In a word, it is a connection device that is plugged into a port to perform a loopback test. It provides system test engineers a simple but effective way of testing the transmission capability and receiver sensitivity of network equipment. The lookback cables can provide a simple and effective means of testing the capabilities of the network equipment, and they are typically used for fiber optic testing applications or network restorations.Ī loopback cable is also known as loopback plug or loopback adapter, which is a plug used to test physical ports to identify network issue. Do you know the loopback cable can be acted as a test tool in the telecommunication? Absolutely, the loopback signal is used for diagnosing the networking problem. The front panel CL – FL switch selects a loopback test mode:įor normal operation, the CL – FL switch must be in the center position.For testing applications, there are many tools for this function, such as visual faults locator, optical power meter, OTDR, etc. Category 3 or better shielded twisted-pair (STP) or unshielded twisted-pair (UTP) can be used. Use only dedicated wire pairs (such as blue/white & white/blue, orange/white & white/orange) for the active pins. The two RJ-45 active pairs in a T1/E1 network are pins 1 & 2 and pins 4 & 5. Refer to the user-guide ( NID) to set the DIP switches (T1 or E1 mode) as required. If a circuit is presented on coaxial connectors, always use a balun with a matching impedance, eg: 75 to 120 ohm.ĭS1 - T1/E1 converters must be used in pairs, one on each end of the fiber link. The RJ45 side uses the standard pairs: 1 & 2, and 4 & 5. A G.703 Balun is a bi-directional passive device (transformer) that converts unbalanced (75 ohm, BNC) to balanced (120 ohm, RJ45) signals. RJ48 connector will prevent it from plugging into an RJ45 jack.Īn E1 maybe presented on two coaxial connectors (eg, BNC's), one each for TX and RX. Note: An RJ45 connector will fit an RJ48 jack, but the key on an
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