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 mediums.
The criterion for switching between
the primary (main) and the secondary (protected/standby) routes is
Criterion for 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 (10ms to
E1 recovery switching time from Standby Link to Main Link is also
user programmable from 10ms to 9999ms. Data transported on the E1
Links is transparent and protocol independent.
Download Data Sheet of SafeComm, 8 E1 Links (24 E1 Ports)
(PDF 326 KB)
Protection Switch does not "add" a point-of-failure to the E1
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.
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 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 MODE:
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 EXTERNAL TRIGGER MODE are both disabled
and the manual commands over ride all other modes.
Providing 1+1 alternate paths
between any two Transmission mediums (active+standby). e.g:
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
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 dis-similar
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 and GUI (Graphical User Interface)
Interface on redundant E1 links
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
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 control
Media and Path
Alarm logging and
and Password Features
System Access, Control and Management Options
CLI Control Interface (HyperTerminal or
SNMP V2 Traps (MIB File provided)
Windows based GUI (Graphical User
Interface) for easy configuration, management and access. Ability to
monitor multiple units from a single NMS.
Operation and Management Ports
RS232 Serial Port
USB COM Port
10/100BaseT Ethernet for
Security and Protection
Secured Access via SSH V2
Password Protection: Password Protection
in compliance with the mandatory clauses of the GR-815-CORE-2
specifications for secured access control.
Logging: Maintains a log of all
successful and un-successful attempts.
Logged information includes the ID and
the IP address of the accessing entities.
Alerts the administrator if the
un-successful logging attempts exceed three.
Security Audit: All access logs for up
to 30 days are maintained for security audit purposes.
Security log entry of any request or
activity including that user-ID (including IP address, if
applicable), to establish user accountability
Report Generation / Audit Trail
Management and Monitoring
RS232 serial, USB serial interfaces for
local terminal access.
10/100BaseT Ethernet Interface for
remote access over an IP network.
Encrypted Password Protection.
Telnet – Remote access over IP links.
SSH – Secured remote access using Secure
Shell Protocol over IP links.
SNMP Traps and NMS for real time remote
monitoring and management over an IP network.
Automatic Link Test feature link testing
at user programmable periodical intervals.
Visual I/O status LED Display.