1 x 4 Multi-Channel Switch Matrix
7/28/2004
Aeroflex / Weinschel Subsystems
Multi-Channel
1 X 4 Switch Matrix
Design Concept
28 July 2004
Prepared by:
5305 Spectrum Drive, Frederick, MD 21703
301-846-9222 ● Fax: 301-846-9116 ● www.aeroflex-weinschel.com
© COPYRIGHT 2004 Aeroflex / Weinschel Inc.
All Rights Reserved.
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
7/28/2004
TABLE OF CONTENTS
1
INTRODUCTION........................................................................................................................3
2 SCOPE .........................................................................................................................................3
3 GENERAL SPECIFICATIONS ..................................................................................................4
3.1
RF SPECIFICATIONS............................................................................................................4
3.1.1
1 x 4 (Input or Output) Terminated Switch..........................................................4
3.1.2
1 x 4 Non-Terminated Switch ..............................................................................4
3.2 DESIGN ...............................................................................................................................5
3.2.1
Power Supply .......................................................................................................5
3.2.2
Controller .............................................................................................................5
3.2.3
Microwave Switches ............................................................................................6
3.2.4
Ethernet SNMP Specifications.............................................................................7
4
CERTIFICATION........................................................................................................................8
5 QUALITY ASSURANCE ...........................................................................................................8
6 DESIGN RIGHTS........................................................................................................................8
INTELLECTUAL PROPERTY NOTICE
The design concepts presented in this paper are offered for consideration in
developing specific solutions for our customers, and remain the exclusive property
of Aeroflex / Weinschel. Any unauthorized copying, distribution, or conversion
of the contents of this paper for other purposes without the prior written consent of
Aeroflex / Weinschel is strictly prohibited.
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
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7/28/2004
Introduction
Aeroflex / Weinschel is pleased to present this technical paper describing a Multi-Channel 1 x 4
Switch Matrix. Designs of this type are intended for use as remote controllable RF patch panels.
Aeroflex / Weinschel develops and manufactures high-quality, high-reliability microwave and RF
components and Subsystems. Aeroflex / Weinschel has over 25 years of product development
experience in satellite and communications systems, test, measurement and simulation of wireless
systems, including 3G, WCDMA, PCS, and GSM; cable modem test sets and precision microwave
and RF instrumentation. Aeroflex / Weinschel is well positioned to deliver designs based upon this
Multi-Channel 1 x 4 Switch Matrix.
Features:
• 1x4 switch matrix channels
• Configure from 1 to 14 channels
• Latching Relay design
• DC – 3GHz, (usable to 4GHz)
• The Ethernet controller
The Switch Matrix is a modular design, allowing the end customer to configure from 1 to 14, 1x4
switch matrix channels within the chassis. Each channel can be cabled to the next channel thereby
expanding the configuration by adding 1x4 matrix boards and external cables. The internal power
supply has enough capacity to run the full fourteen-channel configuration. The Ethernet controller
will poll the Switch Matrix chassis to determine how many 1x4 switch matrix channels are installed.
Additionally the external cable connections can be input to the software so the external computer
control knows whether it is controlling a 1x4 matrix, a 1x 7, 1x10, etc. The matrix can be configured
by the formula 3(Channels –1) + 4 by 1 matrix size. (Example, 4 channels are installed, 3(4-1)+4 =
13 by 1 matrix size. So the operator would have access to a 1x13 matrix with 4 channels installed.
The switch can also be run/constructed as multiple independent 1x4 or greater channels. The operator
can run fourteen, 1x4 matrixes, two 1x18…etc, matrices within one chassis.
2
Scope
Aeroflex / Weinschel’s design approach uses a highly adaptable platform that allows a dense
integration of switches. The switch matrix chassis can contain fourteen, 1x4-switch modules. Once a
system is fielded it can be maintained through the exchange of front panel switches, the Ethernet
controller and power module. The Switch Matrix System software can be controlled through a 10
Base T TCP/IP software link or RS-232 controller. Field level software upgrades or maintenance will
be available through a TCP/IP link or via the RS232 link.
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
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3.1
7/28/2004
General specifications
RF Specifications
The design can be purchased with either terminated or non-terminated switches. Specifications for
each option are listed below. The quote will present both options to the customer.
