JVC VN-C215VP4U User Manual download pdf (Page 32)

Setting

● Ensure that there is sufficient network

bandwidth for the data volume to be sent out

by VN-C215VP4U.

●

Data volume to be sent by VN-C215VP4U varies

with the settings and number of distributions.

● The maximum bit rate from VN-C215VP4U is

about 9 Mbps.

Estimation of total bit rate

The JPEG file size per frame varies with the encoding

settings as well as input video signals. The following

table may be used as a reference. When VFS is

selected, the quantization table during JPEG

encoding will be maintained and the file size will

increase/decrease according to the input signals.

When AFS is selected, encoding will be performed

such that the average size of multiple JPEG images is

the target file size.

VN-C215VP4U accepts requests from up to a

maximum of 5 clients. In addition, it also allows

transmission of 1 multicast stream. The total frame

rate refers to the sum of these frame rates.

For example, when 10 fps is requested by 2

clients, and in addition multicast is transmitted at

a rate of 10 fps, the total frame rate will be:

10 + 10 + 10 = 30 fps

If the JPEG file size per frame is 30 KB, then the

total bit rate will be:

30 KB x 30 fps = 900 KB/s = Approx. 7.2 Mbps

Insufficient network bandwidth

When there is insufficient bandwidth, the number

of JPEG frames (frame rate) that the client can

acquire will decrease.

Network Delay

When the client acquires JPEG via TCP, VN-

C215VP4U 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.

Drop of frame rate due to network delay can be

eliminated by sending data via multicast.

Network Jitter

When there is considerable network jitter, delay time

may be prolonged and the image frame rate may drop.

Packet Loss

When acquiring images from VN-C215VP4U via

TCP, packet loss may be recovered by resending

by TCP. When there is considerable delay during

resending, however, missing data may occur and

the image frame rate may drop.

When packet loss occurs during multicast

sending from VN-C215VP4U, the image frame

rate may drop.

List of protocols and port numbers used

by VN-C215VP4U

VN-C215VP4U

uses the protocols and port

numbers listed below. Ensure that these ports are

allowed through the firewall when a firewall is to be

installed.

Network Requirements

Picture Quality

Control Method

VGA File

Size

QVGA File

Size

VFS

(Variable

File Size)

1 (High)

80 KB 27 KB

60 KB 20 KB

40 KB 13 KB

(Medium)

30 KB 10 KB

25 KB 8 KB

20 KB 7 KB

7 (Low)

15 KB 5 KB

AFS

(Average File Size)

Selection

may be

made from

the range

between 10

and 100 KB

Selection

may be

made from

the range

between 3

and 33 KB

Protocol/Port No. Purpose of Use

TCP/80 JPEG acquisition, Web

Settings page, API

TCP/20, 21 FTP

TCP/25 Mail delivery

TCP/User Setting No.

Alarm sending

UDP/User Setting No.

Alarm sending

UDP/User Setting No.

Multicast sending

UDP /123 SNTP

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