Browse Prior Art Database

Attachment of Loop Terminals to a Time Division Switch

IP.com Disclosure Number: IPCOM000048363D
Original Publication Date: 1982-Jan-01
Included in the Prior Art Database: 2005-Feb-08
Document File: 2 page(s) / 64K

Publishing Venue

IBM

Related People

Borgnis, P: AUTHOR [+3]

Abstract

This article describes a sub-group adapter which permits the attachment of loop terminals to a time-division switch.

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Attachment of Loop Terminals to a Time Division Switch

This article describes a sub-group adapter which permits the attachment of loop terminals to a time-division switch.

Fig. 1 illustrates the data flow circulating from one terminal connected to data sub-group i to a terminal connected to data sub-group j. Data are extracted from, for example, time slot 4 on the incoming PCM link and transmitted to the first terminal (A) in sub-group i by Control through Local Switch. Terminal A analyzes and transmits the data with or without modification to the next terminal within sub-group i, and so on. The Control monitors the data transmitted by the last terminal (B) and sends them in time slot 4 on the outgoing PCM link. The time- division switch switches time slot 4 on the outgoing PCM link into, for example, time slot 5 to be sent to data subgroup j. Sync is used to synchronize the data rate on the PCM links to the terminal data rates.

Fig. 2 is the block diagram of a local switch. When the terminal is not connected, or power is off, switches SW1, SW4 are set as shown in the figure. The terminal is bypassed, and its output is wrapped back to its input. When a Terminal Ready condition is detected by control line C1, switches SW1 and SW2 are closed and opened, respectively, and the terminal monitors the Data In line through the high impedance input amplifier. When the terminal detects silence in the data stream, it activates control line C2 which causes switches SW3 and S...