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6 OnSite 2621 & 2635 Quick Start Guide
5.0 Connect the WAN port
5.1 Model 2621
The X.21 interface can be configured as a DTE (factory default), or as a DCE via internal configuration jumper.
When the local third-party equipment is configured as DTE, the Model 2621 X.21 serial port can be configured as
DCE, and a regular straight-through cable can then be used.
1. If you will be using the Model 2621 as a DTE, go to step 5. Otherwise, to configure the X.21 port as
a DCE, open the OnSite’s case by inserting a screwdriver into the slots and twist the screwdriver head
slightly. The top half of the case will separate from the lower half of the case (see figure 4). Be care-
ful not to insert the screwdriver too far into the case so you do not damage the PC board
mounted components.
Figure 4. Case being opened with a screwdriver
2. Locate the small daughter board on the Model 2621 board to the right of the DB-15 connector (figure 5
shows location of DTE/DCE daughter board).
Figure 5. Location of DTE/DCE board
3. The DTE/DCE daughter board is installed at the factory with the DTE label and arrows pointing towards
the X.21 connector (DTE configuration). To change to DCE configuration, lift the daughter board from the
In this example, the DCE/DTE strap is
configured for DCE because the “DCE” label
on the strap is pointed toward the
X.21 connector
X.21 connector