Abstract: An improved craft technician's field terminal of the portable, hand-held type for use in communicating in diverse modes with a central technician access network. The terminal is connected to the telephone line in conventional manner in communication with the telephone access network. Job data can then be transmitted from the central network and downloaded to the terminal for instantaneous display. Re-transmission can be requested if needed. The terminal is capable of uploading data from the terminal display in either DTMF and/or ASCII to the central network. The craft technician's terminal contains a much greater storage capacity than any similar devices heretofore and it is capable of holding job order and response data for what amounts to greater than a full days technician work. In addition, data displayed at the terminal may readily be transmitted for printer access while still being retained in the terminal storage.

Abstract: First and second indicating circuits connect a source of ternary pulses to a load. The ternary pulses are subject to baseline overshoot above a threshold level for a given period of time after the termination of each pulse. The first indicating circuit transmits an indication to the load responsive to ternary pulses of positive polarity above the threshold level. The second indicating circuit transmits an indication to the load responsive to ternary pulses of negative polarity above the threshold level. Transmission of an indication to the load by the second indicating circuit is inhibited for the given period of time after the termination of a ternary pulse of positive polarity above the threshold level to suppress negative baseline overshoot. Transmission of an indication to the load by the first indicating circuit is inhibited for the given period of time after the termination of a pulse of negative polarity above the threshold level to suppress positive baseline overshoot.