Juniper EX3300 Hardware Guide

request diagnostics tdr
Syntax request diagnostics tdr (abort | start) interface interface-name
Release Information Command introduced in Junos OS Release 9.0 for EX Series switches.
Description Start a time domain reflectometry (TDR) diagnostic test on the specified interface. This
test characterizes and locates faults on twisted-pair Ethernet cables. For example, it can
detect a broken twisted pair and provide the approximate distance to the break. It can
also detect polarity swaps, pair swaps, and excessive skew.
The TDR test is supported on the following switches and interfaces:
• EX2200, EX3200, EX3300, and EX4200 switches—RJ-45 network interfaces. The TDR
test is not supported on management interfaces and SFP interfaces.
• EX6200 and EX8200 switches—RJ-45 interfaces on line cards.
NOTE: We recommend running the TDR test when there is no traffic on the
interface under test.
You view the results of the TDR test with the show diagnostics tdr command.
Options abort—Stop the TDR test currently in progress on the specified interface. No results are
reported, and previous results, if any, are cleared.
interface-name—The name of the interface.
start—Start a TDR test on the specified interface.
Required Privilege
Level
maintenance
Related
Documentation
show diagnostics tdr on page 254•
• Diagnosing a Faulty Twisted-Pair Cable (CLI Procedure) on page 332
List of Sample Output request diagnostics tdr start interface ge-0/0/19 on page 253
Output Fields Table 44 on page 253 lists the output fields for the request diagnostics tdr command.
Output fields are listed in the approximate order in which they appear.
Copyright © 2015, Juniper Networks, Inc.252
Network Interfaces for EX4300 Switches

Juniper EX3300 Specifications

General

Ethernet LAN	Yes
Authentication method	RADIUS, TACACS+
Connectivity technology	Wired
Ethernet interface type	Gigabit Ethernet
Number of VLANs	4096
Networking standards	IEEE 802.1ab, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3x, IEEE 802.3z
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Copper ethernet cabling technology	1000BASE-T, 100BASE-TX, 10BASE-T
Console port	-
ExpressCard slot	No
Fiber ports quantity	4
USB 2.0 ports quantity	0
Basic switching RJ-45 Ethernet ports quantity	48
Throughput	130 Mpps
Number of queues	8
MAC address table	16000 entries
Maximum data transfer rate	176 Gbit/s
Supported data transfer rates	10, 100, 1000Mbps
Switch type	Managed
Switch layer	L2
Security algorithms	SSH-2
Power source	AC
AC input voltage	100 - 240 V
Power consumption (typical)	100 W
Form factor	1U
Product color	Black
Flash memory	1024 MB
Processor frequency	1000 MHz
Compatible operating systems	Junos
Operating altitude	0 - 3049 m
Non-operating altitude	0 - 4877 m
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 45 °C
Storage relative humidity (H-H)	0 - 95 %
Operating relative humidity (H-H)	10 - 85 %
Supported network protocols	IPv6

Weight and Dimensions

Depth	310 mm
Width	437 mm
Height	44 mm
Weight	4900 g