Operating Protocol; Network Delay; Network Jitter; Packet Loss - JVC VN-H657U Instructions Manual

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Instructions manual (72 pages)

Table Of Contents

Table of Contents

Bit Rate of H.264 Stream

You can select either the Variable Bit Rate (VBR)

or Constant Bit Rate (CBR) system for H.264

stream.

When the VBR system is selected, the bit rate

varies according to the condition of the camera

images. The VBR system delivers a stable picture

quality, but forecast of the bit rate is difficult. When

the CBR system is selected, encoding is performed

at a fixed bit rate regardless of the condition of the

camera images. The picture quality varies under

the CBR system, but the bit rate can be easily

forecast.

You can specify an estimated bit rate for both VBR

and CBR. (64 kbps to 8192 kbps)

H.264 Baseline cannot be set for multiple encoders

at the same time. Only one channel can be set with

a frame size of 1280´720 or lower and a bit rate of

1.5 Mbps or lower.

Insufficient Network Bandwidth

When there is insufficient bandwidth, the number

of JPEG frames (frame rate) that the client can

acquire will decrease. Delay will also occur in the

distribution of images. In the case of H.264, noise

interference may occur and playback may fail.

Network Delay

When the client acquires JPEG via TCP, the

camera will send out data while checking the ACK

from the client at the same time. For networks with

considerable delay, data cannot be sent out until

ACK is received, and therefore the frame rate will

drop. In the case of H.264, noise interference may

occur and playback may fail.

A decrease in the frame rate due to network delays

can be eliminated by receiving data via multicast.

Network Jitter

When there is considerable network jitter, delay

time may be prolonged and the image frame rate

may drop. In the case of H.264, noise interference

may occur and playback may fail.

Packet Loss

When acquiring images from camera via TCP,

packet loss may be recovered by TCP

transmission. When there is considerable delay in

the network, however, missing data may occur and

the image frame rate may drop. In the case of H.

264, noise interference may occur and playback

may fail.

When packet loss occurs during multicast sending

from camera, the image frame rate may drop. In the

case of H.264, noise interference may occur and

playback may fail.

List of Protocols and Port Numbers

Used by Camera

The camera uses the protocols and port numbers

listed below. Ensure that these ports are allowed

through the firewall when a firewall is to be installed.

Protocol/Port number

Source

TCP/80

TCP/554

TCP/32040

Destination

TCP/ User-defined

number

UDP/ User-defined

number

TCP/20, 21

TCP/25

TCP/110

UDP/123

UDP/161