Cable and Port Pinouts

This appendix lists the pinouts for the Ethernet cable connector and ports on the Catalyst 8540 route processor and unshielded twisted-pair (UTP) line module. It includes the following sections:

Note Pins not listed are not connected.

Ethernet Cable Connector Pinouts

The Ethernet ports on the route processor and the UTP line module are RJ-45 receptacles. Table B-1 lists the Ethernet cable connector pinouts.

Note The Ethernet port on the route processor is not routable.
Table B-1: RJ-45 Ethernet Cable Connector Pinouts

Pin	Signal	Direction	Description
1	RxD+	<---	Receive data +
2	RxD-	<---	Receive data -
3	NC	---	No connection
4	NC	---	No connection
5	NC	---	No connection
6	NC	---	No connection
7	TxD+	--->	Transmit data +
8	TxD-	--->	Transmit data -

Note To connect a Catalyst 8540 device to a router (such as the Cisco 7500 router) with UTP cable, use a straight-through cable. To connect the device to a switch (such as the Catalyst 5500 switch), use a crossover cable.

Console Port Pinouts

The console port on the route processor is an EIA/TIA-232, data communications equipment (DCE), DB-25 receptacle. Both data set ready (DSR) and data carrier detect (DCD) are active when the system is running. The Request To Send (RTS) signal tracks the state of the Clear To Send (CTS) input. The console port does not support modem control or hardware flow control. The console port requires a straight-through EIA/TIA-232 cable. Table B-2 lists the console port pinouts.

Table B-2: DB-25 Console Port Pinouts

Pin Signal Direction Description

1

GND

-

Ground

2

TxD

<---

Transmit data

3

RxD

--->

Receive data

4

RTS

--->

Ready to send¹

5

CTS

--->

Clear to send¹

6

DSR

--->

Data set ready (always on)²

7

GND

-

Ground

8

DCD

--->

Data carrier detect (always on)²

20

DTR

<---

Data terminal ready

Shield

GND

-

Shield ground

¹Pins 4 and 5 are connected.
²Pins 6 and 8 are connected.

Pin	Signal	Direction	Description
1	GND	-	Ground
2	TxD	<---	Transmit data
3	RxD	--->	Receive data
4	RTS	--->	Ready to send¹
5	CTS	--->	Clear to send¹
6	DSR	--->	Data set ready (always on)²
7	GND	-	Ground
8	DCD	--->	Data carrier detect (always on)²
20	DTR	<---	Data terminal ready
Shield	GND	-	Shield ground

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