Data Phone Network - Solutions & Applications

Data Phone Network - Solutions & Applications

Welcome on Damery blog

DAMERY, active in the area of Docsis systems since 25 years, developped a set of innovative products which are the lego to build tripleplay solutions and specific data transmission and processing applications.

You will find in this blog the presentation of these solutions and applications bundled under the name
Daphne SA for « Data, phone, network solutions & applications »

Cable Internet Services via DOCSIS SYSTEMS

Cable InternetPosted by ERMURAT 2015-04-13 22:32:31


What are the main advantages of using docsis cable modem service?

First and foremost, the main advantage is the speed. With bi-directional access (two ways) the customer is receiving speeds up to 25 Mbps and transmitting (sending) at speeds up to 20 Mbps. Also, a bi-directional cable modem has a constant connection to the Internet.

What's required for Internet cable on the provider side?

At the “Head End” you will need, a broadband Internet connection, such as DSL or cable, T1 or wireless. In most cases you will need an "always on" type of connection with a bandwidth of at least 50 Mbps on both upload and download you will need an Ethernet router connected to, the broadband connection. LAN side of the router you need to connect a CMTS and a provisioning server. You will connect your CMTS to your cable network.

The Network need to use two ways amplifiers and will be ended by the distribution taps at the end of the network. The subscriber access point will be connected to one output of the nearest TAP.

At the user side juste a cable modem is needed to access internet services and an EMTA if in addition VOIP services are needed.

What Damery offers you for Internet cable systems?

DAMERY SA is able to offer the globale solution for Cable Internet including, CMTS, Cable modems, Provisioning & Monitoring software and support services to install, make work and maintain the system. Damery offer is focused on the small and middle sized networks and compliant with the latest Docsis specifications.

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How DOCSIS systems work?

DOCSISPosted by ERMURAT 2015-04-13 21:36:27

How DOCSIS systems work?

The term DOCSIS, itself an acronym for Data Over Cable Service Interface Since its initial release in 1997, DOCSIS has been better known as the technology behind cable broadband services offering transparent IP traffic between the Ethernet interface and user interface.

Different variants of the DOCSIS standard are used by different broadband providers, which may confuse some consumers and put some on quest to understand their broadband options better.

There are three different levels of DOCSIS specifications, 1.x, 2.x, and 3.x, each one tends to improve performance and/or offer additional features over the last. This means that 3.x tends to be a better standard than 2.x, which in turn is generally better than 1.x.

There are a few exceptions to this, and of course a working definition of ‘better’ would probably be helpful. Some areas serviced by second-tier cable companies still use older DOCSIS 1.x systems, but most top-tier providers using 3.x, but tend to charge more money for greater performance.

For the purposes of fostering a productive discussion on the subject, greater features and performance will generally be considered ‘better’ than great value. After all, prices for the same level of service tend to fall over time and thus value is relative and highly dependent upon time.

The DOCSIS specification can be broken down into at least two layers, the physical layer (PHY) and the media access control (MAC) layer

DOCSIS Physical Layer

The physical layer is the easiest to understand as it refers to things that people can see and touch, in this case wiring and routing equipment. The physical layer also specifies of the frequency at which data is transmitted over the wires of a cable modem system and DOCSIS-compliant network. The faster the transmission speeds, the greater the performance tends to be, but there are limitations on distance. Limitations on distance restrict the areas in which DOCSIS-based cable modem services can be deployed their speed, and their pricing.


The MAC layer is used to handle the massive packet switching requirements of a cable network and ensure that there are fewer traffic jams caused by signals collision.

In effect, the MAC layer is something of a traffic-cop that helps maximize the performance of a network. Not all MAC layers are created equal, however, and understanding how MAC affects a major network is important.

There are dozens, perhaps hundreds of homes within a housing sub-division that are serviced by dedicated DOCSIS networking hardware provided by the broadband service provider

Think of the problem faced by network architects this way: imagine data on a DOCSIS network transmitted by each user at the same time on the same frequency channel.

