ACCURATE ELECTRONICS 1040120000 User manual

Page 1 of 6
Model 10401200
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_10401200_RevA.pdf
CONTENTS:
Section 1. General 1
Section 2. Features 1
Section 3. Application 1
Section 4. Installation 2
Section 5. Options 2
Section 6. Circuit Description 2
Section 7. Mechanical Outline 3
Section 8. Specifications 3
Section 9. Testing and Troubleshooting 3
Section 10. Maintenance 3
Section 11. Warranty 3
Figure 1. Typical Application 1
Figure 2. Circuit Description 4
Figure 3. Mechanical Outline 4
Figure 4. External Connections Layout 5
Figure 5. Testing Guide Checklist 5
1. GENERAL
1.01 This practice provides application, specification, circuit and mechanical
description, maintenance, installation, and warranty information relating to
Accurate Electronics’ 4-wire 6-way Conference Bridge, Model 10401200.
2. FEATURES
Designed for voice conference applications for full 6-way
bridging of 4-wire transmission facilities.
Can be used with voice (VF) or data up to 9.6 kbps.
Zero dB loss bridge, with an adjustable gain of - 10 to + 22dB
(receive-to-transmit).
Selectable 7 dB (receive) and -16 dB (transmit) pads for each
bridge port, which allows proper interfacing with carrier
facilities.
Front-panel-mounted RX and TX calibration Bantam jacks, for
simplified alignment.
SX leads for each transmit and receive port.
Can be powered from - 48 VDC. (-22 TO -56 VDC)
3. APPLICATION
3.01 Model 10401200 is a 4-wire 6-way Active Conference Bridge. A voice
(VF) or data signal received at any receive port is transmitted to all other
transmit ports (minus the associated transmit port), providing leg to leg
communication. Front-panel-mounted transmit and receive gain adjustments
are provided for each bridge port. Proper adjustment allows all signals on the
bridge to be transmitted and received at the same level.
3.02 Model 10401200 mounts in one module mounting position of a Type 10
or 400 Relay Rack Shelf. They make electrical connection to the system via
a 56-pin, wire-wrapped, card-edge connector, provided as part of the shelf
mounting assembly.
3.03 The Model 10401200provides jumper selected insertion loss of -7dB in
each receive port and -16dB in each transmit port to facilitate interfacing with
carrier channel or other standard level 4wire interface (+7dB receive, -16dB
transmit). When lossless bridging is required, the 0dB jumper positions may
be selected.
3.04 Terminating impedance at both the input and output ports of the bridge
is 600 ohms, balanced. The modules’ active circuitry allows unused ports to
be left unterminated without affecting transmission performance of the ports
in use.
3.05 The bridge module incorporates an internally regulated power supply
that permits operation on -22 to -56 VDC input. Current requirement is 60mA
when powered from a nominal -48VDC power source. Reverse-battery
protection is provided in the modules’ internal power supply circuits.
Figure 1. Typical Application.
ACCURATE ELECTRONICS INC
PO BOX 1654 97075-1654 8687 SW HALL BLVD 97008 BEAVERTON OR USA 503.641.0118 FAX [phone]
WWW.ACCURATE.ORG
Practice Section 10401200 Rev A
4-WIRE 6-WAY ACTIVE CONFERENCE BRIDGE
MODEL 1040120000

ACCURATE ELECTRONICS INC Practice Section 10401200 Rev A 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
3.06 The bridge may be used in tandem to increase the number of available
ports in a 4wire bridge network. This is done by connecting the input and
output of one port (usually the last) of one bridge to the input and output,
respectively, of one port (usually the first) of another bridge module. Tandem
connection of two (2) Model 10401200 Bridges, for example, provides a
4wire 10way bridge. Tandem applications are generally accommodated in the
lossless mode, as loss in this mode through all input and output port
combinations is constant at 0 dB.
3.07 The limiting factor in the numberof modules that can be used in tandem
is cross-port coupling (crosstalk). The cumulative effect of cross-port
coupling generally limits the number of bridge modules that can be used in
tandem to three or four.
3.08 Because these are active bridges, as opposed to more conventional
resistive bridges, the level and impedance control functions may also be
performed by a pad-transformer module, instead of by more expensive line
amplifiers. One pad/transformer is required for each input and output port
used. If more gain is required at a particular port than can be provided by the
bridge module’s active circuitry, a line amplifier may be used instead of a
pad or pad/transformer module.
