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E1 Automatic Protection (Failover) Switch
Product Overview

Orion Telecom Networks Inc. offers the 12 Port (4 E1 Links) E1 Protection (Fail-Over) Switch allows the user to connect upto four E1 lines from the telephone company to "active", as well as to "standby" terminal(s), such as data server(s) etc. at the customer premises.


In the event of the failure of the data server(s) / equipment connected to the "A / active" ports, the  E1 Protection (Fail-Over) Switch shall automatically switch and connect the E1 line (s) from the telephone company to the data server(s) / equipment connected to "B / standby" ports.

This ensures minimum downtime-that would have otherwise occurred due to equipment failure.

Features and Benefits

  • Allows the users to connect upto 4 E1 lines from the Telephone Company to four active and four standby E1 terminals
  • User configurable. May be used for a single E1 link and scaled upto 4 E1 links though user configuration
  • Independent, user configurable switching parameters for each E1 link
  • Built-in real-time clock / real-time logging maintains a history of all events
  • Remotely accessible over a TCP-IP networks. Allows the user to access and carry out maintenance, or and E1 switch the links remotely, if required
  • Allows the users to create and maintain active / standby/duplicate customer premises data networks/data servers, without requiring to bear the recurring $$$ expense of leasing additional expensive E1s lines from the telephone company
  • Automatically switches the E1 link(s) from the Telephone Company between the "active" and "standby" E1 equipment at the customer premises, according to the customer-defined criterion
  • Improves security. Allows the user to co-locate the "backup"/" standby" equipment in a different room/building and prevent data loss
  • User programmable switching criterion independent for each E1 link
  • Increases the reliability of the customer data / IT networks without the recurring additional cost of leasing additional E1 lines from the telephone company. The equipment may be used to create secondary / backup systems at the customer premises to provide virtually uninterrupted service.





Loss Of E1 Signal (LOS)  The Loss of Signal condition in a E1 may occur due to:
  1. The failure of the E1 Port of the customer premises equipment.
  2. Or due to loss of power to the customer premises equipment.
  3. Or due to the disconnection of the E1 cable between the protection Switch and the E1 Port of the customer premises equipment.
Loss Of Frame (LOF)  This Alarm indicates unframed all ones being detected in the incoming pulses on the receiver of E1 Protection Switch
Alarm Indication Signal (AIS) This Alarm indicates that the E1 link error has occurred.

This parameter is the number of CRC-4 errors (Cyclic Redundancy check errors) that occurred during the test period.

The CRC-4 can be monitored either on-in-service or Out-of-Service E1 spans. Since the expected value of the CRC pattern can be anticipated, the received data can be compared to the expected results. Whenever the expected value does not equal the actual value a CRC error event is counted.

Technical Specifications

Network Interface

Number of Interfaces


4 Telco E1 Links (common link/Telco E1s)
4 Active E1 Links (for Equipment-A)
4 Standby E1 Links (for Equipment-B)
Line Rate E1 - 2.048 Mbps + 50ppm
Line Code HDB3
Frame Structure As per ITU (CCITT) G.704 or un-framed E1
Bit Rate 2048 Kbps + 50 ppm
Jitter Tolerance As per ITU-T G.823
Output Jitter < 0.05 UI (in the frequency range of 20 Hz to 100 KHz)
Nominal Line Impedance 120 Ohms Balanced RJ-45
Nominal Pulse Width 244 ns
Pulse Mask As per ITU (CCITT) Rec. G.703
Loss and recovery of frame alignment As per clause 3 of ITU (CCITT) G.732
Loss and recovery of multiframe alignment As per clause 5.2 of ITU (CCITT) G.732

AC Power Supply Specifications

Output voltage of AC Adapter

100 - 240 Volt AC

Range of input AC voltage 100 V to 240 V AC, 50Hz / 60Hz.
System Input voltage 7.5 V DC to 9.0 V DC, DC input polarity protection
Maximum full load output current 2.5 A at 7.5 V DC / 9.0 V DC
Input voltage reversal protection Provided in the Card
Efficiency at full load >86%

DC Power Supply Specifications

Input DC voltage - Dual Input

-48V DC (nominal)

Range of input voltage

-18V to -72V DC

System voltage


Input voltage reversal protection

Provided in the Card

Short circuit protection


Power Consumption

< 8W

Operations and Maintenance (OAM) Interfaces 

  • RS232 serial interface for local terminal access
  • USB serial interfaces for local terminal access
  • 10/100BaseT Ethernet Interface for remote access over an IP network.

 Management and Monitoring 

  • RS232 serial, USB serial interfaces for local terminal access.
  • 10/100BaseT Ethernet Interface for remote access over an IP network.
  • Encrypted Password Protection.
  • Telnet Remote access over IP links.
  • SSH Secured remote access using Secure Shell Protocol over IP links.
  • SNMP Traps and NMS for real time remote monitoring and management over an IP network.
  • Automatic Link Test feature link testing at user programmable periodical intervals.
  • Visual I/O status LED Display.

Mechanical Specifications

Rack mounting Standard 19-Inch. DIN Rack
Height 44.00 mm.
Depth 260.00 mm.
Width 477.00 mm.
Weight 3.5 kg.


Operating 00C to 500C
Humidity 5% to 95% Non-Condensing

Compliance / Regulatory

  • EMC FCC Part 15 Class 2
  • Operation ETS 300 019 Class 3.2
  • Storage ETS 300 019 Class 1.2
  • Transportation ETS 300 019 Class 2.3

Other Links

Technical specifications are subject to change without notice.
All brand names and trademarks are the property of their respective owners.



E1 Automatic Protection (Failover) Switch - Data Sheet (PDF)

E1 Automatic Protection (Failover) Switch  Presentation PPS (385 KB)
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::   Application Diagram  ::
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Orion Telecom Networks, Inc.
20100, N 51st Ave, Suite B240,Glendale AZ 85308
Phone: +1 480-816-8672    Fax: +1 480-816-0115
E-Mail: sales@oriontelecom.com

Web Site: http://www.oriontelecom.com