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Backup E1/T1 leased lines via IP/Ethernet
Patapsco have used our many years experience in developing both backup products and IP products, combining these skills into a fast and robust system which delivers a replacement leased line via IP or Ethernet.
The DataBand "BU-IP" monitors one or two leased lines and should one fail (there are a number of ways of monitoring failure including exceeding an error threshold over a configured period of time) it will very quickly establish a backup service across an appropriate packet network. |
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Clocks are recovered very accurately across the packet network so synchronisation is maintained.
The failed circuit is monitored for recovery (running error-free for a configured period of time) and the DataBand will then either switch-back to the primary route automatically or on user instruction. |
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The DbManager offers a network-wide view of all DataBands and circuits, together with their status.
[ The original DataBand ISDN backup products have not yet been migrated to this new web site but they can be seen here.]
This product has not yet been released but a draft brochure is available in the panel on the right.
Looking for backup of leased lines by another leased line? See the DataBand "BU+1E"
For further information and details on availability, please contact us.
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| Features |
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Provides backup for one or two
leased lines |
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Sophisticated line failure detection |
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Fast switch-over to packet network
for alternate TDM route |
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Monitoring of primary circuit for
error-free recovery |
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Automatic or manual switch-back
on recovery |
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“Point-to-point” or “ring” |
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Power failure relay protection |
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BERT test |
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Automatic scheduled or manual
testing of backup circuit |
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Link status reported to DbManager |
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DbManager provides full view of
status of all circuits |
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E1/T1 |
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Channelised or clear-channel |
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Support for Fractional circuits |
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Timeslot manipulation |
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AC or DC PSU options (internal) |
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Clocking hierarchy |
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Easy and intuitive to configure via
GUI management package |
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Approved (Telecoms, Emissions,
Safety) |
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RoHS compliant |
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| Overview |
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DataBand “BU-IP” (BackUp-IP) is designed to provide fast backup for one or two E1 or
T1 circuits using widely available and low-cost packet networks as the backup medium.
Each circuit is treated independently of the other.
DataBand interfaces to the application’s hardware and to the primary WAN link,
typically a leased line. IP or Ethernet access with appropriate capacity and performance
is provided for backup. DataBand switches to the backup packet network in the event of
a failure or customer-set error thresholds being exceeded for a configured period of
time.
The packet network can be tested automatically and periodically via a schedule, or as
needed via manual intervention. This is non-disruptive to the primary link and provides a
high level of confidence that the backup service will be available when really needed.
Once on backup DataBand monitors the failed circuit for full-duplex error-free recovery
and then either switches back to this route automatically, or notifies the DbManager and
awaits a manual switch-back instruction from the operator.
DbManager is a high-quality intuitive GUI that connects to and manages/monitors
DataBand “BU-IP”; several versions are available in addition to the free DbLite supplied.
All Patapsco products are designed and manufactured to the highest standards and all
are independently approved by European test houses.
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Above diagram illustrates an example application using a leased line as the primary
circuit which is backed up by a packet network. |
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2. Operation |
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2.1 Line Monitoring |
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When running on a G.704 channelised leased line DataBand has the ability to use a
spare timeslot for monitoring of the circuit for errors using a BERT (Bit Error Rate Test) as
well as for complete failure. The detection system is capable of also identifying loops on
the circuit and will take backup action under these circumstances as well.
The customer configures how many errors in a given number of seconds warrants
backup action (0.5 to 10 seconds).
If there is no possibility of using a spare timeslot (G.703 mode for example) the usual
leased line failure alarms are used to trigger the backup and again these must be in
place for a user-configured period. These are user-selectable between LOS, AIS & RAI. |
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DataBand BU-IP can support one or two circuits for separate or
simultaneous backup |
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2.2 Switch-Over |
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Upon hitting the failure DataBand “BU-IP” immediately establishes
an appropriate circuit across the packet network and reroutes the
traffic from the primary route to the backup service. In the case of
G.704 circuits the data can be presented on, or moved to, any
timeslot on the backup circuit.
Switch-over takes no more than 2.5msecs (plus any network
latency/jitter)
DataBand BU-IP has systems to identify half duplex failures,
ensuring both ends of the link recognise and instigate backup
during a circuit failure or degradation.
Packet network capacity is only used when the backup is required
(or if scheduled testing is configured). |
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2.3 Clocks across the Packet Network |
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When in backup it is possible for one end or both to have lost their
clock sources. Maintaining synchronisation between the two ends
and across the packet network is of paramount importance, so
even if one end still has a clock the other needs to be locked to it.
DataBand has a number of clocking options and hierarchies and is
able to recover clocks across the packet network to a very high
level of accuracy ensuring synchronisation and no clock or data
slips.
Further information on clock recovery can be found on the
DataBand’s related products, the PacketBand-TDM range. |
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2.4 Recovery |
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When in backup the two DataBand BU-IP devices attempt to
establish full duplex communications over the original circuit. Once
the primary circuit has been tested and verified as error free for a
user defined period, the DataBand system will instigate the switch
back operation. The switch back system is designed to ensure a
clean and rapid return to the primary circuit with no “ping-pong”
between the two routes.
Facilities exist prevent switch back until the user authorises the
move. |
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The above is an example of a ring network which is designed to
provide resilience but with added backup via a packet network. In
this illustration both circuits to the remote TETRA site have failed and
backup is via the packet network. |
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Backup here is via an IP-based satellite. This diagram also shows
the remote site’s clock is recovered across the packet network from
the central site, retaining synchronisation. |
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3. Ports, inter-connectivity and routing |
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3.1 Ports, Channels and Groups |
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DataBand “BU-IP” supports one or two independent backups of
E1/T1 G.703/4 circuits.
