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CoaxData 200Mbps-HDTV
Users Guide
Coax Manager - Manual de Usuario
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General installation conditions:
- Before handling or connecting the equipment, please read this manual.
- In order to reduce the risk of fire or electric shock, do not expose the equipment to rain or
- Do not take the cover off the equipment without disconnecting it from the mains.
- Do not obstruct the equipment’s ventilation system.
- Please allow air circulation around the equipment
- The equipment must not come into contact with water or even be splashed by liquids. Do not
place containers with water on or near the equipment if it is not adequately protected.
- Do not place the equipment near sources of heat or in excessively moisture conditions.
- Do not place the equipment where it may be affected by strong vibrations or knocks.
How to use the equipment safely:
- The powering supply of this product is: 100-264 V~ 50/60 Hz.
- If any liquid or object falls inside the equipment, please contact a specialized technician.
- To disconnect the equipment from the mains, pull from the connector, and never pull from the
- Do not connect the equipment to the mains until all the other connections have been made.
- The mains socket that is going to be used to connect the equipment should be located
nearby and should be easily accessible.
Description of the electrical safety symbols:
This symbol indicates that the equipment complies with the requirements of CE
This symbol indicates that the equipment is for indoor use only
This symbol indicates that the equipment complies with the safety requirements for
class II equipment.
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Description of the application
The CoaxManager application has been developped to allow the user to configure, in an easy and intuitive way, the
CoaxData 200Mbps-HDTV devices, setting the different operating modes. It also allows to check the state of the
installation and the different links between the devices.
Allows to configure the operating mode of the CoaxData 200Mbps-HDTV coaxial modem.
Allows to check the state of an installation establishing the estimate rate between the links set between the
different devices.
Allows to update the device firmware and the configuration file
Allows to set passwords for each network of the system. You can install up to 4 masters (each one with a different
password) in the same coaxial network.
Allows to set QoS parameters in the devices.
System requirements
This application works with Windows 2000/XP/Vista
This application requires the installation of the winpcap library ( If
this library is not installed, the CoaxManager installer will install this library for you.
It is an entirely Plug&Play system. The installation of any driver or additional software is not required.
Installing the Coax Manager application
The Coax Manager application is installed by using an installer that will guide the user during the installation proces.
Language selection: this option selects the language of the installer
Coax Manager - Manual de Usuario
Follow the installer instructions untill finishing the installation of the application:
Once the application has been installed, the following icon will appear on the desktop:
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Connecting Coax Manager to Coaxial Modem
Once the application has been installed, when it starts, it will scan the different Ethernet interfaces of the system
trying to find the different devices connected to the PC.
In the application you can distinguish the “NIC Interface” and “Local Device” combos, which show the interface
and the devices located within those interfaces respectively.
When you press the “Local Device” combo in a particular device, the “Network Devices” combo gets updated
automatically showing the local device and all devices located by it within its network. Network means the group of
devices with which you can connect.
To connect to a device, you must select the device you want to configure and press the Connect button. When you
press this button, the different operations you can do with it will get activated:
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Read Config: allows to read the configuration of the device connected. This operation is done automatically
when connecting with a device.
Write Config: allows to write the configuration set in the application in the device connected.
Factory Defaults: sets the factory configuration settings.
ATTENTION!!!!: Take care with this option because when you set the factory configuration settings of the
device, you will lose the configuration done on it. This button has the same effect than the
Factory Defaults press-button located at the front side of the modems.
Help: It provides access to this manual.
Once you are connected to a device, you will have access to different tabs which show different information about it.
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Configuring the modems
In the Configuration tab you will find different information about the device and also those fields that can be
configured using this application.
In the Device Parameters section you will find some of the parameters related to the device. Now, you will find the
description of some of them:
Firmware Version: Firmware version of the device.
PIB Version: Version of the PIB (parameters information Block) that configures the device.
MAC Address: MAC address of the device that has to be connected.
DAK key (Device Access key): key set during the production process and which determines the access to the
devices when it is carried out remotely (via coaxial) and not locally. You must know this key to update/configure
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the devices remotely.
