Pin assignment
For diagnostic purposes, the RJ45 sockets are each equipped with a green and an orange LED.
This allows the following status information about the respective Ethernet port to be displayed:
Table 8-8
Assignment of the Ethernet interfaces X120, X130 and X127 in 10/100 Mbit/s mode
Connector
Pin
Name
Type
Remark
/('
/('
1
TxD+
O
Transmit data
2
TxD-
3
RxD+
I
Receive data
4/5
GND
-
(terminated internally with 75 Ω; not re‐
quired for data transmission)
6
RD-
I
Receive data
7/8
GND
-
(terminated internally with 75 Ω; not re‐
quired for data transmission)
Shield
-
-
On connector housing
-
LED green
(Link)
-
Lit: 10 or 100 Mbit/s
Off: No or faulty connection
-
LED orange
(Activity)
-
Flashes: Data exchange
Off: No data exchange
Signal type: O = Output; I = Input
Table 8-9
Assignment of the Ethernet interfaces X120, X130 and X127 in 1 Gbit/s mode
Connector
Pin
Name
Type
Remark
/('
/('
1
DA+
B
Bidirectional pair A+
2
DA-
Bidirectional pair A-
3
DB+
Bidirectional pair B+
4
DC+
Bidirectional pair C+
5
DC-
Bidirectional pair C-
6
DB-
Bidirectional pair B-
7
DD+
Bidirectional pair D+
8
DD-
Bidirectional pair D-
Shield
-
-
On connector housing
-
LED green
(Link)
-
Lights up orange: 1000 Mbit/s
Off: No or faulty connection
-
LED orange
(Activity)
-
Flashes: Data exchange
Off: No data exchange
Signal type: B = Bidirectional
Note
Connection only on LAN, not on telecommunication networks!
Connecting
8.7 Use of Ethernet interfaces
NCU 1740
Equipment Manual, 10/2021, A5E51087503B AA
69
