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S1-8: TX Clock
S2-1: Front Panel Switches
The 3088RC uses front panel switches to control test modes. They may
be disabled so that the 3088RC ignores them.
S2-2: Line Probe
Line probe is a mechanism that determines the highest rate (192K to
2304K) that the DSL link can reliably support. This takes place during
training. The DSL rate will be set to the rate that line probe determines.
Note that both the CO and CPE unit must have line probe enabled for it
to take effect.
Line probe could be used to determine the best rate the line will support,
and then the user could set the units for that rate and disable line probe
so that the rate won’t change without the user’s knowledge.
S2-3: Annex A/B
Annex A is typically used in North American-like networks, whereas
Annex B is typically used in European-like networks. The different
annexes specify different PSD (power spectral density) masks because
of the difference in T1 and E1 PSDs.
S1-8 Setting Description
ON Normal TD sampled on falling edge of TX clock.
OFF Inverted TD sampled on rising edge of TX clock.
S2-1 Front Panel Switches
ON Disabled
OFF Enabled
S2-2 Line Probe
ON Disabled
OFF Enabled
S2-3 Annex
ON A
OFF B