Nobody can receive the data correctly as there is a mix up of the signals. The only way to avoid this chaos is the transmitter of the modems to obey to certain rules to transmit, and they do not always work 100% of the time.

There is no guarantee that only a single sub-division is serviced by one terminal, but for the purposes of simplification, the example should suffice. Each device has its own specific address and name, referred to as an IP address and MAC address respectively.

The MAC address is used for intra-network signal timing rather than actual data transmission and reception. The central DOCSIS manager called CMTS will make rules in order to allow the transmission from one user at a time using the MAC address and a centralized timing system.

CMTS is the hard and brain of the DOCSIS System.

Understanding the Different DOCSIS Specifications

The original DOCSIS 1.0 standard offered support for a single channel, a trend that continued up until the introduction of the most recent DOCSIS standard, DOCSIS 3.0. The differences between DOCSIS 1.0 and 1.1 are mostly academic, and relate to the number of consumers that can be serviced and their range from hardware operated by a cable provider. The official throughput for DOCSIS 1.x systems was limited to a usable 38 Mbps downstream and approximately 9 Mbps of upstream. These rates are shared amongst multiple consumers in most cases, and are practical. Some hosts provide higher specs, specifically 42.88 Mbps downstream and 10.24 Mbps upstream, but these fail to calculate network overhead and are not necessarily honest figures.

As competition with DSL and other forms of broadband services, a new standard was needed to deliver greater speeds to a greater number of consumers who were believed to be using upstream and/or downstream numbers as a guide to making purchasing decisions.

A standard that offered substantially higher bandwidth and that standard became known as DOCSIS 2.0 and eventually DOCSIS 2.0 + IPv6. DOCSIS 2.0 actually kept the already impressive downstream speeds, but tripled the upstream performance to 27 Mbps. The logic behind this decision was simple: take a 100 customer region as an example. How many of these consumers are downloading at full-speed at any given moment? If individual download speeds are capped at 9 Mbps, then 4 could be using every last iota of network performance. Of course, what are the chances that consumers or businesses could even find something that would tax 9 Mbps of downstream for any sustained duration?

It quickly became apparent that usage patterns pointed out that downstream speeds were already sufficient, but more customers could be serviced by increasing upstream speeds; the disparity between DOCSIS 1.x’s 38 Mbps downstream and 9 Mbps upstream was too great, but DOCSIS 2.x’s ratio of 38/27 Mbps was more desirable. Of course, the advances made by DSL providers and fiber optics would eventually cause the birth of DOCSIS 3.0.

What makes DOCSIS 3.0 different from its predecessors is that it is able to support multiple channels and bind them together to increase performance. More channels means greater speed, and there is a 4-channel minimum requirement for DOCSIS 3.0 approved hardware. Each channel offers a familiar 38 Mbps downstream and 27 Mbps upstream, but there are no limits to how many channels can be used. This opens up a lot of performance possibilities, a great example of which is the 100 Mbps DOCSIS 3.x service available from most ISP to the business customers, in selected areas.

Of course, a DOCSIS 3.0 cable modem with 4 channel support is theoretically capable of downstreams greater than 100 Mbps, but it is only a matter of time until faster services are deployed that will be capable of utilizing more channels effectively. Customers would do well to match the right DOCSIS 3.0 cable modem to the appropriate service, or risk paying for a broadband service that they are not fully capable of utilizing.

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VoIP Systems

VOIPPosted by DAMERY 2015-03-24 10:25:03

Make & receive telephone calls over the Internet using "Voice over Internet" Protocol

VoIP (Voice over IP) enables you to make cheap telephone calls over a broadband cable Internet connection, or DSL, or T1.

You can connect to regular telephone numbers locally or anywhere else in the world, by using a VoIP service from an "Interconnected VoIP Provider",

In addition, you will usually have low international phone call rates to other countries. The savings can be substantial, with lower fees and taxes levied by traditional telephone carriers. Plus, most VoIP providers offer services with "unlimited" calling plans and an array of features all for one monthly fee.

