Modem-Option Reference - THOMSON SHDSL Manual

5| Modem Options
5.2

Modem-Option Reference

Following modem options exist on Thomson's SHDSL devices:
atmupfast: this modem option indicates when the ATM Transmission Convergence (TC) layer is enabled.
If disabled, the ATM TC layer is enabled when the DSL link status achieves data mode.
If enabled, the ATM TC layer is already enabled at the beginning of the SHDSL training. This can be
necessary if the DSLAM requires that the ATM TC layer is synchronized within a few seconds.
By default, this option is disabled.
automaster: this modem option indicates whether auto-detection of the master link is enabled or not.
If disabled, auto-detection is disabled.
If enabled, the master link is detected automatically. This can be necessary if the DSLAM uses 4-wire
enhanced mode.
By default, this option is disabled.
fastdrop: this modem option indicates when a link is dropped.
If disabled, the modem receives an event from the physical layer when the link is dropped.
If enabled, the modem drops the link if it receives a trigger indicating that the Signal-to-Noise Ratio
(SNR) dropped below 0 dB. In this case, the link is dropped sooner as the modem does not try to
recover the link first.
By default, this option is disabled.
force-enhanced:
If disabled, auto-detection of standard/enhanced mode is used.
If enabled, the CPE device is forced to start in 4-wire enhanced mode.
By default, this option is disabled.
force-shdsl:
If disabled, the new style capabilities list (CL) is used during G.Hs. If this capabilities list does not
result in a common mode of operation, the old style capabilities list is used.
If enabled, the old style capabilities list is used from the beginning. This way, the CPE is forced to use
the old SHDSL standard (no EFM, no G.SHDSL bis and no M-pair mode). As a result, the
synchronization time decreases if this option is used in case of older DSLAMs, which do not
understand the new style. It also prevents older DSLAMs to end up in a lock-up state.
By default, this option is disabled.
force-tcpam16:
If disabled, the modem supports both 16-TCPAM and 32-TCPAM line coding.
If enabled, the modem is forced to use 16-TCPAM line coding only. Some DSLAMs do not like 32-
TCPAM line coding.
By default, this option is disabled.
force-tcpam32:
If disabled, the modem supports both 16-TCPAM and 32-TCPAM line coding.
If enabled, the modem is forced to use 32-TCPAM line coding only. This option is mainly used for
testing purposes.
By default, this option is disabled.
lineprobing:
If enabled, line probing is enabled.
If disabled, line probing is disabled. This can be useful for test purposes.
By default, this option is enabled.
36
E-DOC-CTC-20080313-0001 v2.0