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MIL-1240LX/MIL-1240SX
1000BASE to 1000BASE
Redundant T ransceiver
RX TX
Main Port
1000BASE-SX to 1000BASE-LX
Selector
Primary Port
TX RX TX RX
SC Connector
MIL•1240LX
Gigabit Ethernet
Redundant Transceiver
Backup Port
SC Connector
PWR2
5 VDC
1.5 A
PWR1
PWR2
MSD
PSD
SSD
PWR1
5 VDC
1.5 A
Installation Guide
This guide includes the following information:
“Introduction” on page 2
“Installation” on page 2
“Indicators” on page 3
“Theory of Operation” on page 3
RX TX
Main Port
MIL•1240SX
Gigabit Ethernet
1000BASE-SX to 1000BASE-SX
Redundant Transceiver
Selector
Primary Port
TX RX TX RX
Backup Port
SC ConnectorSC Connector
PWR2
5 VDC
1.5 A
PWR1
PWR2
MSD
PSD
SSD
PWR1
5 VDC
1.5 A
“Specifications” on page 4
“Legal” on page 6
Doc #: 90000092 Rev. B
Page 2
Install Guide
About this Manual
This guide covers both the MIL-1240LX and the MIL-1240SX. The terms “MIL1240” and “transceiver” are used throughout this document to describe either
unit.
Introduction
The MIL-1240 series of transceivers are 1000BASE, fault-tolerant transceivers that
provide redundant path for a critical gigabit Ethernet devices (e.g., a file server).
The difference in the models is:
• MIL-1240LX is a short-wave optic signals to long-wave optic signals
transceiver
• MIL-1240SX is a short-wave optic signals to short-wave optic signals
transceiver
There are three ports on the transceiver:
• Main Port
• Primary Port
• Backup Port
Typically, the
Primary
Main Port
Port
and
connects to a critical gigabit Ethernet device. The
Backup Port
connect to two ports on the same switch or
two ports on two different switches.
Features
• MIL-1240LX: One pair of multi-mode, short-wave transceivers using an SC
connector and two pair of single-mode, long-wave transceiver using SC
connectors
• MIL-1240SX: Three pair of multi-mode, short-wave transceivers using SC
connectors
• Primary and backup power supplies capable, but ships with the primary
power supply only
Installation
1. Connect an SC-type cable to the
2. Connect the other end to the appropriate device.
3. Connect
Primary
multi-mode 62.5/125mm fiber optic cables.
4. Connect a power cable to PWR1
Model: MIL-1240LX/MIL-1240SX Transceivers 2
Port and
Main
Port of the MIL-1240.
Backup Port to the appropriate devices. Use
. A second, optional power supply may be
Page 3
Install Guide
connected to the back-up power jack (
5. Supply power to the converter and make sure the
PWR2 ) to offer redundant power.
PWR1 (and
PWR2 if
applicable) LED(s) illuminates.
6. Check the LEDs for proper status. This depends on the status of the devices
connected to the different ports.
Contact Digi’s technical support if you experience difficulties installing a MIL-
1240.
Indicators
There are 5 LEDs on the MIL-1240. All LEDs are yellow, except for the PWR LED,
which is green.
• PWR1
(Power One): This lights when the MIL-1240 is receiving power on the
primary power adapter.
• PWR2
(Power Two): This lights when the unit is receiving power on the back-
up power adapter.
MSD (Main port Signal Detect): This lights when the device detects activity on
•
the Main Port
.
• PSD (Primary port Signal Detect): This lights when the device detects an input
signal on the Primary Port
.
• SSD (Secondary port Signal Detect): This lights when the device detects
activity on the Backup Port
.
When PSD and MSD illuminate at the same time, the node attached to the Primary
will connect to the node attached to the
Port
Backup Port .
Theory of Operation
The MIL-1240 consist of a fiber transceiver in the Main Port that converts
sequential nibbles on the Main
The two transceivers on the
detect pin. If the Main Port
transceiver on the Primary Port
Port to serial bits for transmission on the media.
Primary Port and
Backup Port have a signal
selects the Primary Port , this means the
detects a signal.
If the Main Port does not detect link, no signal will be transmitted on the
or
Primary
Primary
.