3.09 The 10401200 affords a choice of port-to-port insertion loss to permit
interfacing with a variety of facilities and equipment. If a carrier channel or
other standard-level 4-wire interface (+7dB receive, -16dB transmit) is
required, the total 23dB loss option is selected. When lossless bridging is
required, the 0dB option is selected. Option jumpers on each leg permit an
amount of port-to-port insertion loss to be selected: -7.0dB in receive ports
and -16dB in transmit ports, or 0dB.
4. INSTALLATION
Inspection
4.01 The bridge modules should be visually inspected upon arrival in order
to find possible damage incurred during shipment. If damage isnoted, a claim
should immediately be filed with the carrier. If stored, the module should be
visually inspected again prior to installation.
Mounting
4.02 Each module mounts in one position of the Type-10 mounting Shelf.
The module plugs physically and electrically into a 56-pin connector at the
rear of the Type-10 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 Attempts to troubleshoot the bridge internally is not recommended.
4.05 Figure 4 lists external connections to the module. All connections are
made via wire-wrap at the 56-pin connector at the rear of each module’s
mounting shelf position. Pin numbers are found on the body of the 56-pin
connector. Bridge module pin numbers are found on the printed circuit board,
even numbers on the component side, odd numbers on opposite.
NOTE: External connections are compatible with other manufacturers.
Level Adjustments
4.06 The receive levels are adjusted so that the levels from each port at the
input bridging point are all equal. The input bridging point is accessible at the
front panel RX OUT calibration jack. The receive levels are adjusted using
the front panel RX level controls and the -7dB receive pads located on the
main board. The receive level adjustment range is -4dB to +12dB when the
receive pad is in the 0 (zero) position and -11dB to +5dB when in the -7dB
position.
4.07 Connect a terminated transmission measurement set (TMS) to the RX
OUT calibration jack. Apply a tone separately to each receive port. Adjust
the RX level controls / receive pads as required to achieve equal levels from
each port. The specific value of the bridging level is determined by each
installation. Levels in the range of -10dB to 0dB are acceptable.
4.08 The transmit levels are set to meet the requirements of the equipment
connected at each transmit output port. The transmit levels are adjusted using
the front panel TX level controls and the -16dB transmit pads located on the
main board. The transmit level adjustment range is -6dB to +12dB when the
transmit pad is in the 0 (zero) dB position and -22dB to -4dB when in the -
16dB position.
4.09 Using a TMS inject a tone at the front panel TX IN calibration jack. The
level of the injected tone should be equal to the bridging level used above.
Adjust the TX level control / transmit pads as required to achieve the desired
level at each transmit port.
5. OPTIONS
5.01 Each line CIRCUIT of Model 10401200 contains two push-on jumper
options: one selects the -7 dB RCV PAD (CH1 to CH6 - RCV), and the other
selects the -16 dB XMT PAD (CH1 to CH6 - XMT). Locations of these
jumpers on the module’s printed circuit board are shown in FIGURE 3. These
jumpers are normallyset for the same amount of insertion loss, although they
may be set for different amounts if desired. Set all jumpers to the 0 position
for lossless (0dB insertion loss) bridging or set all jumpers to select 23dB
insertion loss as required for carrier-channel or other standard level (+7/-
16dB) 4-wire interfacing. After jumpers are set, further optioning or
alignment is required. (See Circuit Description 5.0)
Receive Pad Selection
5.02 The receive pad is normally selected when the Model 10401200
interfaces with a 4-wire carrier facility. The normal + 7 dBm receive level
from the carrier facility is attenuated by 7 dB, thus presenting a 0 dBm level
to the bridge.
Transmit Pad Selection
5.03 The XMT PAD is normally selected for carrier applications. The normal
0 dBm output from the bridge is attenuated by 16 dB, thus presenting a
standard - 16 dBm transmit level to the 4-wire carrier facility.
6. CIRCUIT DESCRIPTION
6.01 Model 10401200 provides summing and distribution of six VF or data
channels. This circuit description is intended to familiarize you with the 4-
wire 6-way Active Bridge modules for engineering and application purposes
only. Troubleshooting procedures should be limited to those prescribed in
Section 8 of this Practice. Please refer to the block diagrams, Figure 2 as an
aid in following the circuit description.
