How it works?
In the event of the failure of the data server / router connected to the "A / active" port of the T1 Protection (Fail-Over) Switch, it shall automatically switch and connect the T1 line from the telephone company to the data server / router on the "B / standby" port. This ensures minimum downtime - which would have otherwise occurred due to equipment failure connected to the "A / active" port. This equipment may be used to enhance the reliability and the efficiency of the customer's data network.
Features and Highlights
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 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 framing.
|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.|
|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.|
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.
|Number of Interfaces||4 Telco T1 Links (common link/Telco T1s)
4 Active T1 Links (for Equipment-A)
4 Standby T1 Links (for Equipment-B)
|Line Rate||T1 - 1.544 Mbps|
|Line Code||B8ZS, AMI (User Selectable)|
|Frame Structure||SF, ESF (User Selectable)|
|Bit Rate||1544 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||100 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|
|Output voltage of AC Adapter||100 - 240V 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 with 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%|
|Network Interface||RJ-45 Ethernet 10BaseT or 100BaseT-TX (auto sensing)|
|Compatibility||Ethernet Version 2.0 IEEE802.3|
|Protocols Supported||ARP, UDP/IP, TCP/IP, Telnet, ICMP, SNMP, DHCP, BOOTP, TFTP, Auto IP, SMTP and HTTP|
|LEDs||10Base-T and 100Base-TX Activity, full/half duplex|
|Management||Internal web server, SNMP (read only), Serial login, Telnet login|
|Rack mounting||Standard 19-Inch. DIN Rack|
Management Ports (COM Port)
|Operating||0°C to 50°C|
|Humidity||5% to 95% Non-Condensing|
Applicaton # 1
Telco T1 Link Connected to Equipment - A
User programmable criterion for switching between Active and Standby T1 Links at the customers premises.
Applicaton # 2
Equipment - A Fails - Telco T1 automatically switches to Equipment - B
Applicaton # 3
Equipment - A recovers - Telco T1 automatically switches to Equipment - A
Data Sheet (PDF)