Paradyne 3551 - Manual (Page 5)

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Table 1. Model 3550 DSU Switch Settings
Switch Position Switch Setting Function
S1 1
ON
(default)
Permissive V.32 DBM transmit output level
of –9 dBm
S1-1
Off Programmable V.32 DBM transmit level
between –12 dBm and 0 dBm
S1 2
ON Frame ground (FG) connected to signal
ground (SG)
S1-2
Off
(default)
FG connected to SG through 100 ohm
resistor
ON is to the rear as you face the front of the DSU.
Off is to the front.