6.02 The Active Bridge circuitry is identical for each port of the bridge. This
circuitry consists of five-input summing circuit and, for each port output, an
integrated-circuit operational amplifier (op amp). The summing circuit
provides balanced 600 ohm terminating impedance for each input port. For a
particular output port, the summing circuit adds the transmission energyfrom
all other input ports (ie. all input ports except the one with the same number
as the output port) at a low-impedance summing point. The low impedance
of this summing point provides input port isolation.
6.03 The op amp provides switch-controlled gain to overcome the loss of the
summing circuit, and the 10401200 has six such networks.
6.04 References to transmit and receive are with respect to the bridge. All
transmit line and receive line circuits for each port are identical; therefore,
circuit description is based on RX Port 1 and TX Port 1.
6.05 Data or VF signals enter the Bridge on the RX Port 1 tip and ring leads
and are transformer-coupled (via T1) to the input of operational amplifier U-
1. A -7dB RX PAD can be selected to provide the proper level for 4-wire
carrier applications. The front-panel-mounted RX 1 LEVEL potentiometer,
connected in the feedback loop of U-1, provides a level of adjustment of -4
dB to + 12 dB. This is used to compensate for losses in the receive line. The
output of U-1 is coupled to the operational amplifiers associated with transmit
lines 2, 3, 4, 5, and 6 thru a summing network. Thus, all signals present at the
RX LINE 1 input appear at the TX LINE outputs of ports 2,3,4,5 and 6 but
not at the TX port of channel 1.

ACCURATE ELECTRONICS INC Practice Section 10401200 Rev A 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.
3
6.06 At the transmit side, signals from the RX Ports 2, 3, 4, 5, and 6 enter
operational amplifier U-3 and are transformer-coupled to the TX Port 1 tip
and ring leads via transformer T2. The front-panel-mounted TX LEVEL
control provides a range of -6dB to +12 dB to compensate for line losses. A
-16 dB XMT PAD can be jumpered in the circuit for carrier applications.
6.07 The circuit operation for RCV Ports 2, 3, 4, 5 and 6 is identical to RX
Port 1. In all cases, the signals present on a given RCV LINE are coupled to
all XMT LINE ports, except the XMT LINE port associated with the RCV
LINE port that is originating the signals.
Calibration Circuits
6.08 The outputs of the six RX Port operational amplifiers appear at the input
of the RX TEST AMP. This amplifier provides an impedance match for an
AC voltmeter, which is plugged into the RCV CAL Bantam jack during the
receive alignment.
6.09 The output of the TX TEST AMP is coupled to the inputs of the six TX
LINE operational amplifiers. The TX TEST AMP, in conjunction with the
TX CAL Bantam jack, provides the interface for an oscillator, which is used
for the transmit level alignment on each transmit line.
5.10 An internally regulated power supply allows operation on external -22
to -56VDC input, and ground.
7. MECHANICAL OUTLINE
7.01 See FIGURE 2.
8. SPECIFICATIONS
8.01 Electrical
Power Requirements: - 48VDC (-22 to -56VDC)
Maximum Input current (at -48 V Battery): 60 mA
Reverse Battery Protection Ground
Transmission: Insertion Loss:
factory adjusted to 0 dB dB
Can be adjusted from -10 dB to +23 dB
jumper selectable
maximum output level (overload point) +10dBm
Frequency Response: +/- 5 dB, 300 Hz to 3.2 kHz
(referenced to 1 kHz)
Harmonic Distortion: < 5 % at + 10 dBm
Port Impedance: all ports 600 ohms, +/- 10%, balanced
Idle Noise: < 18 dBrn C at +22 dB bridge gain
Envelope Delay Distortion: < 100 microseconds, 300 Hz to 4 kHz
Longitudinal Balance: > 60 dB, 200 Hz to 3.5 kHz
Crosstalk (receive path to transmit path): > 60 dB, 300 Hz to 1 kHz
> 50 dB, to 3.3 kHz
8.02 Environmental
Operating Temperature: 0 - 49° C
Humidity: up to 95% R.H., no condensation
Altitude: up to 15,000 ft.(4,572 m)
8.03 Physical
Calibration /Test: Bantam jacks
Potentiometer Adjust: slotted screw
Dimensions: 5.600 “H x 1.500 ”W x 6.000 “D
14.224cmH x 3.810cmW x 15.240cmD
Weight: 15 oz. / 0.425 kg
Mounting: One module mounting position
in a type 10 or 400 Relay Rack Shelf
Silkscreen (front panel): white over black anodize
Silkscreen (PCB): white over green
9. TESTING AND TROUBLESHOOTING
9.01 The Testing Guide Checklist (see Figure 5) 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
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
9.02 Contact Accurate Electronics, Inc. 503.641.0118, FAX: [phone];
Mail: PO Box 1654, Beaverton OR 97075-1654.
