HDLC frame format
In HDLc, data and control packets are transmitted in the standard frame format. Frames in HDLC are similar to BSC character blocks, but the datagram and control packets in the BSC protocol are transmitted independently. commands in
High-Level Data Link Control (HDLC) is a bit-oriented data link layer protocol for data transmission over the synchronization network. It is an International Organization for Standardization (ISO) developed based on the ibm sdlc (synchronous Data Link Control) protocol.The Link Control Protocol focuses on the logical transmission of segments into physical blocks or packets. A block or packet is guided by the Starting Sign and ended by the ending sign,
Package for synchronous serial link (serail point-to-point link)3.1-hdlc/ppp High-level Data link Control HDLC (high-level Data Link controls): is a bit-oriented synchronous data Link layer protocol developed by ISO, developed by the SDLC protocol. HDLC Specifies the encapsulation on a synchronous serial line by using frame
Routers are often used to build wide-area networks, and the footprints of WAN links are very different from those on Ethernet. Common WAN packages are HDLC, PPP, Frame-relay, etc., and this chapter describes HDLC and PPP. PPP, in contrast, has more functions than HDLC.1.1.1 HDLC
, PPP can carry other protocols, including DECnet and Novell's Internet Packet Exchange (IPX).Iii. HDLChdlc---bit-oriented synchronization protocol: High-level Data link control (Advanced Information link controls procedures). HDLC is a typical representative of the bit-oriented data Link Control protocol, which does not depend on any kind of character encoding set, the data message can be transparently transmitted, the "0-bit insertion method" for tr
PPP Protocol (Point-to-place protocol) belongs to the network interface layer, which is mainly used for dial-up internet access. PPP has the ability to dynamically assign IP addresses, allows IP addresses to be negotiated at the time of connection, has error detection and correction capability, and supports data compression; in order to establish point-to-point link traffic, each end of the PPP link must first send the LCP packet to set up and test the data link. After the link is established an
follows: 650) this.width=650; "Src=" Http://s3.51cto.com/wyfs02/M01/87/60/wKiom1feXgPTit7yAAAHOcoo-kg649.png-wh_500x0-wm_3 -wmp_4-s_3151135178.png "title=" Ppp.png "width=" and "height=" border= "0" hspace= "0" vspace= "0" style= "width:500px; height:63px; "alt=" Wkiom1fexgptit7yaaahocoo-kg649.png-wh_50 "/>The first two 7E is the frame bound flag, the value is fixed to 7E;FF as the Address field, because the endpoint of the point-to-end link is uni
HDLC is the default protocol used by CISCO routers. A new router uses HDLC Encapsulation by default when no encapsulation protocol is specified.1. Related commandsPort Settings Note: 1. The following example shows the Cisco synchronous serial port status.Router # show interface serial 0Serial 0 is up, line protocol is upHardware is MCI SerialInternet address is 150.136.190.203, subnet mask is 255.255.255.0
1. Related commands
Port setting Task CommandSet HDLC encapsulation hdlcSet the DCE line speed to clockrate speedResets a hardware interface, clear interface serial unit.Show interface status show interfaces serial [unit] 1Note: 1. The following example shows the Cisco synchronous serial port status.Router # show interface serial 0Serial 0 is up, line protocol is upHardware is MCI SerialInternet address is 150.136.190.203, subnet mask is 255.255.255.0
I. Applicable conditions:
1. DDN is the main line, and PSTN is the standby line.
2. The HDLC protocol is used on DDN and the PPP protocol is used on PSTN.
3. dynamic routing can be performed on the main line or the standby line. In this example, dynamic routing is performed on the main line.
II,
Network Topology:
Iii. Solution description:
HDLC support is one of the most impor
Currently, the NDIS library never calls this function, but a miniportinitialize function can call a MINIPORTR Econfigure function as an internal driver function.
NotApplicable
Miniportreset
Issues a hardware reset to the NIC.
Yes
Miniportreturnpacket
Receives a packet from a upper layer is previously passed by a call toNdismindicatereceivepacket.
No
Miniportsend
Transmits a packet through the NIC onto the network. Requ
IDR (instantaneous decoding refresh)-instant decoding and refreshing.
I frame: Intra-frame Encoding FrameIt is an independent frame that comes with all information. It can be decoded independently without reference to other images. The first frame in the video sequence is always an I
There are many things worth learning about in the PPP protocol. Here we will focus on the content of PPP frame relay. First, let's take a look at the basic concepts. PPP: Point-to-Point Protocol. Huawei routers are encapsulated by default and are character-oriented control protocols. HDLC: Advanced Data Link Control Protocol. It is a bit-Oriented Control Protocol and is the default encapsulation of Cisco ro
Android uses Animation-list for frame-by-frame Animation and android for frame-by-frame Animation.What we want to achieve
Prepare resource files and place them in
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PrefaceH264 is a new generation of coding standards, high compression high-quality and support a variety of network streaming media transmission is known, in terms of coding, I understand his theoretical basis is: reference for a period of time, the statistical results show that in several adjacent images, there is generally a difference in pixels only 10% of the points, The difference in brightness does not change beyond 2%, and the chroma difference is only 1% or less. So for a little change i
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Objective
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H264 is a new generation of coding standards, with high compression quality and support for a variety of network streaming media transmission is known, in terms of coding, I understand his theoretical basis is: the reference to a period of time the image of the statistical results show that in the adjacent several images, the general difference in pixels only 10% points, The brightness difference is not more than 2%, and the variation of c
H264 is a new generation of coding standards, with high compression quality and support for a variety of network streaming media transmission is known, in terms of coding, I understand his theoretical basis is:
According to the statistical results of the image for a period of time, it is shown that in the adjacent images, there are only 10% points in the pixels, the difference of luminance is not more than 2%, and the difference of Chroma is less than 1%. So for a small change in the image scree
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Objective
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H264 is a new generation of coding standards, high compression high-quality and support a variety of network streaming media transmission is known, in terms of coding, I understand his theoretical basis is: reference for a period of time, the statistical results show that in several adjacent images, there is generally a difference in pixels only 10% of the points, The difference in brightness does not change beyond 2%, and the chroma diff
H264 is a new generation of coding standards, high compression high-quality and support a variety of network streaming media transmission is known, in terms of coding, I understand his theoretical basis is: reference for a period of time, the statistical results show that in several adjacent images, there is generally a difference in pixels only 10% of the points, The difference in brightness does not change beyond 2%, and the chroma difference is only 1% or less. So for a small change in the im
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