Port
Backup Ports . Conversely, if a link signal is not detected on the
and the Backup Ports , no signal will be transmitted on the Main
Model: MIL-1240LX/MIL-1240SX Transceivers 3
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Install Guide
Server
Switch
RX TX
Main Port
MIL•1240LX
Gigabit Ethernet
1000BASE-SX to 1000BASE-LX
Redundant Transceiver
Selector
Primary Port
TX RX TX RX
Backup Port
PWR1
PWR2
5 VDC
5 VDC
1.5 A
1.5 A
PWR1
PWR2
MSD
PSD
SSD
Figure 1.MIL-1240 Connections
Specifications
Specification for Single-Mode
• Connector type: SC
• Wavelength: 1270-1355 nm
• Cable specification: 8/125 µ m in
3 km cable
Switch
• Min. optical power output: -13.0 dBm
• Max. optical power output: -3.0 dBm
• Receive optical: Min. Max.
sensitivity -3 -20
• Return loss -12dB
• Supports up to 3 km of single-mode cable
Specification for Multi-Mode
• Connector type: SC
• Wavelength: 830-860 nm
• Cable specification: 125 µ m with
550 m links and
62.5/125 µ
m in
300 m links
• Min. optical power output: -10.0 dBm
• Max. optical power output: -4.0 dBm
• Transmitter jitter 195 ps
Model: MIL-1240LX/MIL-1240SX Transceivers 4
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Install Guide
• Receive optic characteristics: typ. max.
• Supports up to 550 m of multi-mode cable
Sensitivity/input optic. power min. -18.5 -17
Maximum input optical power 0 0
Return loss -12 dB
Receiver jitter 300 ps
Dimensions:
4.0” x 3.5” x 1”
SC Connectors
Figure 2. SC- type Connector (Rear View)
Operating Conditions
Table 1: Recommended Operation Conditions
Parameters Minimum Maximum
Operating Temperature +5° C +50° C
Humidity: Non-condensing 10 % 95 %
Signal Output Load 35 ohm 7 5 ohm
Supply Voltage 4.75 V 5.25 V
Ambient Operation 0 70
Power Supply
External power is required, with the output of 5VDC @ 1.5 amp. The system
board draws 900 mA at normal operation in room temperature of 25° C.
– An 110 VAC wall mount for domestic use
– A 220 VAC with IEC socket for international use
Model: MIL-1240LX/MIL-1240SX Transceivers 5
Page 6
Legal
Regulatory Approvals
• FCC Class A
• UL 1950
• CSA 22 No. 950
• EN60950
• CE
– EN55022 Class B
– EN50082-1
Canadian EMI Notice
This Class A digital apparatus meets all the requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la classe A respecte toutes les exigences du Règlement sur le matériel
brouilleur du Canada.
European Notice
Products with the CE Marking comply with both the EMC Directive (89/336/EEC) and the Low Voltage
Directive (73/23/EEC) issued by the commission of the European Community. Compliance with these
directives implies conformity to the following European Norms:
• EN55022 (CISPR 22) - Radio Frequency Interference
• EN50082-1 (IEC801-2, IEC801-3, IEC801-4) - Electromagnetic Immunity
• EN60950 (IEC950) - Product Safety
Digi International warrants to the original consumer or purchaser that each of its
products, and all components thereof, will be free from defects in material and/or
workmanship for a period of five years from the original factory shipment date. Any
warranty hereunder is extended to the original consumer or purchaser and is not
assignable.
Digi makes no express or implied warranties including, but not limited to, any implied
warranty of merchantability or fitness for a particular purpose, except as expressly set
forth in this warranty. In no event shall Digi be liable for incidental or consequential
damages, costs, or expenses arising out of or in connection with the performance of the
product delivered hereunder. Digi will in no case cover damages arising out of the
product being used in a negligent fashion or manner.
To Contact Digi
For prompt response when calling for service information, have the following information ready:
• Product serial number and rev.
• Date of purchase
• Vendor or place of purchase
Reach Digi Technical Support at 408/744-2751
Or E-mail at “sun-tech@dgii.com”
Address: 1299 Orleans Drive
Sunnyvale, CA 94089
Voice: 408/744-2775
Fax: 408/744-2793
E-mail: info@dgii.com
Five-Year Limited Warranty
Doc #: 90000092 Rev. B
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