ACCURATE ELECTRONICS 104445A User manual

Page 1 of 6
Model 104445A
January 2014
This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
Prac_104445A_RevB.pdf
Contents:
Section 1. General 1
Section 2. Application 1
Section 3. Specifications 2
Section 4. Installation 2
Section 5. Circuit Description 3
Section 6. Mechanical Outline 3
Section 7. Testing and Troubleshooting 3
Section 8. Maintenance 4
Section 9. Warranty 4
Figure 1. Circuit Description 5
Figure 2. Mechanical Outline 6
Figure 3. S1, S2 Locations 3
Table 1. External Connections 3
Table 2. Splitter/Combiner Impedance Switch Settings 2
Table 3. Splitter/Combiner Attenuator Switch Settings 2
Table 4. Test Guide Checklist 4
1. GENERAL
1.01 This practice provides application, specification, circuit and mechanical
description, maintenance, installation, and warranty information relating to
Accurate Electronics’ Dual 5 Way Balanced Active Data Bridge, Model
104445A.
1.02 The 104445A Dual 5-Way Balanced Active Data Bridge module
(Figure 1) provides balanced termination and active level control for a single
4-Wire common port and up to four 4-Wire multiple ports. Independent
splitter and combiner channels allowfull-duplex (simultaneous bidirectional)
data transmission.
1.03 The 104445A follows a conventional split bridge format, i.e., the
common port interfaces the multiple ports through separate splitter and
combiner channels. In the splitter channel, a single common input is divided
through the bridge to provide outputs for the four multiple ports. In the
combiner channel, inputs from the four multiple ports are connected through
the bridge and to the single common output port. The common splitter input
level can be attenuated by one of three switch-selectable settings of 0, -7, or
–25dB, and the common combiner output by switch-selectable values of 0, -
16, or –25dB.
1.04 The 104445A is an active bridge, that is, it includes integral
amplification circuitry. Splitter gain and combiner gain at each multiple port
are continuously adjustable over a –10 to +10dB range via independent
splitter and combiner front-panel level controls.
1.05 All ports of the 104445A are transformer coupled, and the transformers
at these ports are center-tapped to derive balanced simplex leads. The
module’s common port can be switch-optioned for 150, 600, or 1200-ohm
terminating impedance, while the terminating impedance of each multiple
port is fixed at 600 ohms. The 150-ohm option affords a small degree of
amplitude equalization when the common-port facility consists of non-loaded
cable.
1.06 Splitterand combiner bus extension leads on the module allow from two
(2) to fourteen (14) 104445A’s to be connected in tandem without
performance degradation, yielding a bridge system with up to 56 multiple
ports.
1.07 A complement of 10 front-panel bantam-type jacks facilitates alignment
and maintenance of the 104445A. All ten (10) jacks are the opening type.
The splitter in jack faces the common-port facility to permit measurement of
the incoming signal level, while all other jacks face the module to allow
measurement of the splitter and combiner levels at each port.
1.08 The 104445A contains an internally regulated power supply that permits
operation on filtered, ground-referenced –22 to –56VDC input. With all
amplifiers at their maximum output levels, the module draws a maximum
current of 70mA.
1.09 A Type-10 module, the 104445A mounts in one position of Accurate
Electronics’ Type-10 Mounting Shelf, versions of which are available for
relay-rack and apparatus-case installations. In relay-rack applications, up to
12 modules can be mounted across a 19-inch rack, while up to 14 modules
can be mounted across a 23-inch rack. In either case, the shelves require 6
inches of vertical rack space.
2. APPLICATION
2.01 The 104445A Dual 5-Way Balanced Active Data Bridge is normally
used to interconnect several 4-Wire data modems to a common data channel
or link. Typically, the common data link is terminated at the distant end by
a central processor unit (CPU) or computer that time-sequence-polls various
remote data terminals. A 104445A is used to provide the central transmission
bridge arrangement, or hubbing network, that extends data transmission to
the outlying terminals.
2.02 All ports of the 104445A are transformer-coupled, and each transformer
is center-tapped to derive a balanced simplex lead. Since these ports are
transformer-coupled, modems with balanced and unbalanced terminations
can be intermixed without affecting established transmission parameters. In
addition, transformer coupling also prevents induced transients, or noise
spikes, from degrading transmission quality on cable runs in excess of 1
kilofoot.
