Concepts and Principles of Operation
Directory numbers
A directory number is the address or telephone number for the ISDN line assigned by your ISDN service provider or telephone company. The number of directory numbers allocated depends on which Service Provider you are using. If you are using an
Service Profile Identifiers (SPIDs)
Note: Service Profile Identifiers are only allocated by Service Providers in North America.
When you order an ISDN service, your Service Provider needs to know which ISDN features you require, for example, Calling Line Identification (Caller ID). This is known as a service profile. Your service provider then allocates you a unique Service Profile Identifier (SPID) that allows you to use these particular features.
Depending on your ISDN variant, you will have none, one or two SPIDs assigned to your ISDN line as shown below.
ISDN Variant | Directory numbers | SPIDs | ||
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AT&T 5ESS | 1 | (1 per device) | None | |
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AT&T 5ESS | 2 | (1 per | 2 | (1 per |
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NTI DMS | 2 | (1 per | 2 | (1 per |
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2 | (1 per | 2 | (1 per | |
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1 | (1 per device) | 1 | (1 per device) | |
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European | 1 | (1 per device) | None | |
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1TR6 | 1 | (1 per device) | None | |
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NTT | 1 | (1 per device) | None | |
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Austel (TS013) | 1 | (1 per device) | None | |
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AT&T Point to Point ignores the Directory number from the user equipment, so you could be sending anything that will sync up, and it will place a call. One should leave the SPIDs blank while configure the Hypertec ISDN 10T Router for AT&T Point to Point Switch. ATT
56K/64K Rate Adaption
The Rate Adaptation of the line is the speed at which data can be transmitted over that line. This can be 64 KBPS or 56kbit/s. If you are connected to a European ISDN Service, always set the Rate Adaptation to 64 KBPS (the default value). If you are connected to a North American ISDN Service, always select 64 KBPS for local calls. You may need to select 56 KBPS for international or some
ISDN Permanent (Nailed) Circuit
Most telephone companies offer only switched ISDN circuits. In. Germany leased line ISDN service is also offered as a option. German ISDN Permanent connection services (types 64S, S01 and S02) is available from Deutsche Telekom. This service provides a permanently open leased line with an ISDN interface at each end, which allows you to take advantage of Deutsche Telekom tariff rates.
Service type | Number of channels |
64S | One |
S01 | One B- and one |
S02 | Two B- and one |
Japan NTT also offers leased line ISDN service :
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