
Installing the Model 3551 DSU
Figure 3-1. Model 3551 DSU Switch and Jumper Locations
Table
Model 3551 DSU Switch Settings
Switch Position | Switch Setting | Function | |
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| ON | Permissive V.32 DBM transmit output level of ±9 dBm | |
(default) |
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|
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Off | Programmable V.32 DBM transmit level between ±12 dBm and | ||
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| 0 dBm | |
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| ON | Frame ground (FG) connected to signal ground (SG) | |
|
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Off | FG connected to SG through 100 ohm resistor | ||
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| (default) |
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ON is to the rear as you face the front of the DSU. |
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Off is to the front. |
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December 1996 |