NMK key (Network Management Key): key set by the user using an algorithm which allows to generate the key
on the basis of the value of the Network Password field. This key establishes whether an slave can connect to a
master or not. Only devices with the same NMK can connect with each other.
NET ID, MDF ID, USR ID: Different descriptive fields of the product establishing the network name, the product
description made by the manufacturer and the product description made by the installer (the last one can be
modified by the installer).
MDU mode: Indicates whether the MDU mode is activated or not.
CCo mode (Central coordinator): Indicates whether the device is master or not. This is external from the MdU
mode, since there are also masters in homenetworking but it is established randomly and internally in the device.
Moreover, it is not deterministic and all devices can communicate between them.
MDU Configuration
It sets the operating mode of the device.
If this option is not activated, the MdU will remain deactivated and the operating mode will be home networking (all
to all).
If this option is activated, the MdU mode will get activated and you must specify the operating mode you want:
Master: The CoaxData 200Mbps-HDTV will work in master mode and will be installed in the headend, as
indicated on the product manual.
Slave: The modem will be installed in an inlet of the distribution, as indicated in the product manual.
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Network Password
This option allows to set the network password of the devices. All devices that want to communicate within the
same network must have the same NMK key.
To make the generation of the NMK key easier, the text inserted in this combo is used as passphrase, which allows
to generate the necessary NMK using an algorithm of hash. The passphrase introduced must not have any spaces.
Note: By default this key is located on the firmware to HomePluAV which will generate a NMK key of
50:D3:E4:93:3F:85:5B:70:40:78:4D:F8:15:AA:8D:B7 (HomePlugAV).
User Description
Descriptive name that the user wants to assign to the device.
Once the user has modified the User Description, Network Password and MDU Mode parameters, you can dump
the configuration on the devices using the Write Config button.
Note: Be careful when using the Write Config option because if you change the access password remotely,
you will not be able to connect again to the device and you will have to do it locally.
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Checking the network
The Coax Manager application also allows to check the created data network. To do so it has a tab called Network
that allows you to visualize the network information related to a device and the other devices that are part of the
same AVLN (Associated Virtual Logical Network), that is, the devices programmed with the same Network password.
Now all parameters shown on Device Info will be described:
MAC: MAC address of the device to which you have connected.
TEI (Terminal equipment identifier): It is the only identifier of a device on a network. It can admit values from
1 (master) to 253 (slave).
Hosts Info: Shows a list of the different users connected to the device from his Ethernet interface.
Now all parameters shown on CCo Info will be described:
MAC of the CCo: MAC address of the device in charge of acting as Cco (Central Coordinator) on the network
of the device. It shows the MAC of the network master.
TEI (Terminal equipment identifier) of the CCo: It is the only identifier of a device on a network. It is always 1.
NID (Network identifier): When a master proceeds to create a new data network over the coaxial, it creates this
value through a hash algorithm.
Note: Remember that in the same coaxial network there can be up to 4 different master coexisting and
creating each one of them an independent network using different network passwords.
SNID (Short Network identifier): Derivational value of the NID but only with one byte. This value is used by the
slaves to identify univocally the master they want to join on the network.
Network Topology
This section contains information regarding the different modems that form a network. When the application is
connected to the master, it shows all the links established with the slaves. If there is not any link established (Bridge
MAC=FF:FF:FF:FF:FF:FF), an estimative piece of information of the channel bandwidth will be shown.
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When there really is an information flow between the master and one slave, information regarding the channel
coding (Mbps) will be shown on the columns corresponding to TXCoded/Raw (Mbps) and RXCoded/Raw(Mbps),
which show the maximum rates reached by the channel coding on each link.
The attenuation conditions, channel noise or nulls in the response in frequency can alter the values obtained for the
To make the analysis of the values indicated on the application more intuitive, a group of colours has been selected
to indicate the channel status:
Indicates that the link is working at maximum rate (120Mbps<throughput<150Mps)
Indicates that the link works at a relative rate (70Mbps<throughput<120Mps)
Indicates that the link has very poor characteristics
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The Coax Manager is capable to show information about Link ToneMap(carriers set with their Modulations
QAM1024,QAM256,...QPSK) and also the Tx Mask; that show if the carriers are attenuation or no in the transmision.
