Integrated Digital Loop Carrier - IDLC

IDLC systems are the integration of the integrated digital terminal (IDT) and remote digital terminal (RDT). The IDT is part of the local digital switch (LDS) and it acts like a concentrator to put more channels on a digital communications line. The IDLC system moves some of the switching services from the local switches into RDTs to increase the efficiency of communication lines between customers and the central office.

This diagram shows how an integrated digital loop carrier (IDLC) system can be installed in a local telephone distribution network to allow a 24 channel T1 line to provide service up to 96 telephone lines. This diagram shows that a switching system has been upgraded to include an IDT and a remote digital terminal (RDT) has been located close to a residential neighborhood. The IDT dynamically connects access lines (actually digital time slots) in the switching system to time slots on the communications line between the IDT and RDT. The RDT is a local switch that can connect up to 96 residential telephone lines. When a call is to be originated, the RDT connects (locally switches) the residential line to one of the available channels on the DS1 interconnection line. The IDT communicates with the RDT using the GR-303 standard.

Interconnection Types
Switching

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