3.1.1
1 x 4 (Input or Output) Terminated Switch
Specifications:
Standard
Goal
Switch
Frequency:
Configuration:
Impedance:
Insertion Loss:
RF Input Power:
Isolation:
Channel to channel
Terminated to common
RF connector:
Size:
VSWR:
Control:
Electromechanical latching
DC – 3GHz
1 x 4 terminated
50 ohm
4 dB
30 dBm
Electromechanical latching
DC – 3GHz, (usable to 4GHz)
1 x 4 terminated
50 ohm
3 dB
30 dBm
50 dB
50 dB
SMA Female*
5.25 h x 19 w x 10 d
1.8
Ethernet SNMP, RS232
60 dB
60 dB
SMA Female*
5.25 h x 19 w x 10 d
1.4
Ethernet SNMP, RS232
3.1.2
1 x 4 Non-Terminated Switch
Specifications:
Standard
Goal
Switch
Frequency:
Configuration:
Impedance:
Insertion Loss:
RF Input Power:
Isolation:
Channel to channel
Terminated to common
RF connector:
Size:
VSWR:
Control:
Electromechanical latching
DC – 3GHz
1 x 4 terminated
50 ohm
3 dB
30 dBm
Electromechanical latching
DC – 3GHz, (usable to 4GHz)
1 x 4 terminated
50 ohm
2.2 dB
30 dBm
30 dB
45 dB
SMA Female*
5.25 h x 19 w x 10 d
1.8
Ethernet SNMP, RS232
40 dB
50 dB
SMA Female*
5.25 h x 19 w x 10 d
1.4
Ethernet SNMP, RS232
* Alternate RF connectors available.
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
3.2
7/28/2004
Design
The Multi-Channel 1x4 Switch Matrix design will be delivered in a chassis with a power supply and
an Ethernet controller. The Power Supply, Ethernet Controller and the 1x4 Switches will be
connected to a back plane that will accept up to 14 switch cards, (See Figure 1). The RF connectors
to the switch cards will be on the front of the chassis. This proposal is for a configuration of one
chassis with a power supply, a controller and 4 switch cards. Ten blank plates will cover the nonused slots.
Figure 1. System with 14 switch cards, Power Supply and Controller.
3.2.1
Power Supply
The power supply is a 20-Watt unit that is capable of operating the controller and all switches
inserted into the chassis. The power supply can operate with 120 – 240 VAC, 50 – 60 Hz. There is
also a DC input connection rated from -40 to -70 VDC. The input is user selectable with a recessed
slide switch.
3.2.2
Controller
The controller is a user communication interface to control the chassis hardware. The communication
protocols are Ethernet 10BaseT SNMP and RS232. Control and status of each card is maintained
through this controller. A unique address is assigned to each hardware slot to allow the controller to
address each card independently. The switch cards relays are latching DPDT relays. One half of the
relay is used to sense the state of the switch cards. The switch remains in the current state when
power is interrupted, upon power up, the controller polls the status of each switch card. The Hot
swapping of hardware is allowed, the current state of the swapped card is polled upon insertion.
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
3.2.3
7/28/2004
Microwave Switches
The multi-throw switch design will be based on the use of high quality DPDT relays mounted on a
RF PCB. Each RF PCB also contains control electronics to interface with the controller. Three types
of 1 x 4 switches are available that will be packed to the same form factor. The switch shown in
Figure 2 is the input terminated switch. Non-terminated, Figure 3, and all-terminated switches are
available options. All three options will be included in the cost proposal. The most common type of
switch is input terminated. This is popular for a matrix that interfaces multiple active devices to one
measurement or transmitting system.
The switch type is latching. This provides immunity of switch state from power interruptions.
Additionally, reduced power consumption and heat dissipation is achieved.
This proposal is for SMA RF connectors. The top 4 are the inputs and the bottom is the common.
The customer may request alternate RF connectors.
Figure 2. 1 X 4 Switch with Input Termination
Aeroflex / Weinschel
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1 x 4 Multi-Channel Switch Matrix
7/28/2004
Figure 3. 1 X 4 Switch Non-terminated
3.2.4
Ethernet SNMP Specifications
The switch matrix will have a 10 Base T Ethernet Interface with an RJ45 Connector. The interface
will comply with SNMP protocol. The parameters, which will be controllable or accessible over the
control interface, will be:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Aeroflex / Weinschel
System S/N
System board S/N’s
SW Revision level
Quantity of 1x4 switch cards
Individual switch positions
Inquiry of switch position
External cable interconnects
System Fault Reports
System Address status
System address set
Download new software revision
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1 x 4 Multi-Channel Switch Matrix
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7/28/2004
Certification
The Multi-Channel 1x4 Switch Matrix can have a CE certification if required.
5
Quality Assurance
Aeroflex / Weinschel will implement its standard quality assurance program for development,
fabrication, assembly, alignment and test of the deliverable items. This program supports compliance
with the inspection requirements of ISO 9001.
6
Design Rights
Aeroflex / Weinschel will retain all proprietary rights to the Multi-Channel 1 x 4 Switch Matrix.
Aeroflex / Weinschel will assign special model number to this item at the time of order.
Aeroflex / Weinschel
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