AT&T Data Service Units 3551 Manual Do Utilizador
Installing the Model 3551 DSU
3-3
3550-A2-GB20-10
February 1995
Figure 3-1. Model 3551 DSU Switch and Jumper Locations
Table 3-1
Model 3551 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
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.
Off is to the front.