2.03 The modems used with the 104445A need not share common interface
levels. The 104445A’s active level-control circuitry can be adjusted to
accommodate any modem’s interface requirements (within the specified gain
ranges) without affecting the settings of the other ports. Each multiple port
is equipped with independent splitter and combiner gain controls that are
adjustable over a –10 to +10dB range. These controls are non-interactive,
ACCURATE ELECTRONICS INC
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
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Practice Section 104445A Rev B
DUAL 5-WAY BALANCED ACTIVE DATA BRIDGE
MODEL 104445A

ACCURATE ELECTRONICS INC Practice Section 104445A Rev B January 2014
WWW.ACCURATE.ORG PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
2
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 tocontrol 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 150ohms +15%,
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 104445ADual 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

ACCURATE ELECTRONICS INC Practice Section 104445A Rev B January 2014
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This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
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attenuator switches are set to -7dB,
the gain range of the splitter in
ports is +3 to –17dB. The splitter
attenuator switches, then, should be
set based on the incoming signal
level at the splitter in port and on
the input level(s) required by the
modems connected to the multiple
ports. Select the splitter attenuator
switch setting that places the
midpoint of the 20dB gain range at
each of the splitter out portsnearest
the input level required by the
modems. This same principle
applies to the combiner attenuator
switch setting (S1-3 and S1-4),
except that this setting is based on
the OUTPUT level of the modems
and the level required at the
combiner out port. Splitter and
combiner switch settings are listed
in Table 3.
4.07 To adjust the levels at the
splitter output ports, first set S2-3 and S2-4 as described in paragraph 4.06
and then request that 1004hz test tone be sent from the distant end at the level
specified on the CLR. With a 600-ohm terminated voltmeter connected to
the split out 1 jack, adjust the split out level 1 control to the level required by
the modem connected to port 1. Repeat this procedure for the remaining split
out ports.
4.08 To adjust the levels in the combiner channel, first set S1-3 and S1-4 as
described in paragraph 4.06. Then connect a voltmeter, terminated at the
impedance of the comb out port, to the comb out jack. Next, insert 1004Hz
test tone, at the transmit level of the modem, into the comb in 1 jack. Finally
adjust the comb in level 1 control to the level specified on the CLR. Repeat
this procedure for the remaining comb in ports.
5. CIRCUIT DESCRIPTION
5.01 See Figure 1.
5.02 This circuit description is intended to familiarize you with the 104445A
Dual 5-Way Balanced Active Data Bridge for engineering and application
purposes only. Attempts to troubleshoot the 104445A are not recommended
and may void your warranty. Troubleshooting procedures should be limited
to those described in Section 7 of this Practice. Please refer to Figure 1 as an
aid in following the circuit description.
5.03 The combiner channel of the 104445A consists of four (4) transformer-
coupled input ports and four (4) variable-gain operational amplifiers. The
output of each of the four (4) op-amps is combined in a summing amplifier
along with the bus extension input signal. The summing amplifier, which can
be set to one of three (3) switch-selected gain ranges, applies its output to the
power amplifier, impedance option switches, and finally to the balanced
output transformer. Both input and output transformers provide balanced
terminations, and their center taps, simplex leads.
5.04 The splitter channel includes a center-tapped balance transformer,
switch-selectable impedance option, and a distribution amplifier whose gain
range can be switch-set at any of three (3) levels. the output of the
distribution amplifier is applied to four (4) variable-gain op-amps, which
drive the splitter out-out ports, and to one fixed-gain buffer amplifier that
drives the bus extension output line. The four (4) variable-gain amplifiers
each apply their signals to the splitter output ports through individual power
amplifiers and center-tapped balance transformers.
5.05 An integral regulated power supply permits operation with an external
input between –22 and –56VDC. Reverse-battery protection is provided by
a blocking diode, while a high-voltage zener diode protects against transients
on the input line.
6. MECHANICAL OUTLINE
6.01 See Figure 2.
7. TESTING AND TROUBLESHOOTING
7.01 The Testing Guide Checklist (see Table 4.) may be used to assist in the
installation, testing or troubleshooting of the product. The checklist is
intended as an aid in the localization of trouble to a specific product. If a
product is suspected of being defective, a new one should be substituted and
the test conducted again. If the substitute product operates correctly, the
original product should be considered defective and returned to Accurate for
repair or replacement as directed below. We strongly recommend that no
TABLE 1. External Connections.
