Application NoteThe DS3 Fail-Over Switch should
be used when the customer wishes to connect redundant (active and standby) DS3 equipment
(such as Routers) at the customers premises to a single DS3 service line from the
telephone company.
The DS3 Fail-Over Switch will automatically switch the DS3
service line from the telephone company between the ACTIVE DS3 data server / router and
the STANDBY DS3 data server / router. Should and whenever the ACTIVE DS3 data server /
router fail (or be removed from service), the DS3 line from the telephone company
automatically switches to the STANDBY DS3 data server / router without requiring any
customer or user intervention.
The DS3 Fail-Over Switch may also be accessed remotely by
the user to allow forced / manual switching between the two DS3 terminals through user
executable software commands using Telnet.
Features
- Allows the user to connect a DS3 line from the Telephone
Company and to switch it automatically between an active and a standby DS3 terminal at the
customer premises
- LOS (Loss of DS3 Signal) is the switching criterion between
"Active" and "Standby" DS3 Ports
- Fail-Safe switching to Main (Port A) link in to event of
equipment or power failure
- Available in a single DS3 line and a two DS3 line version
- Independent switching for each DS3 line (in the 2, DS3 line
version)
- 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 switch the DS3 line between the
"active" and "standby" DS3 terminals, remotely, if required
- Dual AC (1+1 AC) or Dual - 48V DC (1+1 DC) power input.
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 DS3 lines from the telephone company
Automatically switches the DS3 link from the Telephone
Company between the "active" and "standby" DS3 equipment at the
customer premises, according to the customer-defined 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
DS3 lines from the telephone company. The equipment may be used to create secondary /
backup systems at the customer premises to provide virtually uninterrupted service.
DS3 Switching Parameter
|
Loss of DS3 Signal (LOS) |
The Loss of Signal condition
in a DS3 may occur due to:
|
|
DS3 Switching Time |
- Change over time from
Main Link
to the Standby Link is user
configurable from 10ms to 3000ms
- Recovery
Switching time from Standby Link
to Main Link is also
user configurable from 10ms to 9999ms.
|
System Management and Access
- Windows XP and Windows 7 compatible GUI
- Telnet - CLI (Command Line Interface)
- SNMP V2 (MIB File provided with the equipment)
Monitoring and Control Port
- Serial Management Port (RS232) – COM Port
USB Serial Interface – COM Port
10/100 BaseT for remote management over a LAN / TCP/IP network
Applications
Technical
Specification
DS3 (T3) Interfaces
| Number of DS3
Interfaces Telco |
1 (in one DS3 line
version)
2 (in two DS3 line version) |
| Number of DS3
Interfaces Equipment |
2 (in one DS3 line
version)
4 (in two DS3 line version) |
| Bit rate |
44.736 Mbps |
| Bit rate tolerance |
+/- 20ppm |
| Line code |
B3ZS |
| Framing |
Transparent (M-13
and C-Bit supported) |
| Pulse shape |
Meets ANSI
T1.102-1993 and
Bellcore GR-499-CORE |
| Connectors |
BNC, Co-axial
Un-balanced |
| Impedance |
75 Ohms |
| Signal level to
declare loss of signal condition |
< 20mV |
| Signal level to
clear loss of signal condition |
> 90mV |
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 with DC input polarity protection. |
| Power Supply
Rating - Maximum full load output current |
2.5 A at 7.5 V
DC/9.0 V DC |
| Power consumption |
14 watts |
| Input voltage
reversal protection |
Provided in the
Card |
| Efficiency at full
load |
>86% |
| Feed connectors |
Dual Feed - 2 AC
Inputs |
DC
Power Supply Specifications
| Power supply |
-48V DC (-40V DC
to -60V DC) |
| Input voltage
reversal protection |
Provided in the
Card |
| Power supply |
1+1 Protected
Inputs |
| Power consumption |
14 watts |
| Feed connectors |
Dual Feed - 2 DC
Inputs |
Command
Language
- Command Line Interface
(English text commands)
System
Management and Access
- Windows XP and Windows 7
compatible GUI
- Telnet - CLI (Command Line
Interface)
- SNMP V2 (MIB File provided
with the equipment)
Monitoring
and Control Port
- Serial
Management Port (RS232) COM Port
- USB Serial
Interface COM Port
- 10/100 BaseT for remote
management over a LAN
- 10/100 BaseT Telnet over a
TCP-IP network
Ethernet
Management Port (Telnet and SNMP) Specifications:
| Network Interface |
RJ-45 Ethernet
10BaseT or 100BaseT-TX (auto sensing), MDI-X. |
| Compatibility |
Ethernet Version
2.0 IEEE802.3 |
| Protocols
Supported |
ARP, UDP/IP,
TCP/IP, Telnet, ICMP, SNMP |
| Management |
SNMP (read only),
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
|
Clock
- Synchronized to the network
DS3 clock.
Chassis
- 1U High (44 mm.)
- 19-inch rack-mounting shelf
Compliance/Regulatory
- Meets CE emission requirements
- Complies with FCC Part 68 and
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
Ordering Information
S. No. |
Product
Description |
Part No. |
1. |
Single DS3
Protection (Fail-Over Switch)
19" Shelf 1U High
Mount Version 110/120 V AC, 50/60 Hz power input |
VCL-DS3-SNG-PRO-1455-AC |
2. |
Single DS3
Protection (Fail-Over Switch)
19" Shelf 1U High Mount Version -48V DC power input |
VCL-DS3-SNG-PRO-1455-DC |
3. |
Dual DS3
Protection (Fail-Over Switch)
19" Shelf 1U High Mount Version 110/120 V AC, 50/60 Hz power input |
VCL-DS3-DUAL-PRO-1455-AC |
4. |
Dual DS3
Protection (Fail-Over Switch)
19" Shelf 1U High Mount Version -48V DC power input |
VCL-DS3-DUAL-PRO-1455-DC |
Related Links:
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