Click over the link and then you can see a new window with all channel dates:
This picture let know adicional information about the link, even more, let have information about the frecuency,
where hight noise or attenuation make the channel fall his tonemap and the rate that each one of the carriers
contribute to the data flow.
This information:
Source and Destination MAC: Devices MAC form the connection.
TX Rate Coded/PHY y RX Rate Coded/PHY (Mbps): Considered rate of the channel as much in transmission
as in reception.
Avg.SNR: Signal SNR average estimation
Avg.Attenuation: Attenuation Average Estimation present in the signal in the transmision network.
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Setting QoS parameters (Advanced User)
This tab allows to configure the QoS parameters of a device.
The CoaxData 200Mbps-HDTV devices rely on diverse mechanisms, which allow to prioritise the different types
of traffic, whether video, voice or data. According to the installation, traffic can have different requirements and the
following mechanisms are provided to guarantee prioritisation.
Mapping at priority Levels
The CoaxData 200Mbps-HDTV devices rely on up to 4 “Channel Access Priority” priority levels: CAP3 (maximum
priority), CAP2, CAP1 and CAP0 (minimum priority). The packets belonging to higher priorities are transmitted first.
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It is possible to perform an allocation of the packets at the desired priority level according to:
Tags VLAN 802.1P: The VLAN Tags are a small data field in the Ethernet 802.1 packets, which determine or specify
the type of package that is processed. Normally, this Tag is source allocated or established by the Switches of
the network according to the input port (or any other parameter: multicast, UDP. target port, etc.). It is possible to
allocate the VLAN 0-7 to whatever priority levels we may want.
Ethernet Frame Header
IP ToS: IP ToS field: The Type of Service field of the IP packets allows to specify the priority of the IP packets. The
RFC 1349 describes this field and the values allocated to the same one according to different variables such as
the delay, optimisation of rate or reliability. It is possible to allocate one of the four Priority levels of the CAP0-3
device according to the first 3 bits of the ToS field (ToS Precedence).
TTL - Time to Live
The CoaxData 200Mbps-HDTV devices allow to specify a parameter called TTL (Time to Live) for each priority
level. This parameter indicates the time that a packet can remain in the buffers (SDRAM)of the device before being
discarded by exceeding the maximum time to live. Once the established time is exceeded, the packet is discarded.
The time that a packet remains in the buffers of a device before being transmitted depends on the network traffic
conditions and of its actual activity, therefore, establishment of these values must bear in mind the application and
the estimated rate of service.
As an example, this mechanism is usually used in Video or VoIP packets in which this time is exceeded, the packet
can be discarded due to too much time having elapsed and considering that it reaches the recipient late and it is
not necessary for de-codification.
It allows us to establish TTL values for each of the priorities and for the MME packets (Management Messages)
which are used by the Coax Manager application for management and configuration of the devices.
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The established default settings are the following:
CA0 traffic: 2000 msec (used for TCP data traffic)
CA1 traffic: 2000 msec (used for TCP data traffic)
CA2 traffic: 300 msec (used for UDP video/music traffic)
CA3 traffic: 300 msec (used for VoIP traffic)
MME traffic: 300 msec (used for Management Messages)
It is recommended not changing the TTL values unless you know exactly what you are doing.
Priority thresholds
The priority thresholds allow us to determine the distribution of the available buffers in the memory according to
the priority. The available buffers are managed according to the allocated percentage for CAP0 (and Greater), CAP1
(and Greater), CAP2 (and Greater) and CAP3.
In transmission, the packets are stored in the different buffers according to their priority. If in a given time, the
number of admissible maximum packets is exceeded by a given priority, the packet is discarded leaving room for
packets of major priority..
Assume that it has the following allocation of priorities
1.- CAP 0 and higher = 40%
2.- CAP 1 and higher = 30%
3.- CAP 2 and higher = 20%
4.- CAP 3 = 10%
At a given time, according to the traffic conditions, if the entire number of buffers used for the transmission is less
than 40% of the available buffers, traffic of all the priorities will be accepted. If, on the other hand the number of
buffers used exceeds 40% only packets of CAP1 priority or greater will be accepted.
