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Product Description
The VCL-SafeComm, 8 T1 Links (24 T1 Ports), 1+1 Automatic Protection
Switching (APS) Equipment may be used to protect upto 8 T1 Links (24 T1 Ports),
point-to-point links and provide an alternate communication route to each T1 Link between
any two T1 points.
In the event of the failure of the primary (Main) T1 communication route, the
VCL-SafeComm, 8 T1 Links (1+1 Automatic Protection Switching Equipment) automatically
switches the T1 traffic to a secondary (standby) T1 route. The VCL-SafeComm, 8 T1, 1+1
Automatic Protection Switching equipment is available in a 2U high chassis which may be
mounted in any DIN standard,19-Inch rack.
This product allows the user to design 1+1 (protected)
redundant T1 routes on similar (fiber-fiber), or complementing (fiber-radio) transmission
mediums.
The criterion for switching between the primary (main) and
the secondary (protected/standby) routes is user programmable.
Criterion for
switching between the primary (main) and the secondary (protected/standby) routes may be
Loss-Of-Signal on T1 links, or AIS (All-Ones AIS alarm) condition. The criterion for
switching time and recovery time between the primary (main) and the secondary
(protected/standby) routes is user programmable. Data
transported on the T1 Links is transparent and protocol independent.
VCL-SafeComm, 8 T1 Links
(24 T1 Ports), 1+1 Automatic Protection Switching Equipment - Data Sheet (.PDF)
VCL-SafeComm, 8 T1 Links
(24 T1 Ports), 1+1 Automatic Protection Switching Equipment - Power Point
Presentation
(.PPS)
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Salient Features
- VCL-SafeComm 1+1 Protection Switch
does not "add" a point-of-failure to the
T1 network.
- Even in the event that the power to the
VCL-SafeComm 1+1 Protection Switch (or the equipment
itself) fails, the T1 link connectivity shall be "always"
maintained." The T1 link integrity is ALWAYS maintained (the
switch reverts the connection to the primary T1 link), even if the
power to the equipment is disconnected and removed. This ensures
that the T1 link connectivity is never lost.
- VCL-SafeComm 1+1 Protection Switch
provides two power inputs and this allows the user to connect the
switch to two separate independent - 48V DC power sources to
minimize the chances of any power failure occurring due to power
outage.
Modes of Operation
There are three modes in which the VCL-SafeComm
T1, 1+1 Automatic Protection Switch can be
configured to operate in:
AUTOMATIC SWITCHING MODE:
- The VCL-SafeComm T1, 1+1 Automatic
Protection Switch can be configured to operate in an AUTOMATIC
SWITCHING MODE. In the automatic mode,
the switch shall automatically switch and re-route the
T1 circuits
from the MAIN route to the STANDBY route if there is an AIS or a
LOS (LOSS OF SIGNAL) alarm, on the MAIN
T1 link route.
Similarly, in the automatic mode the switch shall automatically
switch back and re-route the T1
circuits from the STANDBY route to the
MAIN route upon the restoration of the service on the MAIN
T1 link route.
All switching parameters and link restoration parameters are
user programmable.
EXTERNAL TRIGGER SWITCHING
MODE:
- Sometimes the user wants to switch the T1
circuits between the MAIN route and the
STANDBY route when some external event
occurs. In the EXTERNAL TRIGGER MODE the user can switch between
the MAIN T1 route and the STANDBY
T1 route when an
external trigger (such as an closed/opened physical
contact) is applied to the switch. This feature was added to make
it compatible with certain radios
equipment suppliers, where they apply
an external trigger to switch and re-route the
T1 circuits between their main
T1 radios and standby
T1 radios.
MANUAL SWITCHING MODE:
- In Manual Switching Mode, the user
shall use manual Telnet commands to
switch the T1 circuits between the MAIN
route and the STANDBY route, manually,
using Telnet commands. In this mode the
AUTOMATIC MODE and the EXTERNALL TRIGGER MODE are both disabled
and the manual commands over ride all other modes.
Product
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.
Product
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.
