Siqura TC620-PID, Руководство пользователя

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TC620-PID
Page 62
12.3.5.2 Stream Manager
Video > Encoder # > Advanced > Stream Manager
Balancing network load
Peaks in the network load vary with encoder output. Use the Stream Manager to balance network
load. It can limit the output rate per stream sent to the transmitters. Be warned that setting the
Stream bandwidth limit to a lower value may introduce latency because peaks in the encoder
output will be buffered.
Item Description
Stream bandwidth limit Range: [0...100000] kbit/s. Sets the maximum bit rate per stream sent to the
transmitters. This will serve to spread bursts but in its turn may give rise to
latency, e.g. when handling large I-frames.
You are advised to limit the outgoing bit rate per encoder to a maximum of
15 Mbit/s. The total outgoing bit rate of all encoders (including the Live View
encoder), RTSP controlled streams, and SAP streams, should not exceed 25
Mbit/s. See the value for the Total tx bit rate parameter on the Measurements tab
of the Status page.
The Stream bandwidth limit mechanism is disabled when Low latency (see
below) is selected. See also the graphic in the Note on FloodGuard.
Keep-alive interval
Range: [10 … 100000] milliseconds. The frequency for sending keep-alive
messages to the encoder.
Low latency Raises the output bandwidth limit to allow for peaks in the network load. To be
selected if you need to keep the delay between the input and output of images as
short as possible, for improved tracking with a dome camera for example.
Selecting
Low latency disables the Stream bandwidth limit mechanism.
Note on Low Latency mode:
This mode may cause packet loss in the network. In this mode,
short bursts of 100 MB data may overflow the input buffer of an Ethernet aggregation switch. As
a rule of thumb, the average load of an Ethernet port should not exceed 40% of its maximum
load (i.e. 40 MB for a 100 MB port).