scope:

The standard specifies the usage of all protocols and supplementary services up to and including layer 4 for telematic terminals in the ISDN. The scope of this ETS is limited to demand circuit-switched calls using the 64 kbit/s unrestricted digital information bearer capability and the DTE/DTE case of the Network Layer peer entities in the B-channel connection. This ETS is based on other ETSs, International Standards or CCITT Recommendations and where necessary it adds new or other requirements as application rules.