A2000 Network Solutions, Inc.

Engineering, Furnishing, and Installing Optimized Networks

Hot New Product

  True "Hands Off" T1/E1/DS3  Movement with Equipment Failure

T1 Automatic Protection (Fail-Over) Switch

Product Overview – T1 Protection (Fail-Over) Switch

A2000 had a failover product produced based on the needs and discussions with large end users and the importance of T1 for many diverse applications.  Standby or redundant T1’s are costly on a monthly basis, but the failover switch and another device can assure that you site has 100% redundancy past the “single” or multiple T1’s.  The product was designed to support many different technologies or applications at on time with 4 individual standalone failover ports: Internet T1, MPLS or Data T1, Voice T1, and or any T1 service out of one single platform. 

If you are running Integrated Services (voice, video, and data) or Mission Critical Internet over Multi-Link PPP or CEF enabled carrier services, this product is the only solution for absolute redundancy without compromising bandwidth and/or adding complex routing with more expensive equipment.

The 4 Port T1 Protection (Fail-Over) Switch allows the user to connect up to four T1 lines from the telephone company to "active", as well as to "standby" devices, 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 T1 Protection (Fail-Over) Switch shall automatically switch and connect the T1 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. This product enhances the efficiency of the network behind the carrier T1 services.


Allows the users to connect up to 4 T1 lines from the Telephone Company to 4 active and 4
      standby T1 devices
Ø       User configurable. May be used for a single T1 link and scaled up to 4 T1 links though user
Ø       Independent, user configurable switching parameters for each T1 link
Ø       Built-in real-time clock / real-time logging maintains a history of all events
Ø       Remotely accessible over a TCP-IP networks. Allows the user to access and carry out
      maintenance, or and T1 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 financial expense of leasing
      additional expensive T1 lines from the telephone company

Ø       Automatically switches the T1 link(s) from the Telephone Company between the "active"
      and "standby" T1 equipment at the customer premises, according to the customer-defined
Ø       Improves security; allows the user to co-locate the "backup"/" standby" equipment in a different
      room/building and prevent data loss

Ø       User programmable switching criterion independent for each T1 link
Ø       Increases the reliability of the customer data/IT networks without the recurring additional cost of
      leasing additional T1 lines from the telephone company. The equipment may be used to create
      secondary/backup systems at the customer premises to provide virtually uninterrupted service.

User Defined Failover:

User programmable criterion for switching between Active and Standby T1 Links at the customers premises:

Loss of T1 Signal (LOS) The Loss Of Signal condition in a T1 may occur due to:  The failure of the
      T1 Port of the customer premises’ equipment. Or, due to loss of power to the customer premises’
      equipment. Or, due to the disconnection of the T1 cable between the protection Switch and the T1
      Port of the customer premises’ equipment.
Ø       Loss Of Frame (LOF) This Alarm is also known as Blue Alarm. This Alarm indicates unframed all
      ones being detected in the incoming pulses on the receiver of T1 Protection Switch. The cause of
      LOF is 2 out of 5 Ft bits are in error for D4 Framing and 2 out of 5 frame bits are in error for ESF
Ø       Alarm Indication Signal (AIS). This Alarm is also known as Yellow Alarm. This Alarm indicates in
      D4 Framed bit 2 of each DS0 for 255 consecutive channels has been detected as a zero. Remote
      Alarm (RA) when ESF Framed: Alternating eight ones/eight zeros have been detected in the ESF
      Datalink. A Yellow Alarm is typically transmitted to indicate a failure on the receive side of
      the “failed” end.
Ø       CRC ERROR This parameter is the number of CRC-6 errors (Cyclic Redundancy Check Errors)
      that occurred during the test period. CRC-6 errors are only counted while the Telco T1 framing is
      selected as ESF (Extended Superframe). The CRC-6 can be monitored either on In-Service or Out-
      of-Service T1 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.

 Application Diagrams:

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