RETURN PROCEDURE (FOR REPAIR)
9.03 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.
10. MAINTENANCE
10.01 No preventive maintenance is required. General care is recommended.
11. WARRANTY
11.01 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.
11.02 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
11.03 If a product is diagnosed a defective, follow the replacement procedure
in paragraph 11.04 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 11.05.
Replacement
11.04 To obtain a replacement product, notify Accurate Electronics. Be sure
to provide all relevant information, including the 10401200 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
11.05 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

ACCURATE ELECTRONICS INC Practice Section 10401200 Rev A 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.
4
FIGURE 3. MECHANICAL OUTLINE.
FIGURE 2. CIRCUIT DESCRIPTION.

ACCURATE ELECTRONICS INC Practice Section 10401200 Rev A 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 5. Testing Guide Checklist.
NOTE: when a signal is inserted at any input port of the bridge and/or when measurements are made at any output port, be certain that the test
equipment is arranged to accommodate the balanced 600 ohm impedance at these ports.
Test
Test Procedure
Normal Result
If normal conditions are not met, verify:
Insertion Loss
Connect test oscillator arranged for 1000Hz signal at
0 dBm to any input port (see FIG 5 for pin
assignments). Using transmission measuring set,
measure output level first at output port 1,2,3, or 4 and
then at output port 5 or 6. Do not, however, use output
port with same number and input port to which
oscillator is connected.
With CH1 to CH6 RCV and
CH1 to CH6 XMT set to 0
position, output level approx.
same as input.
- Power applied to module.
- Wiring.
- Proper impedance terminations (check for double terminations)
- Jumper CH1 to CH6 RCV and/or jumper CH1 to CH6 XMT in proper positions.
- Input level.
Noise
Connect shorting straps between tip and ring
connector pins of all input ports (see Figure 4. For
terminal assignments). Using noise test set, measure
noise level across tip and ring connector pins of
output port 1,2,3 or 4 and also across tip and ring
connector pins of output port 5 or 6.
Noise level less than 18 dBm
for all insertion loss settings of
jumpers.
- All input ports shorted as directed.
- Noise test set at proper terminating impedance.
- High therefore environment affecting R.F. test set.
FIGURE 4. External Connections Layout.
GOLD PINS
INPUT PORT 6
RING
56
55
TIP
INPUT PORT 6
INPUT PORT 6
Sx
54
53
RING
OUTPUT PORT 4
52
51
TIP
OUTPUT PORT 4
INPUT PORT 5
Sx
50
49
Sx1
OUTPUT PORT 4
INPUT PORT 5
RING
48
47
INPUT PORT 5
TIP
46
45
44
43
42
41
OUTPUT PORT 5
TIP
40
39
RING
OUTPUT PORT 5
38
37
Sx1
OUTPUT PORT 5
36
35
BATT
-48VDC INPUT
34
33
32
31
INPUT PORT 4
Sx
30
29
INPUT PORT 4
RING
28
27
INPUT PORT 4
TIP
26
25
Sx1
OUTPUT PORT 6
INPUT PORT 3
RING
24
23
INPUT PORT 3
TIP
22
21
Sx1
OUTPUT PORT 2
20
19
OUTPUT PORT 3
Sx1
18
17
GND
INPUT PWR
INPUT PORT 3
Sx
16
15
Sx
INPUT PORT 1
INPUT PORT 2
Sx
14
13
TIP
OUTPUT PORT 6
INPUT PORT 2
RING
12
11
RING
OUTPUT PORT 6
INPUT PORT 2
TIP
10
9
Sx1
OUTPUT PORT 1
OUTPUT PORT 3
TIP
8
7
RING
OUTPUT PORT 2
OUTPUT PORT 3
RING
6
5
TIP
OUTPUT PORT 1
OUTPUT PORT 2
TIP
4
3
RING
OUTPUT PORT 1
INPUT PORT 1
RING
2
1
TIP
INPUT PORT 1

ACCURATE ELECTRONICS INC Practice Section 10401200 Rev A 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
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