Ports are user-configured between structured (G.704) and
unstructured (G.703). When using structured the timeslot to be used
for monitoring is user configured.
The link between the customer equipment and the primary route is
power-failure relay protected so if power is lost to DataBand the
leased line is directly connected to the application via a metallic
path. |
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3.2 Cross-Connection |
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When in channelised G.704 mode, timeslots used on the primary
route can be routed to different timeslots on the backup link. |
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4. General |
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4.1 Clocking |
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Software-selectable clock source, using any interface or high-quality
Internal Clock.
Auto-switchover to secondary/tertiary clocks on clock loss. Internal
clock accurate to +/- 0.15ppm.
Clocks can, if required, be recovered across the packet network
ensuring synchronisation is maintained. |
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4.2 Real-Time Clock |
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Internal battery-backed real-time clock for Event Log time-stamps
and debugging purposes. |
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4.3 Events |
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Up to 5000 Events are held within the DataBand in NV RAM on a
FIFO basis
Events can be reported automatically to the locally-attached
DbManager or across the LAN.
DbManager can also access the logs and download them when
required. DbManager writes all Events and Alarms to a flat .csv file
in real-time and this file can be manipulated by external tools to
format and extract information. |
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4.4 Diagnostics |
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DataBand provides excellent diagnostic and debug tools with
visibility of all routing decisions taken across the unit and all
messages from attached devices.
Loops can be set in both directions. |
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4.5 Approvals |
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The DataBand “BU-IP” benefits from a wide range of approvals for
connection to leased lines. All Patapsco equipment is RoHS
compliant. |
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4.7 Configuration |
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Held in non-volatile FLASH memory (retained during power-off )
and downloadable to/from the DbManager. Configuration files
can be saved to a file on a PC. |
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4.8 Software |
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New versions of software can be remotely uploaded to DataBand
via the DbManager. This is loaded to an off-line sector of FLASH
and a confirmation check-sum given. The operator can switch
software banks or revert to the original software at any time. If the
DataBand is unable to run from the new software, it will revert to
the original. |
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5. Specification |
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5.1 Interfaces |
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• 5.1.1 E1/T1 – 2 or optionally 4 TDM ports.
Marked as ‘PRI21’ ‘PRI22’ ‘PRI23’and ‘PRI24’
By default PRI21 and PRI23 are configured to be DTE (connect
to leased lines); PRI22 and PRI24 as DCE (connect to CPE)
The default configurations can be changed by the user but
crossed cables are necessary
Interfaces PRI21 - PRI22 and PRI23 – PRI24 are protected
against power failure by relays which provide a metallic path in
the event of failure.
E1
RJ45 user-switchable between:
120Ohm balanced
75Ohm unbalanced (requires converter cable)
G.703 unstructured
G.704 HDB3 encoded
Auto-detect CRC4 or non- CRC4 framing
(Multiframe or Doubleframe)
Support of non-switched E1 and Fractional E1 services
T1
RJ45 100Ohm balanced
ESF or D4 Framing selectable
B8ZS or AMI Line code selectable
• 5.1.2 Ethernet Port
1 x RJ45 UTP
10/100/1GE
Auto-sensing or manual
Single MAC and IP address, Default Gateway and SubNet
Mask, support for DHCP. Disordered packets are reordered
automatically
TDM packets can be assigned IP Diffserv (DSCP) or ToS and
802.1p CoS values and 802.1Q VLAN facilities
• 5.1.2 Control Ports
RJ11 Marked ‘Cmd’
Asynchronous 8 data, 1 stop bit no parity 19.2kbps to
115kbps (auto-detect)
Password protected
Dry contact alarm relay
Ethernet RJ45 Marked ‘LAN’ 10baseT or 100baseT or 1GE
Password protected |
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5.2 Relays |
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Interfaces PRI21 - PRI22 and PRI23 – PRI24 are Power-Failure
Relay protected and will be connected together in the event of
power failure. This forms a metallic path between the two ports |
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5.3 Power |
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1. Mains AC
Internal high-quality switch-mode supply IEC connector
Voltage range 95-240VAC auto-sensing
Input frequency 47-63Hz
Max current consumption 200mA @ 230VAC
2. Power – DC
Internal -48VDC nominal
-33VDC to -75VDC
0.35A max
4mm Terminal Block
MTBF – 1,790,000 hrs
3. Power - DC
Internal -24VDC nominal
-18VDC to -75VDC
0.55A max
4mm Terminal Block
MTBF – 800,000 hrs |
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5.5 Environment |
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Operating 0–55 °C
Humidity 10-90% non-condensing
Natural convection cooling |
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5.6 Physical |
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225mm wide x 200mm deep x 44mm high
Metal chassis, front and rear panels
Weight is 0.9Kgs 2lb
Optional 19’ rack-mounting kit |
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5.7 Maintenance |
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There are no serviceable parts or maintenance required.
The battery used for the real-time clock and some NV RAM
elements has a 7 year (typical) life-time. |
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5.8 Approvals |
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All approvals completed in UK
Accredited laboratory - reports available
1. Telecoms
TBR12/TBR13
TBR4:1995, 1997 Amendment
TIA/E1A-IS/968
TNA117
AS-ACIF-S006/S016
CS-03 Canada
TIA-968-A USA
2. Safety
IEC60950-1:2007
ACS/NZS60950:2000
AS/NZS3260:1993
ACA TS001:1997
3. EMC
EN55022:2006
EN55024:2001
A12001
EN61000-3-
2/3:1995
AS/NZS
CISPR22:2000 |
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