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Introduction 53
SmartNode 4552 & 4562 Getting Started Guide D • Port pin-outs
Introduction
This section provides pin-out information for the ports of the SmartNode.
Ethernet
Note Pins not listed are not used.
ISDN BRI 0/1 Phone (NT/Net) port
The BRI phone port uses an 8-pin RJ-45 connector (the pinout is shown in table 9).
Note Pins not listed are not used.
Note All pins between the Phone and Line ports are connected during power failure.
Fallback relay operation:
• When the unit is not powered, the fallback relay connects pins 3, 4, 5, and 6 of the net
and the user ports (fallback) together. This enables you to place calls to the PSTN even if
the unit is powered down.
• Line power applied to the Line port is fed through to the Phone port at all times and
independent of the fallback relay’s status.
Table 8. RJ-45 socket
Pin Signal
1 TX+
2 TX-
3 RX+
6 RX-
Table 9. RJ-45 socket
Pin Signal
3 Rx+
4 Tx+
5 Tx-
6 Rx-
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