1. Most of case, PL2303 driver is installed and apply to below command to verify it.


Linux_Mint # dmesg




[14392.366658] usb 1-1.2: new full speed USB device using ehci_hcd and address 6
[14393.143875] usbcore: registered new interface driver usbserial
[14393.143887] USB Serial support registered for generic
[14393.143918] usbcore: registered new interface driver usbserial_generic
[14393.143920] usbserial: USB Serial Driver core
[14393.158583] USB Serial support registered for pl2303
[14393.158609] pl2303 1-1.2:1.0: pl2303 converter detected
[14393.160953] usb 1-1.2: pl2303 converter now attached to ttyUSB0
[14393.161039] usbcore: registered new interface driver pl2303
[14393.161042] pl2303: Prolific PL2303 USB to serial adaptor driver
[14757.404020] pl2303: disagrees about version of symbol module_layout



2. choose "Serial" and put "/dev/ttyUSB0" on Serial line box.







Last Updated (Wednesday, 16 November 2011 07:07)


After fresh install of guest OSs (Ubuntu, Mint linux and etc....), window resolution set by maximum 800x600.

Here is how to change that.

1. "Install Guest Additions"

Click "Install Guest Additions" on top of menu under Device tap

how to change window resolution on virtualbox image 1


Last Updated (Wednesday, 16 November 2011 07:07)

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Here is the story about "How to configure LLDP (802.1ab) on Cisco switch for Nortel IP Phone". Well, some of them don't like this way due to opening LLDP (802.1ab) which is link layer protocol will bring security concerns. If you don't like this way check below articles.Picture of LG-Nortel IP Phone 1140e

"Nortel IP Phone/NTDU92 Setting for auto DHCP config with Option 191" and "How to setup DHCP Window server for LG/Nortel IP phones"


Background >

Phone : Nortel 1140e phones
Switch : Cisco Catalyst 3560 and etcSwitch
DHCP Server : Window Server 2008 R2

Data VLAN : 100
VoIP VLAN : 200



Last Updated (Tuesday, 10 November 2015 11:01)

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[ Phone Configuration ]

1. Getting setup mode.

When the Nortel IP phone is powered on, wait until "Nortel network" sign comes on the screen.picture of Nortel IP Phone model NTDU92
Once the sign is shown, immediately push top 4 buttons right below the LCD screen from left to right  to enter configuration mode.

2. Following below option to complete

EAP Enable? [0-N, 1-Y]: 0
LLDP Enable? [0-N, 1-Y]: 0
DHCP? [0-N, 1-Y]: 1
DHCP :0-FULL, 1-Partia: 0
Speed? [0-A, 1-10, 2-100]: 0
cfg XAS? [0-N, 1-Y]: 0
Voice 802.1Q? [0-N, 1-Y]: 1
Voice VLAn? [0-N, 1-Y]: 1
VLAN Cfg? [0-Auto, 1-Man]: 0
DHCP? [0-N, 1-Y]: 1
VLANFilter? [0-N, 1-Y]: 0
Ctrl pBits [0-7, 8-Au]: 8
Media pBits [0-7, 8-Au]: 8
PC Port? [0-OFF, 1-ON]: 1
Speed? [0-A, 1-10, 2-100]: 0
Data 802.1Q [0-N, 1-Y]: 0
PCUntagALL? [0-N, 1-Y]: 1
GARP Ignore? [0-N, 1-Y]: 0
PSK SRTP? [0-N, 1-Y]: 0


Last Updated (Tuesday, 10 November 2015 11:01)

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It took a while to figure out how to setup Nortel IP phone with window 2008 server DHCP auto Picture of LG-Nortel IP Phone 1140econfiguration and here is the sharing.

Once a Nortel IP phone is plugged (powered), it sends "DHCP Discover" broadcast which includes the hardcoded option 60, vendor class identifier, "Nortel-i2004-A" and requests from the DHCP server a list of parameters including option 43, 128 and 191.

The DHCP Server is configured with a vendor class " Nortel-i2004-A " with parameters option 43, 128, 144, 191 and etc.(the vendor class must match the option 60 that is coming from client phone.)

** Well, if your phone and switch(PoE) support LLDP(802.1ab), then it would be more simpler, but it will involved more security concerns. See article "Cisco LLDP installation guide for Nortel IP Phone".


[ Background ]

Phone : Nortel 1140e phones

Call Server : Nortel CS2100(Communication Server) - IP and

Switches : Cisco Catalyst 3560 and etc

DHCP Server : Window 2008 R2.

Provisioning Server :


Data VLAN : 100

VoIP VLAN : 200 ( extra 300, 400 )


Last Updated (Tuesday, 10 November 2015 11:01)

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How to add DHCP scope option on Window Server for Nortel IP phones

1. From DHCP server manager, highlight on name of DHCP server

Adding DHCP Scope Option on window server for Nortel IP phones 1



Last Updated (Tuesday, 10 November 2015 11:02)

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