Signaling storage in digital channel banks

Details Signaling storage in digital channel banks Signaling storage in digital channel banks

1977-02-01

1977-11-22

Stewart, David L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

179 15BF, 3401461R, H04J 312

Patent

active

040597318

ABSTRACT:
In a digital channel bank, the binary signaling states (on-hook, off-hook) are updated periodically for each channel. Some number (n .gtoreq. 2) of the most recent of these samples are stored at the receive end of the digital system for each message channel. Under normal working conditions the output (to the switching machine) is directly influenced by the incoming real-time samples. However, when a carrier disturbance (i.e., out-of-frame condition) is detected, the updating process is stopped and the output is controlled by the older stored bits. That is, instead of sending the real-time signaling information of each channel to the switch, the signaling bits that were received and stored during a previous frame (e.g., 12 or more frames earlier) are now coupled to the switch. This assures a high probability that the proper signaling state is presented to the switch during short carrier disturbances.

REFERENCES:
patent: 3378641 (1968-04-01), Varsos
patent: 3386081 (1968-05-01), Varsos
patent: 3676210 (1972-10-01), Peterson
patent: 3970799 (1976-07-01), Colton
Bell Laboratories Record, Aug. 1972, "The D3 Channel Bank" by W. B. Gaunt et al., pp. 229-233.
Bell System Technical Journal, Oct. 1972, "D2 Channel Bank: Per-Channel Equipment" by C. L. Maddox et al., pp. 1659-1673.
Bell System Technical Journal, Oct. 1972, "D2 Channel Bank: System Aspects" by H. H. Henning et al., pp. 1641-1657.

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