Nortel Networks Passport 4400 - Manual (Page 65)

Ethernet Base Module and Interface Modules Passport 4400 Hardware Installation Manual
5-7
ISDN S/T Interface Module
There are two user-adjustable straps on the ISDN 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.
• 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.
Figure 5-11. Front and Back View of ISDN S/T Interface Module
Figure 5-12. ISDN S/T Interface Module Connector
Note: The interface module must be inserted into the unit
with the component side facing down.
Rear View
ISDN S/T
E3
E4
OUT
IN
Jumper in
Jumper out
Pin 1
RJ45 RJ45 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