Abstract
The upgrading of already installed μP-controlled Cable Line Concentrators (CLC) in order to accept N-ISDN subscribers is presented. The CLC is inserted in the Digital Transmision System (DTS) part of the ISDN subscriber access in such a way that no changes on the ISDN equipment are required. The necessary modifications of the CLC are limited to the replacement of the subscriber line interface modules and to the adaptation of the central control unit software in order to recognize and invoke specific wake-up signals. The proposed upgrading has been applied to a recently developed CLC for ISDN subscriber lines using the DTS 2B1Q.
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