PORT 1
COMBINER INPUT TIP
31
PORT 1
COMBINER INPUT RING
29
PORT 1
COMBINER INPUT SX (Simplex)
56
PORT 1
SPLITTER OUTPUT TIP
21
PORT 1
SPLITTER OUTPUT RING
25
PORT 1
SPLITTER OUTPUT SX (Simplex)
22
PORT 2
COMBINER INPUT TIP
37
PORT 2
COMBINER INPUT RING
55
PORT 2
COMBINER INPUT SX (Simplex)
54
PORT 2
SPLITTER OUTPUT TIP
19
PORT 2
SPLITTER OUTPUT RING
23
PORT 2
SPLITTER OUTPUT SX (Simplex)
20
PORT 3
COMBINER INPUT TIP
39
PORT 3
COMBINER INPUT RING
53
PORT 3
COMBINER INPUT SX (Simplex)
52
PORT 3
SPLITTER OUTPUT TIP
15
PORT 3
SPLITTER OUTPUT RING
1
PORT 3
SPLITTER OUTPUT SX (Simplex)
16
PORT 4
COMBINER INPUT TIP
49
PORT 4
COMBINER INPUT RING
51
PORT 4
COMBINER INPUT SX (Simplex)
50
PORT 4
SPLITTER OUTPUT TIP
5
PORT 4
SPLITTER OUTPUT RING
3
PORT 4
SPLITTER OUTPUT SX (Simplex)
4
BUS EXTENTION INPUT TIP
28
BUS EXTENTION INPUT RING
26
BUS EXTENTION OUTPUT TIP
8
BUS EXTENTION OUTPUT RING
10
COMMON SPLITTER INPUT TIP
7
COMMON SPLITTER INPUT RING
13
COMMON SPLITTER INPUT SX (Simplex)
9 or 11
COMMON COMBINER OUTPUT TIP
41
COMMON COMBINER OUTPUT RING
47
COMMON COMBINER SPLITTER OUTPUT SX(Simplex)
43 or 45
-BATT (-22 TO -56 VDC Filtered Input)
35
GND (ground)
17
FIGURE 3. S1, S2 Locations.

ACCURATE ELECTRONICS INC Practice Section 104445A Rev B January 2014
WWW.ACCURATE.ORG PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
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internal (component-level) testing or repairs be attempted on the product.
Unauthorized testing or repairs may void the product’s warranty. Also, if the
product is part of a registered system, unauthorized repairs will result in
noncompliance with Part 68 of the FCC Rules and Regulations.
TECHNICAL ASSISTANCE
7.02 Contact Accurate Electronics, Inc. 503.641.0118, FAX: [phone];
Mail: PO Box 1654, Beaverton OR 97075-1654.
RETURN PROCEDURE (FOR REPAIR)
7.03 To return equipment for repair, first contact Accurate Electronics, Inc.
Enclose an explanation of the malfunction, your company’s name and
address, the name of a person to contact for further information, and the
purchase order number for the transaction. Accurate Electronics will inspect,
repair, and retest the equipment so that it meets its original performance
specifications and then ship the equipment back to you. If the equipment is
in warranty, no invoice will be issued.
8. MAINTENANCE
8.01 No preventive maintenance is required. General care is recommended.
9. WARRANTY
9.01 All Accurate Electronics Inc. products carry a full FIVE (5) YEAR
warranty on materials and workmanship. See WARRANTY in front of
catalog.
Note: Warranty service does not include removal of permanent customer
markings on the front panels of Accurate Electronics’ products, although an
attempt will be made to do so. If a product must be marked defective, we
recommend that it be done on a piece of tape or on a removable stick-on
label.
9.02 If a situation arises that is not covered in the checklist, contact Accurate
Customer Service as follows (telephone number are given below):
Contact Accurate Electronic Customer Service
9.03 If a product is diagnosed a defective, follow the replacement procedure
in paragraph 9.04 when a critical service outage exists (e.g., when a system
of a critical circuit is down and no spares are available). If the situation is not
critical, follow the repair and return procedure in paragraph 9.05.
