4Audio Fiber Link Instructions P/N 52230:A 3/26/04
Stacked
1. Attach two 4-40 x 0.75” standoffs to the PEM studs on the top row of the chassis.
2. Attach two 4-40 x 2” standoffs to the bottom of the rear AFL assembly plate using two 4-40 KEPs.
3. Slide rear AFL mounting plate into rear slot.
4. Attach rear AFL mounting plate by fastening two 4-40 x 2” standoffs to the 4-40 x 0.75” standoffs.
5. Stack the front AFL mounting plate by placing it on top of the four 4-40 x 2” standoffs, then fastening with four 4-40 x
0.37” screws.
Figure 5 CHS-4 Mounting, Stacked
About the Fiber Optic Cable
The attenuation of fiber optic cabling between the AFL-Tx and AFL-Rx must not exceed a 10 dB limit. At the system
design stage apply the following steps to establish the limit:
1. Find the maximum dB loss per foot within the cable manufacturer’s specifications. Determine the total attenu-
ation between the two nodes/repeaters due to the cable.
Loss = (loss/feet) x (length in feet)
2. Establish the dB loss for each connector and splice. Sum all the losses.
3. Add the attenuation factors obtained in steps one and two for a total. This will provide an approximate attenuation total.
The actual attenuation can be measured end-to-end with standard fiber optic test equipment using a signal wavelength
of 850 nanometers for multi-mode, or 1300 nanometers for single-mode.
The following are supported by Audio Fiber Links:
• Connectors: ST® Style (ST is a registered trademark of AT&T).
• Fiber type multi-mode for AFL-TM and AFL-RM
Core Size: 62.5/125 micrometers
Wavelength : 850 nanometers
• Fiber type single-mode for AFL-TS and AFL-RS
Core Size: 9/125 micrometers
Wavelength: 1300 nanometers
• Maximum attenuation of fiber optic link between AFL-Tx and AFL-Rx can not exceed 10 dB.
Applications
Audio Fiber Links may be used in systems where:
• the use of wire media is not possible due to security requirements
• fiber optic cable is already installed and available for low-level audio distribution
• significant distances between AMG-1/AMG-E and remote amplifier cabinets dictate the use of fiber
• high intensity electromagnetic fields of audible frequencies could be coupled to wire type low-level audio loop
• both distance and physical location of remote cabinets require the use of star topology.
Ta b
4-40 x 2” standoff positions for
rear AFL assembly.
4-40 x 0.37” screw positons
for stacked AFL assembly
Chassis
4-40 x 0.75”
standoff
Ta b s
4-40 x 0.37”
screw
4-40 x 2” standoffs
4-40 x 0.37”
screw
AFL mounting
plates
Side view, stacked
AFL
device
AFL
device
Top PEM studs
(right position
indicated)
Rear slot
(right position
indicated)
CHS-4L
4-40
KEP
Mounting
plate
AFL assembly
