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  • Pdf Drawing... 
  • GigaStation2 Snap Fitting, BNC, Female/Female, Office White PDF Drawing
    PDF Drawing for FMT332-R2 (Version 1)
 
  • Pdf Drawing... 
  • Black GigaBase2 CAT5e Jack with Universal Wiring
    Drawing for the FMT921-R2 and FMT921-R2-25PAK.
 

Black Box Explains...Fiber optic attenuators.

Attenuators are used with single-mode fiber optic devices and cable to filter the strength of the fiber optic signal. Depending on the type of attenuator attached to the devices at... more/see it noweach end of the fiber optic cable, you can diminish the strength of the light signal a variable amount, measured in decibels (dB).

Why would you want to filter the strength of the fiber optic signal? Single-mode fiber is designed to carry a fiber optic signal long distances—as much as 70 kilometers (or 43.4 miles). Fiber devices send this signal with great force to ensure that the signal, and your data, arrive at the other end intact.

But when two fiber devices connected with single-mode fiber cable are close to each other, the signal may be too strong. As a result, the light signal reflects back down the fiber cable. Data can be corrupted and transmissions can be faulty. A signal that is too strong can even damage the attached equipment.

Because it’s probably not feasible to move your fiber equipment farther apart, the easiest solution is to attach an attenuator to each fiber device. Just as sunglasses filter the strength of sunlight, attenuators filter the strength of the light signal transmitted along single-mode fiber cable. Within the attenuator, there’s doping that reduces the strength of the signal passing through the fiber connection and minute air gaps where the two fibers meet. Fiber grooves may also be intentionally misaligned by several microns—but only enough to slow the fiber optic signal to an acceptable rate as it travels down the cable.

Before selecting an attenuator, you need to check the type of adapter on your fiber devices. Attenuators typically fit into any patch panel equipped with FC, SC, or LC adapters that contain either PC or APC contacts. In addition to the type of adapter, you also need to determine the necessary attenuation value, such as 5 or 10 dB. This value varies, depending on the strength of fiber optic signal desired. collapse

  • Pdf Drawing... 
  • CAT6a Shielded Jack with Universal Wiring (4-Pair) PDF Drawing
    PDF Drawing for the FMT700
 
  • Pdf Drawing... 
  • CAT6 Keystone Feed-Through Straight-Pinned Coupler (Unshielded, Black) PDF Drawing
    PDF Drawing for the FM692 (Version 1)
 

Product Data Sheets (pdf)...Surface-Mount Boxes

  • Brochure... 
  • Black Box Connect
    The smart choice for basic cabling and connectivity.
 

Black Box Explains…Terminating fiber.

Terminating fiber cable used to be a job for experts only. But today, prepolished connectors make it possible for anyone to terminate multimode fiber—all you need is a bit of... more/see it nowpatience and the right tools. Here’s how to terminate fiber with ST connectors:

Step 1 — Slide the connector strain-relief boot, small end first, onto the cable.

Step 2 — Using a template, mark the jacket dimensions to be stripped (40 mm and 52 mm from the end).

Step 3 — Remove the outer jacket from the cable end to the 40 mm mark. Cut the exposed Kevlar. Carefully remove the jacket to the 52-mm mark, exposing the remaining length of Kevlar.

Step 4 — Fan out the Kevlar fibers and slide the crimp ring of the connector approximately 5 mm over the fibers to hold them out of the way. Mark the fiber buffer 11 mm from the end of the cable jacket. Also, mark the buffer where it meets the jacket.

Step 5 — Bit by bit, strip off the buffering until you reach the 11-mm mark. Check the mark you made on the buffer at the jacket. If it’s moved, carefully work the buffer back into the jacket to its original position.

Step 6 — Clean the glass fiber with an alcohol wipe. Cleave the fiber to an 8-mm length.

Step 7 — Carefully insert the fiber into the connector until you feel it bottom out and a bow forms between the connector and the clamp. Cam the connector with the appropriate tool.

Step 8 — Crimp the connector.

Step 9 — Slide the crimp ring up the jacket away from the connector, releasing the Kevlar fibers. Fan the fiber so they encircle the buffer. The ends of the fibers should just touch the rear of the connector—if they’re too long, trim them now.

Step 10 — Crimp the connector again.

Step 11 — Slide the strain-relief boot over the rear of the connector. You might want to put a bead of 411 Loctite adhesive for extra strength on the rear of the boot where it meets the jacket.

Although the details may vary slightly with different connectors and termination kits, the basic termination procedure is the same. collapse

  • Pdf Drawing... 
  • Fiber Optic Coupling (MT-RJ%X96MT-RJ, Rectangular Mounting with Cap) PDF Drawing
    PDF Drawing for the FOT121
 

Black Box Explains... SCSI termination

Passive termination
This is the oldest method of termination. A passive terminator sits on the bus to minimize reflections at the end of the cable. Passive terminators simply provide impedance close... more/see it nowto that of the cable. The terminator is “passive” because it doesn’t do any work to regulate power for termination; it relies on the interface card to provide steady power.

Active termination
This is a more stable form of terminating SCSI cables. Active terminators control the impedance at the end of the SCSI bus by using a voltage regulator, not just the power supplied by the interface card.

Forced-perfect termination
Of all SCSI terminators, this is the most complex. A cable with a forced-perfect terminator can actually change its impedance to compensate for variations along the bus. Forced-perfect terminators force the impedance of the cable to match each device through diode switching and biasing. collapse

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