ACCURATE ELECTRONICS INC
Practice Section 104445A Rev B January 2014
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX 503.646.3903
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allowing the level setting of any multiple ports to be varied without affecting
the setting of the other multiple ports in the bridge system. The independent
level controls at each multiple port also eliminate the need for separate pad
modules to control signal levels, thus saving rack space as well as simplifying
maintenance and alignment.
2.04
Although a single 104445A provides four multiple ports, the number of
modems hubbed to a single data channel can be increased beyond four
through the use of the module’s bus extension leads and additional
104445A’s. For example, by connecting the combiner OUT of one 104445A
to the bus extension IN of another 104445A and the splitter IN of this
104445A to the bus extension OUT of the first, the two modules function as
a dual 9-Way data bridge. Connected in this manner (see Figure 2.), the 4-
Wire data hubbing network can be expanded to include up to twelve (12)
104445A’s in a 19-inch shelf, or up to fourteen (14) modules in a 23-inch
shelf. The 12-module data bridge can thus provide up to forty-eight (48)
multiple ports, and the 14-module system up to 56, the maximum number
recommended without impairing the performance of the system.
3. SPECIFICATIONS
3.01 Electrical
Splitter-channel common-port attenuation:
0, -7, -25dB
(switch selectable)
Splitter-channel multiple-port gain:
-10 to +10dB
usable range (continuously adjustable)
Combiner-channel common-port attenuation:
0, -16, -25dB
(switch selectable)
Combiner-channel multiple-port gain:
-10 to +10dB
usable range (continuously adjustable)
Maximum output level (overload point): Splitter:
+12dBm
Combiner:
+12dBm
Combiner input port impedance:
600 ohms +5% (balanced)
Combiner Output Port Impedance:
600 or 1200 ohms +5% or 150 ohms +15%,
balanced, switch selectable
Splitter Input Port Impedance:
600 or 1200 ohms +5% or 115%,
balanced, switch selectable
Splitter Output Port Impedance:
600 +5% ohms, balanced
Total Harmonic Distortion (each channel): less than 1% at +12dBm
Noise:
20dBrnC maximum
Frequency Response:
+0.5dB re 1000Hz level, 300to 5000Hz
Delay Distortion: less than 75 microseconds, 400 to 3000Hz
Cross-port Coupling Loss (crosstalk):
greater than 70dB @ 0dB gain with output level +12dBm
Input Power Requirements:
Voltage: -22 to –56 VDC, filtered, ground referenced
Current: 70mA maximum at maximum output levels
3.02 Environmental
Operating Temperature:
20 - 130° F, (-7 To 54° C)
Humidity:
up to 95% R.H. / no condensation
3.03 Physical
Dimensions:
1.420"W x 5.580"H x 5.960"D
3.610 cmW x 14.170 cmH x 15.140 cmD
Weight:
22 oz. / 622 g.
Mounting: One (1) shelf position, Type-10, AEI Mtg Shelf.
4. INSTALLATION
INSPECTION
4.01
The 104445A Dual 5-Way Balanced Active Data Bridge module should
be visually inspected upon arrival to find possible damage incurred during
shipment. If damage is noted, a claim should immediately be filed with the
carrier. If stored, the module should be visually inspected again prior to
installation.
MOUNTING
4.02
The 104445A module mounts in one position of Accurate Electronics’
Type-10 Mounting Shelf. The module plugs physically and electrically into
a 56-pin edge connector at the rear of the shelf.
INSTALLER CONNECTIONS
4.03
Before making any connections to the mounting shelf, make sure that
power is OFF and modules are REMOVED. Modules should be put into
place only AFTER they are properly optioned and AFTER wiring is
completed.
4.04
Table 1 lists external connections to the 104445A module. All
connections are made via wire wrapping at the 56-pin edge connector at the
rear of the module’s mounting shelf position. Pin numbers are found on the
body of the connector.
OPTIONS
4.05
The 104445A can be switch-optioned for 150-, 600-, or 1200-ohm
facility-side terminating impedance in both the splitter and the combiner
channels. These switch settings are listed in Table 2 and their locations are
shown in Figure 3.
ALIGNMENT
4.06
At the common port, the splitter and combiner channels of the 104445A
can be independently switch-optioned for any of three attenuator settings,
each of which shifts the 20dB overall gain range of the multiple ports. For
example, when splitter attenuator switches S2-3 and S2-4 are set to 0dB, the
gain range of the splitter in ports is +10 to –10dB. When the splitter
TABLE 2.
Splitter / Combiner Impedance Switch Settings.
Combiner Output Impedance (ohms)
Switch #
150
600
1200
S1-1
ON
ON
OFF
S1-2
ON
OFF
OFF
Splitter Input Impedance (ohms)
Switch #
150
600
1200
S2-1
ON
ON
OFF
S2-2
ON
OFF
OFF
TABLE 3
. Splitter / Combiner Attenuator Switch Settings.
Common-port Splitter
Attenuation (dB)
Switch Settings
Resultant Splitter Gain range at
Multiple ports (dB)
S2-3
S2-4
0
OFF
OFF
-10 to +10
-7
ON
OFF
-17 to +3
-25
OFF
ON
-35 to -15
Common-port Combiner
Attenuation (dB)
S1-3
S1-4
Resultant Combiner Gain range
at Multiple ports (dB)
0
OFF
OFF
-10 to +10
-16
ON
OFF
-26 to -6
-25
OFF
ON
-35 to -15