Cisco Catalyst 3750 User Manual

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Catalyst 3750 Switch Command Reference
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Chapter 2 Catalyst 3750 Switch Cisco IOS Commands
show cable-diagnostics tdr
This is an example of output from the show cable-diagnostics tdr interface interface-id command on
a Catalyst 3750G-24PS or 3750G-48PS switch:
Switch# show cable-diagnostics tdr interface gigabitethernet1/0/2
TDR test last run on: March 01 20:15:40
Interface Speed Local pair Pair length Remote pair Pair status
--------- ----- ---------- ------------------ ----------- --------------------
Gi1/0/2 auto Pair A 0 +/- 4 meters N/A Open
Pair B 0 +/- 4 meters N/A Open
Pair C 0 +/- 4 meters N/A Open
Pair D 0 +/- 4 meters N/A Open
Table 2-22 lists the descriptions of the fields in the show cable-diagnostics tdr command output.
This is an example of output from the show interfaces interface-id command when TDR is running:
Switch# show interfaces gigabitethernet1/0/2
gigabitethernet1/0/2 is up, line protocol is up (connected: TDR in Progress)
This is an example of output from the show cable-diagnostics tdr interface interface-id command when
TDR is not running:
Switch# show cable-diagnostics tdr interface gigabitethernet1/0/2
% TDR test was never issued on Gi1/0/2
Ta b l e 2-22 Fields Descriptions for the show cable-diagnostics tdr Command Output
Field Description
Interface Interface on which TDR was run.
Speed Speed of connection.
Local pair Name of the pair of wires that TDR is testing on the local interface.
Pair length Location on the cable where the problem is, with respect to your switch. TDR can only
find the location in one of these cases:
• The cable is properly connected, the link is up, and the interface speed is
1000
Mb/s.
• The cable is open.
• The cable has a short.
Remote pair Name of the pair of wires to which the local pair is connected. TDR can learn about
the remote pair only when the cable is properly connected and the link is up.
Pair status The status of the pair of wires on which TDR is running:
• Normal—The pair of wires is properly connected.
• Not completed—The test is running and is not completed.
• Not supported—The interface does not support TDR.
• Open—The pair of wires is open.
• Shorted—The pair of wires is shorted.
• ImpedanceMis—The impedance is mismatched.
• Short/Impedance Mismatched—The impedance mismatched or the cable is short.
• InProgress—The diagnostic test is in progress

Cisco Catalyst 3750 Specifications

General

Device Type	Switch
Switching Capacity	32 Gbps
Forwarding Rate	38.7 Mpps
Stacking Bandwidth	32 Gbps
RAM	128 MB
Jumbo Frame Support	Yes
Switch Type	Managed
Model	Catalyst 3750 Series
Uplink Interfaces	SFP
Form Factor	Rack-mountable
MAC Address Table Size	12, 000 entries
Routing Protocol	RIP, OSPF, EIGRP
Remote Management Protocol	SNMP, Telnet, HTTP
Features	Layer 3 switching, Layer 2 switching, auto-negotiation, BOOTP support, ARP support, VLAN support, auto-uplink (auto MDI/MDI-X), IGMP snooping, traffic shaping, MAC address filtering, Quality of Service (QoS), Jumbo Frames support, MLD snooping, Dynamic ARP Inspection (DAI), Cisco EnergyWise technology
Power over Ethernet (PoE)	PoE
Operating Temperature	-5 - 45 °C
Operating Humidity	10% to 85% non-condensing