Configuring SHDSL Operating Mode on an ATM Physical Interface

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To configure the SHDSL operating mode on the physical ATM interface, include the shdsl-options statement at the [edit interfaces at-pim/0/port] hierarchy level:



[edit interfaces at-pim/0/port]

shdsl-options {

annex (annex-a
| annex-b);

line-rate line-rate;

loopback (local | remote);



snr-margin {

current margin;

snext margin;
}


}

Configure the following SHDSL options:

annex—The type of annex:
- annex-a—Use for North American SHDSL network implementations.
- annex-b—Use for European SHDSL network implementations.
line-rate—The SHDSL line rate. The default for 2-wire mode is auto. The default for 4-wire mode is 4608 Kbps.
loopback—A loopback connection, local or remote.
- local—Use to troubleshoot physical PIC errors. A local loopback loops packets, including both data and timing information, back on the local routing platform’s PIM.
- remote—Use to troubleshoot physical circuit problems between the local router and the remote router. A remote loopback loops packets, including both data and timing information, back on the remote routing platform’s PIC.
snr-margin— The SHDSL signal-to-noise ratio (SNR) margin, current or snext. The SNR margin is the difference between the desired SNR and the actual SNR.
- current—Current SNR is the difference between desired SNR and the actual SNR. When configured, the line trains at higher than current noise margin plus SNR threshold.
- snext—Self-near-end crosstalk (SNEXT) SNR margin line trains the line at higher than SNEXT threshold.

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