8 T1 Links (24 T1 Ports) (1+1
Automatic Protection Switch)
Orion Telecom Networks Inc. offers 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
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 (10ms to
T1 recovery switching time from Standby Link to Main Link is also
user programmable from 10ms to 9999ms. Data transported on the T1
Links is transparent and protocol independent.
- VCL-SafeComm 1+1 Protection Switch
does not "add" a point-of-failure to the T1
- 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
- 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
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
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
EXTERNAL TRIGGER SWITCHING
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
MANUAL SWITCHING MODE:
Providing 1+1 alternate paths
between any two Transmission mediums (active+standby). e.g:
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 EXTERNAL TRIGGER MODE are both
disabled and the manual commands over
ride all other modes.
- Fiber/HDSL etc.
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
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.
- 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 dis-similar
- 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 and GUI (Graphical User Interface)
- 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
- 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
- Increased Network
- Media and Path
- Remote Management
- Alarm logging and
- Customer Relations
- Service Level
- Back-haul Network
- Technology Migration
- User Programmable 1+1 Protection
- Loss of Signal
- AIS (All Ones Alarm)
and Password Features
System Access, Control and Management Options:
CLI Control Interface
(HyperTerminal or VT100)
SNMP V2 Traps (MIB File
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 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.
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
Management and Monitoring
RS232 serial, USB serial
interfaces for local terminal access.
Interface for remote access over an IP network.
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