Replacement
9.04 To obtain a replacement product, notify Accurate Electronics. Be sure
to provide all relevant information, including the 104445A part number that
indicates the issue of the product in question. Upon notification, we shall
ship a replacement product to you. If the product in question is in warranty,
the replacement will be shipped at no charge. Pack the defective product in
the replacement product’s carton, sign the packing slip included with the
replacement, and enclose it with the defective product (this is your return
authorization). Affix the preaddressed label provided with the replacement
product to the carton being returned, and ship the product prepaid to Accurate
Electronics.
Repair and Return
9.05 Return the defective product, shipment prepaid, to Accurate Electronics
Inc. :
ACCURATE ELECTRONICS INC.
ATTN: REPAIR AND RETURN
8687 SW HALL BLVD. #100
BEAVERTON, OREGON 97008 USA
TABLE 4. Test Guide Checklist.
TEST:
TEST PROCEDURE:
NORMAL RESULTS:
IF NORMAL RESULTS ARE NOT MET,
VERIFY:
Combiner gain:
Multiple port
(+10 to -10dBm)
Open S1-3 and S1-4. Connect VOM or TMS
(terminated at 600 ohms) to COMB OUT
jack. Inject 1000Hz test tone (0dBm) into
COMB IN 1 jack. Adjust COMB LEVEL 1
potentiometer to maximum and minimum
level. Repeat for COMB IN 2, 3 and 4.
Signal is at least -10 dBm at minimum, and at
least +10 dBm at high level.
Check power connection?
Check double termination?
S1 properly set?
Combiner gain:
Common port
(0, -16, and
-25dBm)
Open S1-3 and S1-4. Connect VOM or TMS
(terminated at 600 ohms) to COMB OUT
jack. Inject 1000Hz test tone (0dBm) into
COMB IN 1 jack. Adjust COMB LEVEL 1
potentiometer to 0dBm level.
S1-3 and S1-4 open, level is 0dBm.
S1-3 closed and S1-4 open, level is –16dBm.
S1-3 open and S1-4 closed, level is -25dBm.
Check power connection?
Check double termination?
Combiner
Channel
Noise
Short all inputs to combiner and bus
extension in. Measure noise at COMB OUT
jack.
Noise level under 20dBrnC at all gain settings.
Inputs to combiner shorted?
Noise test set at proper terminating impedance?
High RF environment affecting test set?
Splitter gain:
Multiple port
(+10 to -10dBm)
Open S2-3 and S2-4. Connect VOM or
TMS (terminated at 600ohms) to SPLITTER
OUT 1 jack. Request 1000Hz test tone at
CLR level from distant end. Adjust SPLIT
LEVEL 1 potentiometer to maximum and
minimum levels. Repeat for SPLIT OUT 2,
3 and 4.
Signal is at least –10dBm at minimum, and at
least +10dBm at maximum.
Check power connection?
Check double termination?
S2 properly set?
Splitter gain:
(0, -7, and
-25dBm)
Open S2-3 and S2-4. Connect VOM or
TMS (terminated at 600 ohms) to SPLIT
OUT 1. Request 1000Hz test tone at CLR
LEVEL from distant end. Adjust SPLIT
LEVEL 1 potentiometer to 0dBm level.
S2-3 and s2-4 open, level is 0dBm.
S2-3 closed and S2-4 open, level is –7dBm.
S2-3 open and S2-4 closed, level is -25dBm.
Check power connection?
Check double termination?
Splitter Channel
Noise
Short splitter input. Measure noise at one
SPLITTER OUT jack.
Noise level less than 20dBrnC at all gain
settings.
Input to splitter shorted?
Noise test set at proper terminating impedance?
High RF environment affecting test set?

ACCURATE ELECTRONICS INC Practice Section 104445A Rev B January 2014
WWW.ACCURATE.ORG PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
5
FIGURE 1. CIRCUIT DESCRIPTION.

ACCURATE ELECTRONICS INC Practice Section 104445A Rev B January 2014
WWW.ACCURATE.ORG PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
This document contains proprietary information and is supplied for identification, maintenance, engineering evaluation or inspection purposes only and shall not be duplicated or disclosed without written
permission of: ACCURATE ELECTRONICS INC By accepting this document the recipient agrees to make every effort to prevent unauthorized use of this information.
6
FIGURE 2. MECHANICAL OUTLINE.