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...the stack master or a standalone switch. The RPS is providing power to the switch (redundancy has been allocated to this device). Press the Standby/Active button on the Catalyst 3750G-12S-SD switch. Contact Cisco Systems. The internal power supply in a switch has failed, and the RPS is... selecting the stack master switch or a stack error. 1-16 Catalyst 3750 Switch Hardware Installation Guide OL-6336-10 Table 1-2 lists the LED colors and their meanings. For more information about the Cisco RPS 675, see the Cisco Redundant Power System 2300 Hardware Installation Guide. The Master LED...
...the stack master or a standalone switch. The RPS is providing power to the switch (redundancy has been allocated to this device). Press the Standby/Active button on the Catalyst 3750G-12S-SD switch. Contact Cisco Systems. The internal power supply in a switch has failed, and the RPS is... selecting the stack master switch or a stack error. 1-16 Catalyst 3750 Switch Hardware Installation Guide OL-6336-10 Table 1-2 lists the LED colors and their meanings. For more information about the Cisco RPS 675, see the Cisco Redundant Power System 2300 Hardware Installation Guide. The Master LED...
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... be used to connect Cisco pre-standard IP Phones and wireless access points or IEEE 802.3af-compliant devices to a fault. Blinking green Activity. Port is enabled by default. Error frames can affect connectivity, and errors such as STP checks the switch for possible loops. Off... Port is receiving power from the network. If the powered device is operating in full duplex. 1-18 Catalyst 3750 Switch Hardware Installation Guide OL-6336-10 Alternating...
... be used to connect Cisco pre-standard IP Phones and wireless access points or IEEE 802.3af-compliant devices to a fault. Blinking green Activity. Port is enabled by default. Error frames can affect connectivity, and errors such as STP checks the switch for possible loops. Off... Port is receiving power from the network. If the powered device is operating in full duplex. 1-18 Catalyst 3750 Switch Hardware Installation Guide OL-6336-10 Alternating...
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...have many packet errors, or the port constantly loses and regains link. It might connect at the physical layer but then cause packet corruption because of encoding, optical frequency, and fiber type. Contact your Cisco technical support representative if your switch does not pass ...• For fiber-optic connectors, verify that they use Category 3 copper cable for a description of tests that runs automatically to do this. Catalyst 3750 Switch Hardware Installation Guide 3-2 OL-6336-10 See the "LEDs" section on page 1-13 for 10 Mb/s unshielded twisted pair (UTP) connections. ...
...have many packet errors, or the port constantly loses and regains link. It might connect at the physical layer but then cause packet corruption because of encoding, optical frequency, and fiber type. Contact your Cisco technical support representative if your switch does not pass ...• For fiber-optic connectors, verify that they use Category 3 copper cable for a description of tests that runs automatically to do this. Catalyst 3750 Switch Hardware Installation Guide 3-2 OL-6336-10 See the "LEDs" section on page 1-13 for 10 Mb/s unshielded twisted pair (UTP) connections. ...
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...error-disabled, disabled, or shutdown status. Re-enable the port if necessary. • Verify that the power supply installed in the switch meets the power requirements of the cable are connected to the correct ports. • Verify that you should: • Use the Mode button to a PoE port. OL-6336-10 Catalyst 3750 Switch.... If the link light for the port does not come on page 1-17 for all ports. Many legacy powered devices, including older Cisco IP phones and access points that do not fully support IEEE 802.3af, might have power. • Verify that both sides have link...
...error-disabled, disabled, or shutdown status. Re-enable the port if necessary. • Verify that the power supply installed in the switch meets the power requirements of the cable are connected to the correct ports. • Verify that you should: • Use the Mode button to a PoE port. OL-6336-10 Catalyst 3750 Switch.... If the link light for the port does not come on page 1-17 for all ports. Many legacy powered devices, including older Cisco IP phones and access points that do not fully support IEEE 802.3af, might have power. • Verify that both sides have link...
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... of the connection. For information about enabling UDLD on fiber-optic connections. Use the show interfaces privileged EXEC command to check the port or module error-disabled, disabled, or shutdown status. Ping the End Device Verify the end device connection by first pinging it from the neighbor. Spanning Tree Loops Spanning... an aggressive mode. If necessary, re-enable the port or the interface. In aggressive mode, UDLD also detects unidirectional links caused by one -way communication. Catalyst 3750 Switch Hardware Installation Guide 3-4 OL-6336-10
... of the connection. For information about enabling UDLD on fiber-optic connections. Use the show interfaces privileged EXEC command to check the port or module error-disabled, disabled, or shutdown status. Ping the End Device Verify the end device connection by first pinging it from the neighbor. Spanning Tree Loops Spanning... an aggressive mode. If necessary, re-enable the port or the interface. In aggressive mode, UDLD also detects unidirectional links caused by one -way communication. Catalyst 3750 Switch Hardware Installation Guide 3-4 OL-6336-10
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...to autonegotiate, yet sometimes autonegotation issues occur. OL-6336-10 Catalyst 3750 Switch Hardware Installation Guide 3-5 Cabling Distance If the port statistics show a large number of alignment errors, frame check sequence (FCS), or late-collisions errors, a speed or duplex mismatch might be causing the problem... to manually set both ends of these guidelines when you troubleshoot switch performance problems. Speed, Duplex, and Autonegotiation If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance from the manually set speed or...
...to autonegotiate, yet sometimes autonegotation issues occur. OL-6336-10 Catalyst 3750 Switch Hardware Installation Guide 3-5 Cabling Distance If the port statistics show a large number of alignment errors, frame check sequence (FCS), or late-collisions errors, a speed or duplex mismatch might be causing the problem... to manually set both ends of these guidelines when you troubleshoot switch performance problems. Speed, Duplex, and Autonegotiation If the port statistics show excessive FCS, late-collision, or alignment errors, verify that the cable distance from the manually set speed or...
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...km)1 - - The mode-conditioning patch cord is required. Modal bandwidth applies only to 100 km)4 62 miles (100 km) 1. H5579 Catalyst 3750 Switch Hardware Installation Guide B-6 OL-6336-10 the distance depends on both the sending and receiving ends of two twisted-pair cables for link distances... module with MMF, 1000BASE-LX/LH SFP modules, and a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (BER). Cable Distance 43.4 to 62 miles (70 to multimode fiber. 2. Using an ordinary patch cord with 62.5-micron diameter...
...km)1 - - The mode-conditioning patch cord is required. Modal bandwidth applies only to 100 km)4 62 miles (100 km) 1. H5579 Catalyst 3750 Switch Hardware Installation Guide B-6 OL-6336-10 the distance depends on both the sending and receiving ends of two twisted-pair cables for link distances... module with MMF, 1000BASE-LX/LH SFP modules, and a short link distance can cause transceiver saturation, resulting in an elevated bit error rate (BER). Cable Distance 43.4 to 62 miles (70 to multimode fiber. 2. Using an ordinary patch cord with 62.5-micron diameter...