AVC761 Network speeds

[kikate 0]

Hi ,

 

I bought AVTECH AVC761 with Lan and Usb port.

 

When I connect to Lan the Max speed is 10Mbit/s.

 

If i connect my pc with DVR the autonegotiation speed Lan start but not stop. Work only if I put in my Lan Card Pc "Force 10Mbit"

 

It's the same with router.

 

any suggestion?

 

Thank

[scorpion 0]

The DVR does not transmit at 10Mbit/s over the internet. You will only receive your video remotely in the Kbit range.

 

What part of Auto Negotiation are you having problems with?

 

 

Today a number of technologies, such as 10BaseT,

100BaseTX, and 1000BaseT, use the same RJ-45 connector,

creating the potential for connecting electrically incompatible

components together and causing network disruption.

In addition, with the advent of Gigabit Ethernet over copper,

three-speed devices now support 10 Mbps, 100 Mbps, and

1000 Mbps operation. The Institute of Electrical and

Electronics Engineers IEEE developed a method known

as auto-negotiation to eliminate the possibility of dissimilar

technologies interfering with each other.

 

Gigabit transceivers at the physical layer (PHY) of the Open

Systems Interconnection (OSI) model use auto-negotiation to

advertise the following modes of operation: 1000BaseT in full or

half duplex, 100BaseTX in full or half duplex, and 10BaseT in full

or half duplex. Although auto-negotiation can be disabled for

100BaseTX or 10BaseT connectivity, it is always required for normal

1000BaseT operation.

 

Auto-negotiation enables an easy upgrade path to gigabit

speeds by future proofing the server network connectivity with a

three-speed network interface card (NIC) or LAN on motherboard

(LOM). A server connected to a Fast Ethernet switch or

hub can easily be upgraded to Gigabit Ethernet by connecting

the NIC to a Gigabit Ethernet switch. If both the NIC and the

switch are set to auto-negotiate, the interface will be automatically

configured to run at 1000 Mbps.

 

The auto-negotiation algorithm (known as NWay) allows two

devices at either end of a 10 Mbps, 100 Mbps, or 1000 Mbps link to

advertise and negotiate the link operational mode—such as the

speed of the link and the duplex configuration of half or full

duplex—to the highest common denominator.

In addition, for 1000BaseT, NWay determines the master-slave

interlock between the PHYs at the ends of the link. This mode is

necessary to establish the source of the timing control of each

PHY. NWay is an enhancement of the 10BaseT link integrity test

(LIT) signaling method and provides backward compatibility with

link integrity.

 

Auto-negotiation is defined in Clause 28 of the 1998 edition

of the IEEE Standard (Std) 802.3.

[scorpion 0]

When to Use Ethernet 10/100 Mb Auto-Negotiation

 

http://www.cisco.com/warp/public/473/3.html#when

 

Auto-negotiation is an optional function of the IEEE 802.3u Fast Ethernet standard that enables devices to automatically exchange information over a link about speed and duplex abilities.

 

Auto-negotiation is targeted at ports. These ports are allocated to areas where transient users or devices connect to a network. For example, many companies provide shared offices or cubes for Account Managers and System Engineers to use when they are in the office. Each office or cube has an Ethernet port permanently connected to the office network. Because it might not be possible to ensure that every user has either a 10 Mb, a 100 Mb Ethernet, or a 10/100 Mb card in their laptop, the switch ports that handle these connections must be able to negotiate their speed and duplex mode. The alternative is to provide both a 10 Mb and a 100 Mb port in each office, or cube and label them accordingly.

 

One of the most common causes of performance issues on 10/100 Mb Ethernet links occurs when one port on the link operates at half-duplex while the other port operates at full-duplex. This occurs when one or both ports on a link are reset and the auto-negotiation process does not result in both link partners having the same configuration. It also can occur when users reconfigure one side of a link and forget to reconfigure the other side. Both sides of a link should have auto-negotiation on, or both sides should have it off. Cisco recommends to leave auto-negotiation on for those devices compliant with 802.3u.

 

Many performance-related support calls are avoided if you correctly configure auto-negotiation. Many Catalyst Ethernet switching modules support 10/100 Mb and half-duplex or full-duplex. Exceptions include the Ethernet Group switch modules. The show port capabilities {mod_num} | {mod_num/port_num} command shows if the module you are working on supports 10/100 Mb and half-duplex or full-duplex. This document uses two WS-X5530 Supervisor Engine IIIs, each with two optional uplink 10/100 BaseTX Ethernet ports installed.

 

 

Cisco: Configuring and Troubleshooting Ethernet 10/100/1000Mb Half/Full Duplex Auto-Negotiation

 

http://www.cisco.com/warp/public/473/3.html

[kikate 0]

ok,

 

but normally this dvr Avc761 works on 10Mbs or 100Mbs ?

 

It's defected?

[scorpion 0]

For the price range that it is it is a very good DVR.

 

The video server that they have bolted on to the DVR to make it a DVR that can connect to the internet is not really that good of a device.

 

It seems to me that you are DEMANDING high quality video, at gigabit speeds? Is this correct?

 

Are you just using tools to test the speed of the DVR, but the speed is not important to the function that you need??

 

I may be wrong as my specialty is the entry level market / entry level priced products, but to my knowledge there is no DVR that delivers at gigabit speeds.

 

Why is this important to you?

 

As video cannot go over the internet it has to be compressed. Some compressions are better than others H.264 is hoping to become the next holy grail once some of the limitations are worked out. H.264 requires higher level chip set that entry level DVRs are not using.

 

Have you tried an ICRealtime DVR?

http://icrealtime.com/solutions/dvrs.asp

 

They use the Black Fin processors, and that should do good enough!

 

What are you trying to accomplish??

.

[kikate 0]

ok,

 

but normally this dvr Avc761 works on 10Mbs or 100Mbs ?

 

It's defected?

 

This question to ask if 10Mbit it's a normal lan speed of DVR!

 

Someone with this DVR know if normally works to 10Mbit/s

 

Or my Dvr isn't work correctly?

[scorpion 0]

I am sorry. I cannot answer your question. I am not qualified to answer your question.

 

One: I have never measured the speed of any DVR. I do watch the remote video, and it will show the speed there on the screen. I do not know how to take an independant measurement to verify the speed that the viewer is telling me.

 

Two: I truely do not know what you are asking for.

 

I would say yes your DVR can work on 1000Mbit Lan system. In other words a 4 cylinder slow car can travel on the high speed German Autobahn.

 

Are you asking does it transmit video at gigabit speed? The answer is no.

 

What are you using to test your speed?

What kind of router are you using?

 

If you are saying that you are not satisfied with how the video looks on your computer then you are right, it does not look that great.

[remo-mec 0]

I have a AVC761 and made a backup over ethernet. (over USB its very slow)

The switch shows 100Mb/s but I tryed it out and for 400MByte the system uses 40 minutes!

 

My system changes often the channels. I postet "AVC761 channel changing problems". Works your system fine? After some minutes ore hours on channel 1 is under backup channel 3 or 4... Life video is allways perfect!

 

Many thanks,

remo-mec

[kikate 0]

remo-mec please write your type of switch that work on 100Mps

 

thanks

[remo-mec 0]

The switch is a 8-Port 10/100M Nway Switch from Conrad Electronics

in germany.

The LED's shows like 100MB/s but its very slow.

 

remo-mec