EX9251 Management Cable Specifications and Pinouts

 

Management Cable Specifications

Table 1 lists the specifications for the cables that connect the console and management ports to management devices.

Table 1: Specifications of Cables to Connect to Management Devices

Ports

Cable Specifications

Receptacle

Additional Information

RJ-45 Console port

CAT5e UTP (unshielded twisted pair) cable

RJ-45

Connecting a Device to a Management Console by Using an RJ-45 Connector

Management Ethernet port

Ethernet cable with an RJ-45 connector

RJ-45

Connecting a Device to a Network for Out-of-Band Management

Mini-USB Type-B Console port

Mini-USB cable with standard-A and Mini-USB Type-B (5-pin) connector

Mini-USB

 

Specifications of Cables and Wires That Connect to Ports on the Front Panel in an EX9251 Switch

Table 2 lists the specifications for the cables that connect to management port, console port, and auxiliary port.

Table 2: Cable and Wire Specifications for Ports on the Front Panel

Port

Cable Specification

Cable/Wire Supplied

Maximum Length

Receptacle

Console or auxiliary port

RS-232 (EIA-232) serial cable

1.83-m length with RJ-45/DB-9 connectors

1.83 m

RJ-45 female

Management Ethernet port

Category 5 cable or equivalent suitable for 100Base-T operation

One 4.57-m length with RJ-45/RJ-45 connectors

100 m

RJ-45 autosensing

Grounding Cable and Lug Specifications for EX9251 Switches

To ensure proper operation and to meet safety and electromagnetic interference (EMI) requirements, you must connect an EX9251 switch to earth ground before you connect power to the switch. You must use the protective earthing terminal on the rear panel of the switch chassis to connect the switch to earth ground.

Warning

The switch is installed in a restricted-access location. It has a separate protective earthing terminal on the rear panel of the chassis that must be permanently connected to earth ground to adequately ground the chassis and protect the operator from electrical hazards.

Caution

Before switch installation begins, ensure that a licensed electrician has attached an appropriate grounding lug to the grounding cable that you supply. Using a grounding cable with an incorrectly attached lug can damage the switch.

Grounding Points Specifications for an EX9251 Switch

Two threaded holes are provided on the rear left side of the chassis for connecting the switch to earth ground. The grounding points fit 10–32 screws and are spaced at 0.63 in. (16 mm) centers.

Note

Additional grounding is provided to an AC-powered switch when you plug its power supplies into grounded AC power receptacles.

Grounding Cable Specifications for an EX9251 Switch

The grounding cable that you provide must meet the specifications in Table 3.

Table 3: Grounding Cable Specifications

Cable Type

Quantity and Specification

Grounding

The grounding lug accommodates 14–10 AWG (2–5.3 mm²) stranded wire. The grounding cable that you provide for the chassis must be the same size or heavier than the input wire of each power supply. Minimum recommendations are 14–10 AWG (2–5.3 mm²) stranded wire, 60° C wire, or one that complies with the local code.

Grounding Lug Specifications for an EX9251 Switch

The accessory box shipped with the switch includes two screws used to secure the grounding cable to the grounding points.

USB Port Specifications for an EX Series Switch

The following Juniper Networks USB flash drives have been tested and are officially supported for the USB port on all EX Series switches:

  • RE-USB-1G-S

  • RE-USB-2G-S

  • RE-USB-4G-S

Caution

Any USB memory product not listed as supported for EX Series switches has not been tested by Juniper Networks. The use of any unsupported USB memory product could expose your EX Series switch to unpredictable behavior. Juniper Networks Technical Assistance Center (JTAC) can provide only limited support for issues related to unsupported hardware. We strongly recommend that you use only supported USB flash drives.

All USB flash drives used on EX Series switches must have the following features:

  • USB 2.0 or later.

  • Formatted with a FAT or MS-DOS file system.

  • If the switch is running Junos OS Release 9.5 or earlier, the formatting method must use a master boot record. Microsoft Windows formatting, by default, does not use a master boot record. See the documentation for your USB flash drive for information about how your USB flash drive is formatted.

Console Port Connector Pinout Information for an EX9251 Switch

The console port on an EX9251 switch are RS-232 serial interfaces. This port connects the switch to a console management port.

Table 4 provides the pinout information for the RJ-45 connector. An RJ-45 cable and an RJ-45 to DB-9 serial port adapter are supplied with the switch.

Note

If your laptop or PC does not have a DB-9 male connector pin and you want to connect your laptop or PC directly to an EX9251 switch, use a combination of the RJ-45 to DB-9 female adapter supplied with the switch and a USB to DB-9 male adapter. You must provide the USB to DB-9 male adapter.

Table 4: EX9251 Switches Console Port Connector Pinout Information

Pin

Signal

Description

1

RTS

Request to send

2

DTR

Data terminal ready

3

TxD

Transmit data

4

Ground

Signal ground

5

Ground

Signal ground

6

RxD

Receive data

7

DSR/DCD

Data set ready

8

CTS

Clear to send

RJ-45 to DB-9 Serial Port Adapter Pinout Information

The console port is an RS-232 serial interface that uses an RJ-45 connector to connect to a management device such as a PC or a laptop. If your laptop or PC does not have a DB-9 male connector pin and you want to connect your laptop or PC to the device, use a combination of the RJ-45 to DB-9 female adapter along with a USB to DB-9 male adapter.

Table 5 provides the pinout information for the RJ-45 to DB-9 serial port adapter.

Table 5: RJ-45 to DB-9 Serial Port Adapter Pinout Information

RJ-45 Pin

Signal

DB-9 Pin

Signal

1

RTS

8

CTS

2

DTR

6

DSR

3

TXD

2

RXD

4

GND

5

GND

6

RXD

3

TXD

7

DSR

4

DTR

8

CTS

7

RTS

RJ-45 Management Port Connector Pinout Information

Table 6 provides the pinout information for the RJ-45 connector for the management port on Juniper Networks devices.

Table 6: RJ-45 Management Port Connector Pinout Information

Pin

Signal

Description

1

TRP1+

Transmit/receive data pair 1

2

TRP1-

Transmit/receive data pair 1

3

TRP2+

Transmit/receive data pair 2

4

TRP3+

Transmit/receive data pair 3

5

TRP3-

Transmit/receive data pair 3

6

TRP2-

Transmit/receive data pair 2

7

TRP4+

Transmit/receive data pair 4

8

TRP4-

Transmit/receive data pair 4