A requirement for a VoIP connection is a high speed internet connection, without packet loss and jitter.

How does VoIP work?

1. Analog to digital conversion:

Voice is converted by an “IP phone” or an “EMTA” or an “ATA” (Analog Telephone Adapter) from an analog signal to a digital signal.

2. Digital data transmission :

It is then sent over the Internet in data packets to a location that will be close to the destination using Docsis CMTS and Soft- Switch.

3. Digital to Analog conversion :

Then it will be converted back to an analog signal for the remaining distance over a traditional circuit switch (PSTN) (unless it is VoIP to VoIP). Your call can be received by traditional telephones worldwide, as well as other VoIP users.

VoIP to VoIP calls can travel entirely over the Internet. Since your voice is changed to digital (so that it can travel over the Internet), other great features such as voice messages to email, call forwarding, logs of incoming and outgoing calls, caller ID, etc., can be included in your basic calling plan all for one low price. Many of these special features are great for the small business person who relies on their phone service to be more an information center rather than just a telephone.

For more info Contact us

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True Bandwidth usage

Provisioning & MonitoringPosted by DAMERY 2015-01-29 15:12:44
Damery “true-bandwidth usage analyzer" is making possible the tiered pricing
which is a winning model for consumers

"True, Simple, Fair" : Three words summarizing

The bandwidth usage analyzer from DAMERY allows you the possibility to monitor true subscriber bandwidth usage, establish the right and neutral bandwidth management policies that will reduce costs while providing opportunities for increased revenue.
The analyzer uses IPDR (Internet Protocol Detail Records). The bandwidth usage measurement is accurate; what you see is what is really used by subscriber.


Currently the service providers offer packages based on speed.

The cheapest package attracts many consumers with a speed that meets their needs. But these customers on low price levels may also be some of the highest bandwidth users, and like most others, they use these resources during peak hours.

It is possible to implement monthly data limitations, but that doesn’t avoid that your network becomes overloaded every day in the early part of the month.

This can be avoided by increasing the network bandwidth.

However , if the subscriber bandwidth usage is not analyzed and smoothed in the time, and if the higher bandwidth users do not pay in function of the bandwidth usage, the provider has to take in charge the totality of the cost for network improvement investment.

This will lead to big financial losses in a long term approach.

The “DAMERY Subscriber Bandwidth usage analyzer» gives you the ability to accurately measure subscriber bandwidth usage by service flow and establish for each subscriber a daily and a monthly bandwidth usage profile.

Knowledge of the usage profile by subscriber will allow you not only to apply right bandwidth management policies to your subscribers, but this will also allow to adapt your network capability face to bandwidth demand.

Knowing the daily usage profile of your subscriber, you will be able to limit the bandwidth usage during the peak hours by a right pricing policy and extend the life time of your network.

You can now delay to later your investment to increase the network bandwidth capacity.

Subscriber True-bandwidth usage analyzer Summary

Ø IPDR based data collect :

Ø What is measured is really what is used

Ø Daily monthly subscriber bandwidth usage profile

Ø Possibility to fix bandwidth usage limit to each subscriber and take required actions when there is an overflow.

Ø Right bandwidth management policies based on the real usage profile


Please contact our sales department

Tel: +32 65 22 60 64

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Triple Play Solutions

Triple PlayPosted by DAMERY 2015-01-29 13:16:55

Damery Triple Play Architecture

Internet / VOIP / IPTV

Damery IP communication platform based on DOCSIS is able to meet the bandwidth demand required by the triple play applications.

Complete internet / VoIP/ IPTV solution based on standard Docsis.

The DAMERY Docsis system offers up to 800 Mbits bandwidth to the services :

Ø Live TV

Ø Video On Demand (VoD)

Ø Interactive TV (iTV).

Ø IP telephony

Ø Internet

Meet us to discuss with us your specific demands and how you can improve data transmission via your network. We are looking forward to meeting you.smiley

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