Applications
Providing 1+1 alternate paths
between any two Transmission mediums (active+standby). e.g:
- Fiber/Fiber
- Radio/Fiber
- Radio/HDSL
- Fiber/HDSL etc.
Example: The user may deploy the VCL-SafeComm, 8
T1, 1+1 Automatic Protection Switching Equipment to provide an alternate communication
route between an optical fiber link and a radio link between any two points. In the event
of the failure of the primary (optical fiber) link the T1 is automatically switched to the
alternate route over the T1 radio, thus ensuring maximum uptime on all such 1+1 protected
T1 Links.
Once the primary (optical fiber) T1 Link on the optical
fiber is restored, the VCL-SafeComm, 8 T1, 1+1 Automatic Protection Switching Equipment
automatically restores the communication to the primary (optical fiber) T1 Link. The
switching and restoration criterion is user programmable.
Applications Diagrams
Features & Highlights
- High density protection switching
equipment (upto 8 T1 Links i.e. 24 T1 Ports)
- To provide an independent point-to-point,
protected T1 Link between two "T1 USER PORTS" on similar (example fiber-fiber),
or dissimilar (fiber-radio) mediums
- To provide 1+1 T1 redundancy support to
higher order multiplexers e.g. E2, E3
- System configuration and management
interface through "CLI" text based commands
- Transport A-bis Interface on redundant T1
links
- Provide 1+1 Protection Routing / Path
between BSC and BTS
- These ensure that mission critical voice,
data, control and management traffic are properly supported and maintained even during T1
backhaul facility outages. When the primary (working) link fails, the T1 traffic is
automatically switched to the standby (secondary) link to ensure maximum uptime
- Through the comprehensive remote
configuration and alarm management capabilities of the VCL-SafeComm, 8 T1, 1+1 Automatic
Protection Switching Equipment the product may be used to improve network reliability and
control
- Traffic Protection
- Alternate Facility Advantages
- Service Differentiation Agreements
- Increased Network Reliability Resilience
- Media and Path Diversity
- Remote Management
- Alarm logging and monitoring.
Salient Feature
Benefits
Customer Relations
Competitive
Service Level
Back-haul Network
Technology Migration
User Programmable 1+1 Protection Parameters:
- Loss of Signal
- AIS (All Ones Alarm)
Technical
Specifications
T1 Interface
Number of
Interfaces |
Total 24 T1
interfaces
8 for Main T1 Links.
8 for Primary T1 Links.
8 for Secondary T1 Links. |
| Line Rate |
T1 – 1.544 Mbps |
| Line Code |
B8ZS, AMI (automatic selection) |
| Frame Structure |
SF, ESF (automatic selection) |
| 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) |
| Pulse Mask |
As per ITU (CCITT) Rec. G.703 |
| Conformity (electrical) |
G.703 |
| Nominal Impedance |
100 Ohms, balanced |
Clock
- Transparent between the two points of the T1 Links.
Management and Control
Serial Management Port (RS232) - COM Port
10/100 BaseT for Remote Management over a LAN
10/100 BaseT Telnet over a TCP-IP Network
Specification
and Regulation Compliance
Meets CE requirements
Complies with FCC, Part 68 and Part 15 subpart A
specifications
Safety - UL 1459 Issue 2
Command
Language
- Command Line Interface (English text commands)
Alarm Contact Closures
- 1 Alarm Relay
- Type - Form "C" relay
Temperature
- Operating 00C to 500C
- Humidity 5% to 95% non-condensing
Dimensions
and Weight
| Rack mounting |
Standard 19-Inch. DIN Rack |
| Height |
44.00 mm. |
| Depth |
260.00 mm. |
| Width |
477.00 mm. |
| Weight |
4.00 kg. |
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% |
DC Power Supply Specifications
| Input DC voltage |
- 48V DC (nominal) |
| Range of input voltage |
- 40V to - 60V DC |
| System voltage |
+ 3.3V |
| Input voltage reversal protection
|
Provided in the Card |
| Short circuit protection |
Provided |
| Power Consumption |
< 10W |
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