The VCL-SafeComm, 8 E1 Links (24 E1 Ports), 1+1 Automatic Protection
Switching (APS) Equipment may be used to protect upto 8 E1 Links (24 E1 Ports),
point-to-point links and provide an alternate communication route to each E1 Link between
any two E1 points.
In the event of the failure of the primary (Main) E1 communication route, the
VCL-SafeComm, 8 E1 Links (1+1 Automatic Protection Switching Equipment) automatically
switches the E1 traffic to a secondary (standby) E1 route. The VCL-SafeComm, 8 E1, 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 E1 routes on similar (fiber-fiber), or complementing (fiber-radio) transmission
The criterion for switching between the primary (main) and
the secondary (protected/standby) routes is user programmable.
switching between the primary (main) and the secondary (protected/standby) routes may be
Loss-Of-Signal on E1 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.
transported on the E1 Links is transparent and protocol independent.
VCL-SafeComm 1+1 Protection Switch
does not "add" a point-of-failure to the E1 network.
Even in the event that the power to the VCL-SafeComm
1+1 Protection Switch (or the equipment itself) fails, the E1 link
connectivity shall be "always" maintained." The E1 link integrity
is ALWAYS maintained (the switch reverts the connection to the
primary E1 link), even if the power to the equipment is
disconnected and removed. This ensures that the E1 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
Modes of Operation
There are three modes in which the VCL-SafeComm E1, 1+1 Automatic
Protection Switch can be configured to operate in:
AUTOMATIC SWITCHING MODE:
The VCL-SafeComm E1, 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 E1 circuits
from the MAIN route to the STANDBY route if there is an AIS or a
LOS (LOSS OF SIGNAL) alarm, on the MAIN E1 link route.
Similarly, in the automatic mode the switch shall automatically
switch back and re-route the E1 circuits from the STANDBY
route to the MAIN route upon the
restoration of the service on the MAIN E1 link route.
All switching parameters and link restoration parameters are
EXTERNAL TRIGGER SWITCHING
Sometimes the user wants to switch the E1 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 E1
route and the STANDBY E1 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 E1 circuits
between their main E1 radios and standby E1 radios.
MANUAL SWITCHING MODE:
In Manual Switching Mode, the user
shall use manual Telnet commands to
switch the E1 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.
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 between 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 STANDBY / REDUNDANT E1/T1 Radio link automatically gets
connected to provide continued connectivity and service between the BSC and the BTS.
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.
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
E1, 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 E1 is automatically switched to the
alternate route over the E1 radio, thus ensuring maximum uptime on all such 1+1 protected
Once the primary (optical fiber) E1 Link on the optical
fiber is restored, the VCL-SafeComm, 8 E1, 1+1 Automatic Protection Switching Equipment
automatically restores the communication to the primary (optical fiber) E1 Link. The
switching and restoration criterion is user programmable.
Features & Highlights
High density protection switching
equipment (upto 8 E1 Links i.e. 24 E1 Ports)
To provide an independent point-to-point,
protected E1 Link between two "E1 USER PORTS" on similar (example fiber-fiber),
or dissimilar (fiber-radio) mediums
To provide 1+1 E1 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 E1
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 E1
backhaul facility outages. When the primary (working) link fails, the E1 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 E1, 1+1 Automatic
Protection Switching Equipment the product may be used to improve network reliability and
Alternate Facility Advantages
Service Differentiation Agreements
Increased Network Reliability Resilience
Media and Path Diversity
Alarm logging and monitoring.
User Programmable 1+1 Protection Parameters:
Loss of Signal
AIS (All Ones Alarm)