NOTE: This mechanism allows to safeguard the buffers of the system, reserving them beforehand to prevent
packets of major priority from remaining without storage space in the devices while they wait to be
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Default priorities
This section allows to allocate packets to priorities which may not possess a VLAN tag or a specific ToS field:
Unicast (by CAP1 default): VLAN the default priority for Unicast packets without a VLAN tag transmitted between
IGMP (by CAP3 default): Allows to allocate the priority of IGMP packets used to manage multicast streams.
Multicast (by CAP1 default): Priority allocated to multicast streams which are not managed by IGMP; in other
words, those multicast streams for which IGMP has not generated any reports nor do any IGMP queries exist
which may manage them.
Streams Multicast managed by IGMP (by default CAP3): Priority allocated to multicast streams which have
been managed by devices by means of IGMP Snooping.
Bandwidth limit
The bandwidth limit allows to establish a limit in the total rate of transmitted data, independently of the priority
allocated to the same ones. This limit is only enabled in case the established functioning mode may be MDU. The
established minimal value is 2Mbps and the maximum 16Mbps in increments of 64kpbs.
Upstream Limit: Limits the traffic transmitted by the Ethernet hosts of a device.
Downstream Limit: Limits the traffic transmitted by the Ethernet hosts of a device.
NOTE: The bandwidth limit is a feature which can be used in MDU distributions in which the installer may
want to establish a limit in the bandwidth used by the users by means of its programming in the slave
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Establishing advanced parameters of the device (Advanced User)
It is possible to establish a series of very specific parameters for the device, which determine functioning of the
same in very certain cases.
Shown below is a capture of the application appears for advanced parameters:
IGMP options
The IGMP options allow to define the performance of the device according to the IGMP protocol (Internet Group
Management Protocol).
The system supports both IGMPv2 and IGMPv3.
Although it is not an objective of the current manual, the IGMP protocol defines a series of elements which are
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necessary to take into account:
IGMP join: Message sent by a final device or Set-top Box which wants to be linked to a multicast group.
IGMP leave: Message sent by a final device or Set-top Box which wants to leave a multicast group.
IGMP Querier: The IGMP Querier is a device which implements a series of IGMP Query messages (normally
Multicast Routers or Switches of average range with this capacity) where it periodically asks the network if there
is someone who is linked to a multicast group. If that is the case, it responds with an IGMP message in which it
indicates the groups to which it is linked. The requests of the IGMP Querier usually indicate a generic question
directed to all the multicasts, or specific questions about each one of the multicasts that it manages.
According to the specified exchange of messages, the IGMP protocol defines a series of timing components which
do or do not expire according to the presence of the above mentioned messages on the network:
Group Specific Queries Timeout: This timing component expires after 260 seconds in which no there are no
IGMP Queries performed for a specific group that has been registered in the device. Registered group refers to
Set-top boxes which exist that indicate their belonging to a certain group responding to the IGMP Queries that
are periodically performed for this group on the part of the Multicast Router. If the timing component is disabled,
once the multicast stream is registered, it will not be eliminated from the table although there may not be any
queries performed by the Multicast Router.
All system Quieries Timeout: This timing component expires after 260 seconds in which there are no generic
IGMP Queries performed for all of the devices connected to any (All) multicast group. If the timing component
is disabled, no multicast stream will be eliminated from the table by expiry of the timing component associated
with the IGMP All System Query requests.
Group Membership Timeout: This timing component controls the period which goes on from the transmission
of a query to the STB and the lack of answer. It allows for the elimination of a stream for which there has not
been an answer on the part of any STB. If the timing component is deactivated, the stream will remain active
Normally, when a Router or a non-detected Switch responds after several query attempts over a certain multicast
and it decides to eliminate the above mentioned requests from the network, establishing a conservative procedure
concerning use of the bandwidth, it causes the Master to stop transmitting said streams to the coaxial network after
expiry of the timing components.
