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No. 1 Electronic Switching System Arranged with Data Features

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The No. 1 Electronic Switching System Arranged with Data Features (No. 1 ESS ADF) was an adaptation of the No 1. Electronic Switching System to create a store and forward message switching system. It used both single and multi-station lines for transmitting teletypewriter and data messages. It was created to respond to a growing need for rapid and economical delivery of data and printed copy.[1]

Features

The No. 1 ESS ADF had a large number of features, including:[2]

  • Mnemonic addresses: Alphanumeric codes used to address stations
  • Group code addresses: Mnemonic codes used to address a specific combination of stations
  • Precedence: Message delivery according to four levels of precedence
  • Date and time services: Optional date and time of message origination and delivery
  • Multiline hunting groups: Distribution of messages to the next available station in a group
  • Alternate delivery: Optional routing of all messages addressed to one station to another station

References

  1. ^ No. 1 ESS ADF: System Organization and Objectives, Bell System Technical Journal, 49(10), 2733 (1970)
  2. ^ No. 1 ESS ADF: System Organization and Objectives, Bell System Technical Journal, 49(10), 2747-2751 (1970)

Category:Telephone exchange equipment Category:History of the telephone

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