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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
Signal type: O = Output; I = Input
Table 8-9
Signal type: B = Bidirectional
Note
Connection only on LAN, not on telecommunication networks!
NCU 1750
Equipment Manual, 10/2023, A5E45627807B AH
Assignment of the Ethernet interfaces X120, X130 and X127 in 10/100 Mbit/s mode
Connector
Pin
1
2
3
4/5
6
7/8
Shield
-
-
Assignment of the Ethernet interfaces X120, X130 and X127 in 1 Gbit/s mode
Connector
Pin
1
2
3
4
5
6
7
8
Shield
-
-
Name
Type
TxD+
O
TxD-
RxD+
I
GND
-
RD-
I
GND
-
-
-
LED green
-
(Link)
LED orange
-
(Activity)
Name
Type
DA+
B
DA-
DB+
DC+
DC-
DB-
DD+
DD-
-
-
LED green
-
(Link)
LED orange
-
(Activity)
8.7 Use of Ethernet interfaces
Remark
Transmit data
Receive data
(terminated internally with 75 Ω; not re‐
quired for data transmission)
Receive data
(terminated internally with 75 Ω; not re‐
quired for data transmission)
On connector housing
Lit: 10 or 100 Mbit/s
Off: No or faulty connection
Flashes: Data exchange
Off: No data exchange
Remark
Bidirectional pair A+
Bidirectional pair A-
Bidirectional pair B+
Bidirectional pair C+
Bidirectional pair C-
Bidirectional pair B-
Bidirectional pair D+
Bidirectional pair D-
On connector housing
Lights up orange: 1000 Mbit/s
Off: No or faulty connection
Flashes: Data exchange
Off: No data exchange
Connecting
73
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