STUTTER DIAL TONE DETECTION DEVICES
Terminal equipment that automatically goes off-hook for the purpose of checking for stutterdial tone does not comply with Clause 4.7.8 of TIA/EIA-IS-968. However, a stutter dial tone detection device shall be acceptable for connection to the telephone network provided it meets all other applicable requirements and all of the following specifications and conditions:
(i). the device performs no periodic testing for stutter dial tone;
(ii). the device makes an off-hook stutter dial tone check no more than once after asubscriber completes a call, and completes the check no earlier than 4 seconds after the subscriber hangs-up;
(iii). the device makes an off-hook stutter dial tone check after an unanswered call nomore than once;
(iv). the device performs no off-hook stutter dial tone check after an unansweredincoming call if the visual message indicator is already lit;
(v).the device takes the line off-hook for no more than 2.1 seconds per stutter dial tone check. Since the equipment cannot begin checking for stutter dial tone until dial tone is present, this 2.1 second interval begins when dial tone is applied to the line. If dial tone is not applied within 3 seconds, the equipment should abandon the stutter dial tone check;
(vi). the device synchronizes off-hook checks when multiple stutter dial tone detectionand visual signaling devices are attached to the same line so that only one check is made per calling event for a single line;
(vii). the device does not block dial tone to a subscriber attempting to initiate a call as anoff-hook stutter dial tone detection check is occurring; and,
(viii). the device does not use more than 8 micro-amps of direct current (DC) fromsubscriber line loop, except that the device may draw loop DC sufficient to make authorized off-hook checks.
ADSL modems do not comply with the signal power requirements of Clause 220.127.116.11 ofTIA/EIA-IS-968. However, an ADSL modem shall be acceptable for connection to the telephone network provided it meets all other applicable requirements and all of the following specifications and conditions:
(i). the modem meets the transmitter spectral response requirements specified inSection 7.14 of T1.413-1998, and
(ii). the modem operates with an aggregate power of less than 12.5 dBm over therange 25.875 to 138 kHz as specified in Section 7.15 of T1.413-1998.
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