单选题
发布日期:2020-04-10
Electronic Service Agent software provides a redundant heartbeat between sites.
A non-IP network and Dial Back Fail Safe provide redundant heartbeats between sites.
The GeoMirror Devices provide a link validation facility that guarantees the validity between sites.
The Site Notification Daemon maintains a heartbeat between sites via short haul Modems/line drivers and dark fibre.
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