If you do not have an IGMP Querier installed on your Video distribution, or we do not want the streams to be
eliminated in the expiry, disable the timing components by means of the available checkboxes in the application.
Additionally, a series of parameters associated with the IGMP can be configured:
Forward Unknown/Unmanaged Streams: Disseminates all of the multicast streams from the master to the
slaves even if nobody is registered on the same. It is necessary to bear in mind that although no list exists with
the devices registered in the multicast, the master uses a very conservative modulation, which redounds to an
excess of bandwidth consumption. Use of this option is not recommended unless you truly know what you are
IGMP Reports to Non-Querier Hosts: Allows the IGMP join/leaves step proceeding from the STB even if the
presence of queries has not been detected in the system. This allows the system to disseminate the multicast
reports even if there are no queries in the same, where the STB periodically indicate with IGMP join report
messages its intention of belonging to a certain multicast group.
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NOTE: Although implementation of Video Streaming systems is possible, which do not require the existence
of IGMP Queriers, it is recommended that the installer implement an IGMP Querier, by means of a
Router or multicast Switch, so that an automated management system may be provided and which
may guarantee that the bandwidth is only used when the users really want to use the video services.
Limiting the number of users
MAC Address Limit: This option allows to establish a limit in the number of MAC Hosts connected to the
Ethernet ports that a device accepts. This option can be used by installers for hotels, buildings, who may want
to limit the number of users who make use of the data service from the slaves and it allows to have control over
the total number of users who will use the data network.
Bridge Address Aging: It allows to establish the timing component used to determine when an entry in the local
table (associated with the Ethernet hosts) or a remote table (in which the hosts of other devices are gathered
from the network) is valid or has expired.
Reducing the existence of multiple masters
Normally in a network formed by a master and several slaves, the latter transmit at maximum power in order to
guarantee the greatest coverage and possible rate of transfer.
It is possible that in a coaxial network in which two different networks have been set up, with two masters and their
respective slaves, the slaves are poorly isolated among themselves or the isolation provided by the network is not
sufficient and an interference of the signals may take place proceeding from one network to the other.
Decrease TX Power
and / or
Decrease RX Sensitivity
Network coverage
area is reduced
Overlap of networks is
reduced or eliminated
and each network can
achieve max thruput
When several close masters exist among themselves or are poorly isolated and we want to form two different
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networks, there is the option of controlling the power of transmission and the sensitivity of reception of the devices
from a network to mitigate the effect that these transmissions have in a close network and vice versa. This is done
by means of detection of certain packets from nearby networks.
If you want to enable this option, check the Dynamic Option which allows the masters of each of the networks to
control the power of the transmissions of all the elements in order to mitigate the effects that the transmissions have
in a nearby network.
If this option is not enabled, Disable, the transmissions of other nearby networks will be viewed as interferences in
the transmission causing a decrease in the rate of transfer between the devices.
(1) It is necessary to bear in mind that the mitigation process is done by reducing the power of transmission
of the devices and their sensitivity with the consistent loss of coverage and rate. This option allows both
networks to obtain better rates provided that the coverage of the same ones is not excessive and a decrease
in the power of the transmissions does not bring about a decrease in the quality of the links.
(2) This adjustment process uses an iterative algorithm that can have a convergence period of some 17
min. We may, therefore, have to bear this in mind whenever we start up the devices again. This very long
period is due to the fact that the system has to distinguish between inherent and/or transitory noises in the
transmission line of the nearby systems transmissions that cause permanent interference.
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Updating the firmware of the devices
The update of the devices allows to update the firmware to other more recent versions.
However, other possible application consists of loading the device with configuration files (PIB) that cannot be
configured by the application (remember that the coax manager does not allow to modify all the firmware parameters,
but only those identified as the most important ones).
This will be done by defining specific PIB files that have a particular use.
If you want to update the firmware of the devices, the installer must have two basic files:
NWM file: this file contains the firmware for the MAC of the device.
PIB file (parameter information block): this file contains the parameters with which the firmware has been
configured. You must take into account that the NWM file and the PIB file programmed on the device
must have the same firmware version. Otherwise, the device will malfunction..
Press the Update Firmware button to update the device.
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