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Products - TDM Summary Page
 
 
 

A comprehensive range of highly-featured professional TDM over IP or Ethernet converter products delivering very high quality clocked E1, T1, V.35 and X.21/V.11 services. Designed and manufactured in the UK.
 
Feature-rich Circuit Emulation Services (CES) or TDM over IP units delivering extremely accurate clocks suitable for the most demanding applications such as mobile backhaul. Products include:
  • Excellent management, diagnostic tools and statistics
  • Easy to commission and run using intuitive GUI
  • Many important features and configuration options allow the service to be "tuned" or matched to the network type and loadings
  • Multicast capabilities for broadcast and enhanced clock recovery across large networks
  • LACP for higher throughput and resilience
  • RSTP for network protection and resilience
  • Now available with MEF8 compatibility
PacketBand-TDM Product Comparison Chart
PacketBand-TDM Clocking Options
Webinar on synchronisation and its importance in large networks
New Extended Temperature range for hot climates (particularly for mobile base stations).
New dual fibre unit for resilience
New versions supporting PoE (Power over Ethernet)
Information on TDM over wireless networks
Single Port E1/T1
Low cost, high performance single port E1/T1 TDM over IP Pseudowire unit.

Single Port V.35 and X.21/V.11 over IP
Synchronised clock-locked V.35 and X.21/V.11 "leased lines" across IP and Ethernet networks.

Single port E1/T1 with single port V.35/X.21
Fitted with both an E1/T1 port and a V.35/X.21 port for CESoP TDM over IP
  

4-Port E1/T1 over IP "Leased Lines"		  
Like all PacketBands, competitively priced but highly-capable professional grade TDM over IP products. Products include:  

8 Port Resilient Chassis		  
8 E1/T1 (user switchable) clear-channel or channelised circuits over IP or Ethernet networks.  

16/32 Port Resilient Chassis		  
16 or 32 E1/T1 (user switchable) circuits over IP or Ethernet networks.  

 
Performance WARNING!  

Do not be fooled by inferior products promising "good clocks", some boast recovery to 50ppm which for most applications is useless. PacketBand can recover clocks to 15ppb, or over 3000 times better! Synchronisation and good clock recovery is the basis of this technology and is required for most applications to run or run error-free.

The type of packet network and its characteristics also play a major role in performance and application stability. Patapsco have great expertise in many types of systems and the products offer different algorithms for different types of networks.

Be careful how you test this technology. A short BERT test is not valid. Ask us for a copy of our Proof of Concept document.

  
   
What is TDM over Ethernet or TDM over IP and why is it needed?






Packet networks have no concept of clocks or synchronisation. Data is transmitted at one location and arrives at the other, at some unknown time.

You will have seen when downloading files on the public Internet that the data rate varies and the arrival of the data goes faster/slower.

This is due to loadings on the network and the number of switches the data has to go through. This is known as "jitter" or PDV "Packet Delay Variation". Jitter is far more pronounced and noticeable on the Internet compared to private networks, but the concept is the same.

Packet-based applications are designed to handle this varied and non-deterministic data arrival rate. They will also normally deal with any lost data by automatically requesting a retransmission, so the Internet looks to users as though it is error-free, which it generally is not.

All of the above works brilliantly. But, not for some applications. There are many devices around that are designed primarily to work with traditional leased lines which are point-to-point non-switched circuits - just like a dedicated wire with no jitter.

This equipment generally needs to transmit/receive data at a certain rate and maybe be synchronised with other devices so they all transmit or receive at the same rate, for example mobile phone transmitters.

In these cases, the equipment expects to have a steady, accurate clock source (not the time of day but a steady "heartbeat") with which to align its transmit and receive data.

As packet networks have no concept of clocks or clocking, this raises the requirement for PacketBand to enable TDM over IP or TDM over Ethernet services. A PacketBand can be given a reliable clock source (external or internal) which is recovered by the PacketBands at the other side of the packet network.

This means the attached TDM equipment receives the necessary steady clocks and all devices are synchronised together. The recovery and stability of these clocks, which is the whole basis and reason for using this technology, is a major strength of the PacketBand range.

In addition to the clocks, PacketBand also buffers the incoming data before it transmits to the attached device, so any slower packets will have arrived before their clock pulse. [Data only has one instant at which it must be passed to the attached device; miss its moment and it cannot be used again].

With PacketBand the TDM device sees what it believes to be a continuous steady clocked stream of traffic with no delays - just as if it was connected on a point-to-point wire or leased line.

The products are highly-functioned and benefit from Patapsco's great support.

FAQs		  
  TDM over wireless  
 
 
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