User`s manual

CSU/DSU Powerup Configuration
The DIP switch, that configures the initial powerup of the CSU/DSU, can be changed with the daughterboard connected to
the motherboard.
The initial powerup configuration of the CSU/DSU is determined by the DIP Switch settings. This configuration can be
overwritten by AT commands. (Refer to Appendix B for AT commands.)
Refer to Figure 1 for the switch block location. This switch can be changed without separating the daughterboard from the
motherboard. With the boards connected, the OFF label on the switch block is not visible. OFF is away from the base of the
daughterboard, toward the motherboard.
DIP Switch OFF ON
1 Leased Line Switched Line*
2 56K Rate 64K Clear Channel Rate
3 Slave (DDS) Timing Internal Timing
4 &D0 Mode &D2 Mode
DTR off: Command Mode Dropping DTR terminates a
DTR on: Data Mode switched call
*Selecting a switched line will automatically choose a 56K rate with slave timing
Figure 3, DIP switch block