3. Hardware
17
Important
Do not use Ethernet cables for connecting the PCM circuits. The cables that are
used for PCM are different from those used for Ethernet. Ensure that the cable
you use are properly wired as shown in figure 3-9.
3.4.4
ISDN BRA (S/T Interface)
3.4.4.1
Usage
The MX250 supports up to three BRA cards through the interface slots. Each card has four S/T
circuits. The protocol for each circuit is configured through the MX Administrator software.
3.4.4.2
BRA RJ45 Pin Assignments
Each ISDN BRA circuit terminates on an RJ45 connector. Figure 3-11 shows the pin assignment
for the RJ45 connectors on the BRA card. Each circuit on the BRA card has the same pin
assignment. Each connector has the same pin assignment. Figure 3-12 shows the function
assignment of each pin.
Figure 3-11
Pin Assignment of the ISDN BRA (S/T) Circuits on BRA Interface Card
Pin
Signal Name
Circuit
1
not connected
NC
2
not connected
NC
3
Transmit + (tip)
Tx+
4
Receive + (tip)
Rx+
5
Receive – (ring)
Rx–
6
Transmit – (ring)
Tx–
7
not connected
NC
8
not connected
NC
Figure 3-12
Pin Description of the ISDN BRA (S/T) Circuit
Summary of Contents for MX250
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