Cisco 7962 IP Phone Factory Default Reset How to

Performing a Factory Reset

When you perform a factory reset of the Cisco Unified IP Phone, the following information is erased or reset to its default value:

•CTL file—Erased

•LSC—Erased

•User configuration settings—Reset to default values

•Network configuration settings—Reset to default values

•Call histories—Erased

•Locale information—Reset to default values

•Phone application—Erased (phone recovers by loading the term62.default.loads file or the term42.default.loads file, depending on the phone model)

Before you perform a factory reset, ensure that the following conditions are met:

•The phone must be on a DHCP-enabled network.

•A valid TFTP server must be set in DHCP option 150 or option 66 on the DHCP server.

•The term62.default.loads file or the term42.default.loads and the files specified in that file should be available on the TFTP server that is specified by the DHCP packet.

To perform a factory reset of a phone, perform the following steps:

Procedure

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Step 1 Unplug the power cable from the phone and then plug it back in.

The phone begins its power-up cycle.

Step 2 While the phone is powering up, and before the Speaker button flashes on and off,

press and hold #.

Continue to hold # until each line button flashes on and off in sequence in amber.

Step 3 Release # and press 123456789*0#.

You can press a key twice in a row, but if you press the keys out of sequence, the factory reset will not take place.

After you press these keys, the line buttons on the phone flash red, and the phone goes through the factory reset process.

Do not power down the phone until it completes the factory reset process, and the main screen appears.

Reference:

http://www.cisco.com/en/US/docs/voice_ip_comm/cuipph/7962g_7942g/7_0/english/administration/guide/7962trb.html#wp1031705

Powering up Cisco IP Phones

There are several options to power up cisco ip phones.

1. PoE switches - (Cisco Prestandards / 802.3af)
   
2. Power Patch Panel (Cisco Inline Power)
   
3. Power Injector (Power coupler, one per Powered Device)
   
4. Power Brick (AC to DC power conditioner)
   

PoE detection process

There are tow types of PoE.

1. Cisco PreStandard
2. 802.3af

One of the major difference between them is the detection process.
Detection process is used by PoE swtich to understand if the connected device need power provision.

1. Cisco PreStandard -
FLP (Fast Link Pause) sent from PoE switch, PoE device will loop it back to Switch.
In Cisco PreStandard PoE, CDP is used to negotiate the power level. Switch provide minimal power (6.3W) at first, then adjust to the value(up to 10W) derived from the power level negotiation.

2. 802.3af -
Small DC current constantly applied to line, PoE devices have resistor and will returned a specific level of resistence to the line. Non-PoE devices will not be harmed by this current.
The resistence level also determined which Power classes is needed by devices.



Reference:
CCNA Voice by Jeremy Cairo
http://en.wikipedia.org/wiki/Power_over_Ethernet
Troubleshooting Cisco PoE
Cisco Catalyst 4000 inline power solution