There is a third bank of DIP switches located inside the Hx chassis used to set country-specific voltage and line impedance settings and to set the Call Progress Tone to be detected if Call Progress Tone Disconnect is used.
The Factory Default setting is all 8 bits set to the OFF position (labeled OPEN on the switch). This default configuration is set for operation within the United States and Canada (North American telephone line characteristics, and the ‘precise’ dial-tone signal for Call Progress Tone Disconnect).
You must remove the top cover of the chassis to gain access to the third bank of DIP switches located on the Hx motherboard.
Important! The chassis cover should only be removed by a qualified technician. AC power must be disconnected prior to removing the cover.
The internal DIP switch bank is divided up into two subsets of 4 switches each:
Bits 1 through 4 configure the Hx’s telephone interface circuitry to match the telephone line impedance and voltage characteristics of the country where the hybrid is used.
Bits 5 through 8 configure Call Progress Tone Detection to match the call progress tones used by various countries or central office switches.
Call progress tones (Dial tone, busy tone, etc) can be used to make the Hx disconnect when loop current signaling is not available or is unreliable.
Call Progress Tone Disconnect is active only on Auto-Answered incoming calls to prevent undesired disconnections; it may be disabled if the feature causes problems in your application; see internal DIP switch settings table below.
Table 1 below provides details of network characteristics. Table 2 deals with Call Progress Tone Detection. Table 3 lists the recommended DIP settings for each country.
Note that the term "re-order tone" refers to the "fast busy" signal often used to indicate network congestion or an error condition.
TABLE 1 - Network Characteristics (Bits 1 - 4)
TABLE 2 - Call Progress Tone Detection Settings (Bits 5 - 8)
TABLE 3 - Settings for Countries (Bits 1 - 8)
Bit 1
Bit 2
Bit 3
Bit 4
Telephone Network
OFF
OFF
OFF
OFF
USA, Canada
OFF
OFF
OFF
ON
Japan, low voltage networks
OFF
OFF
ON
OFF
FCC-compliant countries
OFF
OFF
ON
ON
CRT21, Europe (real line impedance)
OFF
ON
OFF
OFF
Custom country configuration
OFF
ON
OFF
ON
Custom country configuration
OFF
ON
ON
OFF
Custom country configuration
OFF
ON
ON
ON
Europe (complex line impedance)
ON
OFF
OFF
OFF
Custom country configuration
ON
OFF
OFF
ON
Custom country configuration
ON
OFF
ON
OFF
Custom country configuration
ON
OFF
ON
ON
Reserved for future use
ON
ON
OFF
OFF
Reserved
ON
ON
OFF
ON
Reserved
ON
ON
ON
OFF
Reserved
ON
ON
ON
ON
Reserved
Bit 5
Bit 6
Bit 7
Bit 8
CPTD Characteristics
OFF
OFF
OFF
OFF
U.S. dial tone
OFF
OFF
OFF
ON
U.S. re-order signal
OFF
OFF
ON
OFF
WORLD single-frequency dial tone
OFF
OFF
ON
ON
WORLD re-order, ON = 155 - 550ms,
OFF = 155-550ms
OFF
ON
OFF
OFF
WORLD re-order, ON = 250 - 1,200ms,
OFF = 250 - 1,200 ms
OFF
ON
OFF
ON
WORLD, multi-tone dial tone
OFF
ON
ON
OFF
WORLD, multi-tone dial tone
OFF
ON
ON
ON
WORLD, pulse dial tone, ON = 150 - 350ms,
OFF = 450 = 1,100ms
ON
OFF
OFF
OFF
WORLD, pulse dial tone, ON = 100 = 250ms,
OFF = 200 - 400ms
ON
OFF
OFF
ON
Reserved for future use
ON
OFF
ON
OFF
Reserved
ON
OFF
ON
ON
Reserved
ON
ON
OFF
OFF
Reserved
ON
ON
OFF
ON
Reserved
ON
ON
ON
OFF
Reserved
ON
ON
ON
ON
CPTD feature disabled
Country
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Argentina
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Australia
ON
OFF
OFF
ON
OFF
OFF
ON
ON
Austria
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Bahrain
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Belgium
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Brazil
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Bulgaria
OFF
ON
ON
ON
OFF
ON
ON
ON
Canada
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Chile
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
China
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Columbia
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Croatia
OFF
ON
ON
ON
OFF
ON
ON
ON
CTR21
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Cyprus
OFF
ON
ON
ON
OFF
ON
OFF
ON
Czech Republic
OFF
ON
ON
ON
OFF
OFF
ON
OFF
Denmark
OFF
OFF
ON
ON
OFF
OFF
ON
ON
Ecuador
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Egypt
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
El Salvador
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Finland
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
France
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
Germany
OFF
OFF
ON
ON
OFF
OFF
ON
ON
Greece
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Guam
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Hong Kong
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Hungary
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
Iceland
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
India
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Indonesia
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Ireland
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Israel
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Italy
OFF
OFF
ON
ON
OFF
OFF
ON
ON
Japan
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
Jordan
OFF
OFF
OFF
ON
OFF
OF
ON
OFF
Kazakhstan
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Kuwait
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Latvia
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Lebanon
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Luxembourg
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Macao
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Malaysia
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Malta
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Mexico
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Morocco
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Netherlands
OFF
OFF
ON
ON
OFF
OFF
ON
ON
New Zealand
OFF
ON
ON
OFF
OFF
OFF
ON
OFF
Nigeria
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
North Korea
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Norway
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Oman
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Pakistan
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Peru
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Philippines
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Poland
ON
OFF
OFF
OFF
OFF
OFF
ON
OFF
Portugal
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Romania
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Russia
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Saudi Arabia
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Singapore
OFF
OFF
ON
OFF
OFF
OFF
ON
ON
Slovakia
OFF
OFF
ON
OFF
OFF
ON
ON
ON
Slovenia
ON
OFF
OFF
OFF
OFF
ON
ON
ON
South Africa
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
South Korea
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
Spain
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Sweden
OFF
OFF
ON
ON
OFF
ON
OFF
OFF
Switzerland
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
Syria
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Taiwan
OFF
OFF
OFF
ON
ON
OFF
OFF
OFF
Thailand
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
Turkey
OFF
OFF
ON
ON
OFF
OFF
ON
OFF
UAE
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
United Kingdom
OFF
OFF
ON
ON
OFF
ON
OFF
ON
USA
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
Yemen
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF