AT&T 7200 series Wats Wide Area Telephone Service Trunk, Wink-Start Incoming, Wink-Start Outgoing

TRUNKING TERMS AND CAPABILITIES C-15

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Note: Previously, most switch implementations of the universal trunk type have not actually timed for a precise wink signal. However, they do provide dial-tone detection for subnet trunk groups.

With System 85 (R2V4) and Generic 2, E&M trunk types 41, 43, 46, and 47 will provide a ‘‘true’’ wink- start and ‘‘true’’ delay-dial signal. Trunk types providing the‘‘true’’ wink-start and ‘‘true’’ delay-dial signal provide improved operation. Recall that System 85 (R2V4) and Generic 2 provide the capability to administer a different signaling type from that implied by the trunk type. If for these trunk types (41, 43, 46, and 47) the signaling is administered to a type other than the default value, then universal signaling does not apply.

WATS (Wide Area Telephone Service) Trunk

A LEC or AT&T offering that provides bulk cal billing rather than individual call billing.

Wink-Start Incoming

The trunk signaling method that consists of a momentary ‘‘WINK’’ off-hook signal (on-hook to off-hook to on-hook). The off-hook part of the signal consists of operating the M-lead for a time duration ranging from 140 ms (minimum) to 290 ms (maximum). Electromechanical switches typically generate a 200 ms-wink while electronic switches typically generate a 150-ms wink. This ‘‘WINK’’ signal indicates, to the distant originating switch, that the local switch is ready to receive dialed digits. The signal is transmitted about 100 ms after receipt of the initial seizure.

Note: Some trunk types allow giving dial tone in addition to sending the wink-start signal.

Wink-Start Outgoing

The originating switch goes off-hook on the M lead to seize the trunk, then listens on the E-lead for a ground response. Upon detecting a ground on the E-lead (a successful wink-start signal), the local switch transmits the address digits. A ‘‘no response’’ on the E-lead indicates a signaling failure.