UnicodeDecodeError: 'utf8' codec can't decode byte 0xd6 in position 223

UnicodeDecodeError: 'utf8' codec can't decode byte 0xd6 in position 223RF 2.7.6 & Telnet
*** Settings ***
Variables         telnet_variables.py
Library           Telnet

*** Test Cases ***
ATesting
    open connection    ${HOST}    port=${PORT}
    login    ${USERNAME}    ${PASSWORD}

Starting test: Telnet.Test Login.ATesting
20130218 16:15:32.425 : INFO : Opening connection to 10.194.129.207:2080 with prompt: None
20130218 16:15:33.559 : FAIL : UnicodeDecodeError: 'utf8' codec can't decode byte 0xd6 in position 223: invalid continuation byte
Ending test:   Telnet.Test Login.ATesting

http://en.wikipedia.org/wiki/CJK
CJK character encodings should consist minimally of Han characters plus language-specific phonetic scripts such as pinyin, bopomofo, hiragana, katakana and hangul.

CJK character encodings include:

    Big5
    EUC-JP
    EUC-KR
    GB18030 (mandated standard in the People's Republic of China)
    GB2312 (subset and predecessor of GB18030)
    ISO 2022-JP
    KS C 5861
    Shift-JIS
    Unicode encodings

*** Settings ***
Library           Telnet
*** Test Cases ***
Open Connection
    ${index} =    Open Connection    10.194.129.207    port=2080    prompt=$    encoding=GB18030 # encoding=GB2312 can work base win7 64bit Chinese/ server redflag
    Should Be Equal    ${index}    ${1}
    Log    ${1}
    Login    gxhterm    gxhterm