Ringaround

1. The improper routing of a call back through a switching center already engaged in attempting to complete the same call.
2. In secondary surveillance radar, the presence of false targets declared as a result of transponder interrogation by side lobes of the interrogating antenna.

References

• Federal Standard 1037C

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reflection coefficient reflection loss reflective array antenna reflectivity refracted ray refractive index contrast reframing time regeneration relative transmission level release time reliability	remote access remote call forwarding remote operations service element protocol repeater repeating coil reproduction speed reradiation resolution resonance response response time	responsivity restoration return loss rf power margin ringback signal ringdown ringer equivalency number ring latency round trip delay time routing indicator rubidium standard	rural radio service saturation scan schematic scrambler screen secondary frequency standard second dialtone security security kernel security management