ZyXEL Communications MSC1000G Series, Руководство пользователя

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Chapter 11 Profile Screens
Management Switch Card User’s Guide
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11.23 IPQoS Overview
Quality of Service (QoS) refers to both a network’s ability to deliver data with minimum delay, and
the networking methods used to control the use of bandwidth. Without QoS, all traffic data is
equally likely to be dropped when the network is congested. This can cause a reduction in network
performance and make the network inadequate for delay-sensitive applications such as VoIP or
video-on-demand (VOD).
Configure IPQoS to group and prioritize downstream application traffic in queues and fine-tune
network performance.
• IPQoS applies only to the downstream traffic (traffic going to the subscribers).
Min Retrantime Set the minimum duration between any two packets after registration.
Max Retrantime Set the maximum duration between any two packets after registration.
Retran Window Set the total retransmit timer.
RFC2833 Select on to enable RFC 2833 for transmitting digits. When you enable RFC 2833 the
system transmits DTMF signals as voice (in-band) or as separate RFC 2833 packets (out-
of-band) according to the MGC's configuration.
When you enable RFC 2833, set the RTP payload (96~127) type for identifying RFC
2833 packets.
Select no to not use RFC 2833 for transmitting DTMF signals. DTMF signals can only be
transmitted inband.
T38 Select on to enable support for the T.38 fax relay standard.
When you enable T.38 the system uses T.30 to transmit faxes as voice (in-band) or T.38
to transmit faxes as separate packets (out-of-band) according to the MGC's
configuration.
Select off to disable support for the T.38 fax relay standard. The system uses T.30 to
transmit faxes as voice (in-band).
Force Version You can set this to on if the MGC only supports H.248 version 1. Set it to off to use
H.248 version 2.
Apply Click Apply to save the changes in this screen to the system’s volatile memory. The
system loses these changes if it is turned off or loses power, so use the Config Save link
on the navigation panel and then the Save button to save your changes to the non-
volatile memory when you are done configuring.
New While you are modifying a profile, you can click New to start configuring a fresh profile
without saving your changes.
Cancel Click Cancel to start configuring the screen again.
Index This is an incremental number indicating the order in which the H.248 profiles were
created.
Name This is the name of the H.248 profile.
Select Select the H.248 profile you wish to load or delete.
Modify Select a H.248 profile and click this in order to edit its configuration.
Delete Select a H.248 profile and click this to delete the profile. Once deleted, information
cannot be retrieved.
Table 180
Profile VoIP H248 Screen
LABEL DESCRIPTION