![]() Large systems (51C/61C/81C) use a DB-9 (E1), or DB-15 (T1) connector, located at the rear of a network shelf. If the circuit doesn't go green, swap the TX/RX pairs: If neither are available, make the termination directly on the MDF block associated with the card slot using the following pinout. The NTBK65 is a replacement to the NTBK04 cable assembly. ![]() The following table shows the NTBK65 adaptor signal pin out: Be prepared to swap these, to switch the TX / RX pairs. An RJ-45 connector will fit an RJ-48 jack, but the key on an RJ-48 connector will prevent it from plugging into an RJ-45 jack.Ī standard RJ-45 ethernet cable (568B) works, but note the active pairs are orange and blue, not orange/green. If the circuit doesn't go green, just swap the TX/RX pairs. If you can't find an NTBK65 UDT RJ48C breakout adaptor (right), use pairs 23 (TX) and 24 (RX) on the MDF. Media Gateways (and Option 11's) can use an NTBK04 cable, NTBK65 adapter, or a direct MDF connection. A single direct CAT5/6 cable is always preferred. Ethernet accessories (eg, patch panels) may either not work or cause problems. Note: When using RJ-45's, remember it isn't ethernet! The active pairs in a T1/E1 network are pins 1 & 2 and pins 4 & 5, not 1 & 2 and 3 & 6. * CSU/DSU = Channel Service Unit/Data Service Unit, eg, the PTT modem. The following table shows the pinouts for each: A Yellow "Far End Alarm" (FEA) indicates the local TX pair is open (a yellow alarm is "received").Ī circuit can be presented on a DB-9 (E1), DB-15 (T1), or RJ48/RJ45.A Red "Near End Alarm" (NEA) indicates a local cabling problem, with the RX (or both) pairs open. ![]() It can use a number of different connection methods depending upon the service, provider, equipment, and location:Ī TX pair will generally connect to a RX pair, but be prepared to experiment a little (and/or swap/crossover the pairs). For Linux, BurnInTest for Linux v1.0 or above is required.Īs there are several ways to build loopback plugs, we can not guarantee the compatibility of our plugs with any software except BurnInTest Professional.A 2 pair connection (TX/RX) between the service providers CSU/DSU (Channel Service Unit/Data Service Unit) and the customers PBX. In order to use the plugs with Windows, BurnInTest Professional v2.0 or above is required. Window 98, ME, 2000, 2003, XP (32-bit and 64-bit), Vista (32-bit and 64-bit), 2008 Server (32-bit and 64-bit), Windows 7 (32-bit and 64-bit), Windows 8 (32-bit and 64-bit), Windows 10 (64-bit) and Linux platforms are supported, provided you have the correct version of BurnInTest. If a cable is used, then it should be a straight through cable. No cabling is required as these plugs are designed to connect directly to the back of a PC. The red lines and gray dots show the connections that need to be made. It's the rear view of the male DB-25 connector that's required for the plug. This diagram shows the connections that need to be made. We believe that this plug will work with all styles of parallel ports. However, over time several changes have taken place to the electrical interface with the introduction of enhanced and bi-directional parallel ports. ![]() The parallel port on IBM compatible PC's have always used a DB-25 connector. Specifications for Parallel Loopback plug It's the rear view of the female DB-9 connector that's required for the plug. This diagram shows the pinout connections that need to be made.
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