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Universal T1 WAN (UTWAN)
N0008589 3.3
UTWAN connection
The UTWAN connection supports frame relay or Point-to-Point protocol (PPP) at the link layer.
The link protocol you use depends on the existing network or on the service you buy from your
Internet service provider.
Frame Relay
In Frame Relay mode, the UTWAN interface allows up to 50 PVCs (permanent virtual circuits) to
be configured. You can assign the same IP for multiple PVCs, or a unique IP for each PVC. To
avoid IP routing confusion, it is important that each unique IP belongs to a unique subnet.
The available Data Link Control interface numbers are 0-1023. Of the 1024 PVCs, 16 are
reserved. The maximum number of PVCs allowed is 1008.
The range of the Data Link Control Interface (DLCI) numbers is between 0 and 1023. However,
within this range, only 16 through 991 are available for user connections. The other ports are
reserved as follows:
•
0 and 1023 are reserved for the Local Management Interface (LMI) handshake
•
992 through 1007 are reserved for Frame Relay management at layer 2
•
1 through 15 and 1008 through 1022 are reserved for future use
Point-to-Point-Protocol (PPP)
Point-to-Point Protocol (PPP) is a full-duplex transmission protocol for communication between
two computers using a serial interface. A typical PPP connection is a personal computer connected
by telephone line to a server. For example, your Internet service provider (ISP) provides you with
a PPP connection so that the ISP server can respond to your requests, pass them on to the Internet,
and return your requested Internet responses to you.
Fragmentation
Frame Relay fragmentation and PPP fragmentation are link-layer fragmentation schemes.
Over a slow link, the major advantage of using link-layer fragmentation over IP layer
fragmentation is that while it reduces the jitter effect for voice packets, it also reduces the
end-to-end delay for data packets that is introduced by IP layer fragmentation.
RTP Header compression
The RTP Header Compression feature allows you to compress the 40 byte IP/UDP/RTP header to
2 or 4 bytes. This reduces the header-to-payload ratio of a data transmission. This is particularly
true of data transmissions with smaller payloads, such as a IP telephony packets. By reducing the
header-to-payload ratio, you can increase your bandwidth utilization. With slower links, this
allows more data or simultaneous IP telephony conversations to be carried over the link at the
same time.
Содержание BCM 3.7
Страница 1: ...Part No N0008589 3 3 December 2006 Business Communications Manager 3 7 Programming Operations Guide...
Страница 4: ...4 Software licensing N0008589 3 3...
Страница 32: ...32 Contents N0008589 3 3 W 937 Index 939...
Страница 46: ...46 Tables N0008589 3 3...
Страница 64: ...64 How to get help N0008589 3 3...
Страница 90: ...90 Manually activating Telnet N0008589 3 3...
Страница 116: ...116 Delayed system restart N0008589 3 3...
Страница 194: ...194 Configuring a data module N0008589 3 3...
Страница 276: ...276 Setting line telco features N0008589 3 3...
Страница 310: ...310 Using COS passwords N0008589 3 3...
Страница 364: ...364 Enhanced 911 E911 configuration N0008589 3 3...
Страница 380: ...380 Renumbering DNs N0008589 3 3...
Страница 398: ...398 Saving wizard pages on your computer N0008589 3 3...
Страница 458: ...458 Voice Mail settings N0008589 3 3...
Страница 488: ...488 Setting system telco features N0008589 3 3...
Страница 508: ...508 Other programming that affects public networking N0008589 3 3...
Страница 522: ...522 PRI networking using Call by Call services N0008589 3 3...
Страница 592: ...592 Monitoring Hunt groups N0008589 3 3...
Страница 636: ...636 Configuring Double Density N0008589 3 3...
Страница 640: ...640 Using the Network Update Wizard N0008589 3 3...
Страница 666: ...666 Importing and Exporting DHCP data N0008589 3 3...
Страница 722: ...722 Restarting the router N0008589 3 3...
Страница 726: ...726 Important Web Cache considerations N0008589 3 3...
Страница 748: ...748 Configuring an Interface with NAT N0008589 3 3...
Страница 794: ...794 IPSec N0008589 3 3...
Страница 818: ...818 Configuring the Policy Agent characteristics N0008589 3 3...
Страница 832: ...832 Firewall rules for Business Communications Manager with Dialup interfaces N0008589 3 3...
Страница 876: ...876 ISDN Programming N0008589 3 3...
Страница 1004: ...1004 Index N0008589 3 3...