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T1 Automatic Protection (Fail-Over) Switch
Product Overview – T1
Protection (Fail-Over) Switch - 4 Links (12 T1 Ports)
 Valiant's 12 Port T1 (4 Links) Protection (Fail-Over) Switch allows
the user to connect upto four T1 lines from the telephone company to "active",
as well as to "standby" terminal(s), such as data servers / routers 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 servers / router equipment connected to "B / standby" ports. This
ensures minimum downtime -that would have otherwise occurred due to equipment failure.
Enhances the efficiency of that network.
Features:
Allows the users to connect upto 4 T1 lines from the
Telephone Company to 4 active and 4 standby T1 terminals
User configurable. May be used for a single T1 link and
scaled upto 4 T1 links though user configuration
Independent, user configurable switching parameters for each
T1 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 T1 switch the links remotely, if required.
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Benefits:
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 T1s lines from the
telephone company
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 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
T1 link
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.
Application Note: The E1/T1 Fail-Over
Switch should be used when the customer is using a single E1/T1 link to provide protection
equipment to the customers premises by using one E1/T1 ACTIVE and one E1/T1 STANDBY
equipment (such as a ROUTER or a PBX). The E1/T1 Failover Switch shall automatically
switch the E1/T1 that is being received from the telephone company between the ACTIVE
E1/T1 equipment and the STANDBY E1/T1 equipment. Should the ACTIVE E1/T1 equipment go bad
or be removed from service, the E1/T1 link from the telephone company automatically gets
switched to the STANDBY E1/T1 equipment without any customer or user intervention.
Application Note: 8/16
E1/T1 Links (24/48 E1/T1 Ports), 1+1 Automatic Protection Switching Equipment: This
equipment is to be used when the customer wants to use two different E1/T1 links of the
network to establish a 1+1 redundant path to ensure continued E1/T1 service bewteen two
points even if one of the network E1/T1 link fails. Example - the customer may want to use
E1/T1 Optical Fiber and an E1/T1 Radio link and to provide an ACTIVE and a STANDBY link
between a BSC and a BTS so that when the E1/T1 Optical Fiber (ACTIVE) link goes down the
STANBY / REDUNDANT E1/T1 Radio link automatically gets connected to provide
continued connectivity and service between the BSC and the BTS.
Applications:
- 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: a) The failure of the T1 Port of
the customer premises equipment.
b) Or due to loss of power to the customer premises
equipment.
c) Or due to the disconnection of the T1 cable between the
protection Switch and the T1 Port of the customer premises equipment.
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.
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| 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.
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| 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.
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| 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. |
Technical Specifications
Network Interface
| 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
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| Line Code |
B8ZS, AMI (User Selectable)
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| Frame Structure |
SF, ESF (User Selectable)
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| Bit Rate |
1544 Kbps ± 50 ppm
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| Jitter Tolerance |
As per ITU-T G.823
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| Output Jitter |
< 0.05 UI (in the frequency
range of 20 Hz to 100 KHz)
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| Nominal Line Impedance |
100 Ohms Balanced RJ-45
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| Nominal Pulse Width |
244 ns
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| Pulse Mask |
As per ITU (CCITT) Rec. G.703
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| Loss and recovery of frame
alignment |
As per clause 3 of ITU (CCITT)
G.732
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| Loss and recovery of multiframe
alignment |
As per clause 5.2 of ITU (CCITT)
G.732
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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% |
NMS (with Telnet) XPort Specifications
| 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 |
| EMI Compliance |
- Radiated and conducted
emissions - complies with Class B limits of EN55022:1998
- Direct and Indirect ESD - complies with EN55024:1998
- RF Electromagnetic Field Immunity - complies with EN55024:1998
- Electrical Fast Transient/Burst Immunity - complies with EN55024:1998
- Power Frequency Magnetic Field Immunity complies with EN55024:1998
- RF Common Mode Conducted Susceptibility complies with EN55024:1998 |
Mechanical Specifications
| Rack mounting |
Standard 19-Inch. DIN
Rack |
| Height |
44.00 mm |
| Depth |
260.00 mm. |
| Width |
477.00 mm. |
| Weight |
4.00 kg. |
Management Ports (COM Port)
Serial Port: 9.6Kbps (Async).
ASCII/VT100/HyperTerminal
10BaseT Ethernet: Telnet
Command Language
Command Line Interface (English text commands)
Temperature
| Operating |
00C to 500C |
| Humidity |
5% to 95% Non-Condensing |
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