, ADSL2, or ADSL2+. |
|
|
Trellis Encoding | This field displays whether Trellis encoding is turned on or off. Trellis encoding |
| helps to reduce the noise in ADSL transmissions. Trellis may reduce throughput |
| but it makes the connection more stable.A |
Down Stream | This field displays the number of milliseconds of interleave delay for |
Interleave Delay | downstream transmissions. |
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|
Up Stream | This field displays the number of milliseconds of interleave delay for upstream |
Interleave Delay | transmissions. |
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|
Down Stream | This field displays the amount of power that this port is using to transmit to the |
Output Power | subscriber’s ADSL modem or router. The total output power of the transceiver |
| varies with the length and line quality. The farther away the subscriber’s ADSL |
| modem or router is or the more interference there is on the line, the more power |
| is needed. |
|
|
Up Stream | This field displays the amount of power that the subscriber’s ADSL modem or |
Output Power | router is using to transmit to this port. The total output power of the transceiver |
| varies with the length and line quality. The farther away the subscriber’s ADSL |
| modem or router is or the more interference there is on the line, the more power |
| is needed. |
|
|
Info Atur | The Info Atur fields show data acquired from the ATUR (ADSL Termination Unit |
Info Atuc | – Remote), in this case the subscriber’s ADSL modem or router, during |
| negotiation/provisioning message interchanges. This information can help in |
| identifying the subscriber’s ADSL modem or router. |
| The Info Atuc fields show data acquired from the ATUC (ADSL Termination Unit |
| – Central), in this case |
| interchanges. |
| The vendor ID, vendor version number and product serial number are obtained |
| from vendor ID fields (see |
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|
A.At the time of writing, the
15.2xDSL Performance Screen
These counters display line performance data that has been accumulated since the system started. The definitions of near end/far end are always relative to the
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