Interphase Tech ispan 5535 pri Manual Do Utilizador

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A bit errors detection technique 

that employs an algorithm to calculate a value for the information bits 

in a packet. The receiver, using the same algorithm, recalculates that 

value and compares it to the value received. If the two values do not 
agree, the transmitted packet is considered to be in error.

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A CS is the replication or deletion of the pay-

load bits of the DS1 frame. A Controlled Slip may be performed when 
there is a difference between the timing of a synchronous receiving ter-
minal and the received signal. 

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A dial-up data communications chan-

nel which, once established, looks like a transparent data pipe. Also, 
the type of ISDN service required to utilize this capability of an ISDN 
circuit. Contrast with CSV. 

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A device 

which incorporates the functions of a CSU and a DSU and interfaces 
between a Switched-56 (or Dedicated Digital Service) line and a user’s 
data equipment.

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A dial-up communications circuit for 

voice grade communication. Also, the type of ISDN service required 
to use this capability of an ISDN circuit. Contrast with CSD. 

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One of the three standard channels on a BRI line. At 16 

Kbps, a D channel carries all signaling information and can carry low-
speed packet data such as X.25 packet switching. 

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The point on a customer’s premises 

where the line from the telephone company meets the customer’s wir-
ing at the customer’s premises.

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Your seven digit telephone number (without the 

area code), as found in the telephone directory. Each BRI connection 
can have up to two directory numbers, one for each B channel.

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A fast method of moving data 

between two subsystems without processor intervention.

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The name of a central office switch manufactured by 

Northern Telecom. These switches use Custom (proprietary) or 
National ISDN-1 (NI-1) software.

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See CSU/DSU. 

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ETSI is the European Telecommunications Standards Insti-

tute.