Siemens Aktiengesellschaft

Peter Strohmeier

Eduard Zwack

Juergen Heitmann

Friedrich Geissler

At least one connection for the communication exchange and one connection for the communication of frame clock signals is provided between centralized equipment, for example a switching matrix network, and decentralized equipment, for example line trunk groups. The frame clock signals indicate the beginning of a transmission frame utilized for the channel-oriented communication exchange. The operating condition information, for example equipment is 'active' or 'inactive' are communicated by pulse-duration or pulse-pause modulated or by n-coded pulse duration or pulse-pause-modulated frame clock signals.

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Munich, Germany

Peter Strohmeier