Setting The E1 Interface Impedance; Appendix A - TC Communications TC1631R User Manual

The E1 interface impedance on the TC1631R/S is user configurable by changing the jumpers on the interface
module. Please follow the instructions below to set the E1 impedance appropriately.

Setting the E1 Interface Impedance

1. Unscrew the 2 front panel screws and slide the unit out of it's housing.
2. Locate the interface module at board location JP2 (the board plugs vertically into the main board's socket).
3. For 75 ohm impedance, the jumpers on the interface module should be set as follows:
JP2 and JP3------- installed
Figure 7. TC1631R/S's E1 (75 ohm) Interface Module Configuration
4. For 120 ohm impedance, the jumpers on the interface module should be set as follows:
JP2 and JP3------- removed
5. Slide the unit back into the housing and secure the 2 front panel screws.
Figure 8. TC1631R/S's E1 (120 ohm) Interface Module Configuration

Appendix A

JP2
JP2
JP2
JP2
- 18 -
JP3
JP3
TC1631R/S
User's Manual
Rev. 1.6