loop back

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loop back

(1) To send outgoing signals back to the receiving side for testing purposes. See loopback address and loopback plug.

(2) To go back to the beginning of a subroutine in a program. See loop and infinite loop.
References in periodicals archive ?
The integrated unit also eliminates crosstalk between the loopback channel and the microphone cable and its associated measurement errors.
Designed for testing electrical signals in high-speed networks and systems, the High Speed Serial Data Connection 2 (HSSDC2) loopback is a small copper-based test fixture, featuring an HSSDC2 interface, a rugged metal housing and a quick-release lever.
Puma devices offer an extensive feature set including an integrated limiting amplifier with 10mV sensitivity, extended diagnostic and control signaling capabilities, and a flexible interface including multiple loopback modes and internal test pattern generation.
A scaled loopback option is also available, in which the operator can recalibrate the machine's control ratio by placing a preformed blank onto the scales.
GSM loopback BER base station tests are made possible using an HP VSA series transmitter tester in conjunction with an HP ESG generator.
In an attempt to reduce network installation and administration costs, Bell Laboratories, the research and development arm of Lucent Technologies in Murray Hill, N.J., is investigating a loopback system that would replace the laser sources at a customer's premises with an optical modulator.
Diagnostic capability includes switches for analog or digital loopback and remote test.
If you want to do a serious check on your LPT and COM ports, you will also need a set of special loopback plugs, but this test is usually not necessary as the computer either talks to the printers and modem or it doesn't.
* Prices: Check It, $149.95; PC Test, $49.95; Mini-Spiral floppy alignment disk, $69.95 or $99.95 for both 3.5" and 5.25"; three-piece serial and parallel port loopback plug kit, $29.95; and Basic PC Maintenance Hands-On video, $29.95.
- pairs of ear tags 2 conventional pendants for the first identification (n98), conventional pins for loopback (r1 and r2), and associated fitting material.
Perle's advanced features such as Link Pass-Through, Interlink Fault Feedback, and Loopback allow network administrators to "see everything" for more efficient troubleshooting and less on-site maintenance.
The U8903B audio analyzer also offers local loopback capability to provide fast and accurate testing of Bluetooth chipsets, modules, and devices.