Delivering E1 over IP and T1 over IP or other Packet Networks such as Ethernet, sometimes called Pseudo-Wires, TDM over IP or CESoIP, is a relatively new market which is helping Carriers, mobile operators and Users transport legacy equipment synchronous traffic over IP networks.
Many applications (typically E1 T1 devices) cannot connect to IP networks because of clocking, latency and other interface issues.
PacketBand-TDM-4G uses the latest technologies, systems and standards to deliver to the DTE equipment T1 and/or E1 full or fractional “leased lines” over a Packet Network.
[For Patapsco's unique ISDN over IP systems, see the PacketBand ISDN Application Page.]
The accuracy of clocks and clock recovery for the E1 and T1 circuits is at the very heart of these applications.
In many situations the central site has a clock source (PRC) and the remote locations have to recover the clock across the non-clocked Packet Network. In this way both "ends" are synchronised to the same clock source and the E1 and T1 services look and perform the same as traditional leased lines.
Some applications, such as mobile cellular backhaul, require the clocks to be particularly accurate for and T1 and E1 over IP services.
High accuracy clock-recovery and synchronization systems are a key strength of PacketBands, together with excellent jitter handling capabilities and robust recovery systems should there be any problem on the Packet Network.
Actual E1 over IP performance does depend on the quality of the Packet Network, butPacketBand installations have easily beaten the G.823 Synchronisation MTIE mask (and the much less stringent G.823 Traffic mask) and G.813 and even tracked the G.812 (stratum 2) mask.
Not only is the clock recovered very accurately, but the movement of the clock is very stable. On high quality networks results have been achieved where the movement is as low as 4ppb (parts per billion) but perhaps more typically 20ppb is seen.
MTIE and TDEV result for long-term stability test. Masks are G.823 Synchronous Interface requirements. More test results and comparisons with competitive products are available by registering here.
Able to deliver 1-4 T1/E1 full or fractional (structured) services, the PacketBand has a number of field-upgrade options together with Patapsco’s carrier-proven and established DBManager system which provides remote access and a network-wide view of all PacketBands and the links between them.
The products are quick and easily install, with local and remote configuration options and centralised and distributed control and visibility of the whole network. |
Unlike most TDM over IP or CESoIP equipment, PacketBand does not rely on simple hardware-based systems to manage clocks but rather uses sophisticated algorithms and software hysteresis programs. This enables the clocks to be tuned very finely and to make an “informed” decision on when and how to change clocks rather than reacting blindly – resulting in accurate and smooth clocks. PacketBand supports several of these software algorithms optimised for different network types and loading profiles, meaning the units can be tailored to individual network and profiles where the absolute best performance is needed.
The products, both hardware and software, are designed to a high standard and benefit from approvals in a number of countries including Europe, USA and Canada with testing being done by an external well-known and reputable European Accedited Test Laboratory for safety, emmissions and connectio to line.
PacketBand-TDM-4G can connect to both DTE and network, providing the ability to “break-out” into a “real” leased line environment, offering potential massive savings on international and other long-distance circuits.
The PacketBand-TDM-4C has slightly different clocking options and can offer true PDH plesiochronous clocking if needed (different clocks in each direction).
A number of configuration options are supported, including the ability to “groom” more than one remote circuit into a single circuit at the HQ or POP site, thereby reducing the number of expensive CPE ports needed on local equipment.
TDM over IP circuits can be permanently established, or on a scheduled time-of-day basis with different capacities at different times.
If you currently provide or use a Packet Network and still have or see applications for leased lines, the PacketBand range can help you.
Product Overview
- Highly-accurate clock recovery mechanisms
- Available with 1, 2 or 4 E1/T1 ports
- Support for unstructured E1 (G.703) and T1
- Support for structured E1 (G.704) and T1
- On-board Ethernet switch
- 1 Packet interface to the “WAN”
- 3 further local Ethernet ports with Rate Limiting
- Capacity available 24/7 or on a schedule
- Internal auto-sensing AC PSU
- Optional internal DC PSU
- Compact 1U table-top or rack-mountable
- Real-Time-Clock for event log
- Ability to change most parameters without affecting other ports
- Remote management with network view of all links
- Many advanced configuration options/features
- Inter-works with other PacketBands
- Support for developing standards
Unlike many other units, All PacketBands have Safety, EMC (Emissions and Immunity) and Telecoms Connectivity Approvals approvals for Europe, USA, Canada, Australia, New Zealand and other territories. PacketBand is CE marked. All testing has been done by well-respected European Accredited Approvals laboratories.
Available
on this page is the PacketBand-TDM-4G
Market Overview which
gives information on the products
and example uses. Additionally, more detailed
PacketBand Product Description is
available on-line by registering.
A number of Application
Notes are
down-loadable on the TDM
over IP Application Page and
the ISDN
over IP Application Page.
If you would like further information,
please contact
us.
|
