3. Hardware
15
3.4.2.3
Analog 50-Pin Telco Pin Assignment
The FXO and FXS interface boards have a 50-pin telco receptacle (female) for connecting analog
circuits to the MX250. Figure 3-6 shows the pin placement on the telco connector of the FXS and
FXO cards. Figure 3-7 shows the function assignment of each pin.
3.4.3
PCM (T1 and E1)
3.4.3.1
Usage
The MX250 supports up to two PCM cards through the interface slots. Each card has two
full-duplex circuits which can be configured for either T1 (1.544 Mb/s) or E1 (2.048 Mb/s). Each
circuit uses one of several supported PSTN or IP WAN protocols. The circuit type and protocol
for each circuit are configured through the MX Administrator software.
Pin
Signal Name
Abbreviation
1
(not connected)
—
2
(not connected)
—
3
Ring 1
R1
4
Tip 1
T1
5
(not connected)
—
6
(not connected)
—
Figure 3-5
Pin Description of the Analog RJ12 Connector
Figure 3-6
Pin Assignment of a 50-pin Telco Connector on FXO or FXS Card
Pin
Signal Name
Abbreviation
1 to 8
Tips for circuit 1 to 8
T1 to T8
26 to 33
Ring for circuit 1 to 8
R1 to R8
9 to 25
Unconnected
34 to 50
Unconnected
Figure 3-7
Pin Description of 50-pin Telco Connector
Summary of Contents for MX250
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