Interface Modules (WAN) Passport 4400 Hardware Installation Manual
7-7
ISDN TA S/T Interface Module
There are two user-adjustable straps on the ISDN TA S/T interface module, E3
and E4. These straps are used to configure the ISDN connection. Both straps
are set to the factory default of OUT.
Note:
Refer to Appendix B, Regulatory and Telephone Company
Requirements for agency and telephone company
requirements.
The following optional features are available for the ISDN TA S/T Interface
Module:
• Setting strap E3 to IN adds a 100 ohm terminating resistor to the
receiving channel
• Setting strap E4 to IN adds a 100 ohm terminating resistor to the
transmitting channel
The interface module must be inserted into the unit with the component side
facing down.
Figure 7-8. ISDN TA S/T Interface Module, Connector, and Pin Assignments
E3
E4
O
U
T
I
N
Jumper in
Jumper out
Pin 1
RJ-45
RJ-45 Pin Assignments
1
2
4
5
6
7
8
3
Pins 1, 2, 7, 8 Not Connected
Transmit Data to Network
Receive Data from Network
Receive Data from Network
Transmit Data to Network
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