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Benefits
Allows the users to install and maintain
active/standby/duplicate customer premises data networks/data servers, without bearing the
recurring $$ expense of leasing additional expensive T1 lines from the telephone company.
Automatically switches the T1 line from the Telephone
Company between the "active" and "standby" T1 equipment at the
customer premises, according to the customer-programmed criterion.
Improves equipment and data security.
Allows the user to co-locate the "backup /
standby" equipment in a different room/building and prevent any data loss arising out
of conditions of natural calamity such as fire, flooding etc.
Increases the reliability of the customer's data/IT networks
without having to bear the recurring and 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 T1 Fail-Over Switch
should be used when the customer is using a T1 line to connect to and install
"active" T1 equipment and "standby" T1 equipment (such as a ROUTER or
a PBX) at the customers premises.
- The T1 Failover Switch shall automatically switch the T1 line from the telephone company
between the ACTIVE T1 data server / router and the STANDBY T1 data server / router. Should
the ACTIVE T1 data server / router fail or be removed from service, the T1 line from the
telephone company automatically switches to the STANDBY T1 data server / router without
requiring any customer or user intervention.
- 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:
- 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.
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. |
| 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 |
| 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 |
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
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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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