the following definitions:Character frame, which defines the exchange of characters, is the public part of the two kinds of protocols;Character Exchange at t=0Error correction for t=0Block Exchange at T=1Error correction for T=1* Transport LayerThe application-oriented message transmission for each protocol is defined.* Application LayerThe content of the message exchange is defined according to the same application
From: Author: (2001-11-2307: 08: 00) 1. the goal of the Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently. it is independent of the transfer subsystem and requires only one channel that can ensure the order of transmitted data units. Appendix A, B, C, and D describe the use of SMTP in different transfer services. The terms used in this document are also defined in the glossary. SMTP
From: Author: (07:08:00)
1. Introducti
From: Author: (2001-11-2307: 08: 00) 1. the goal of the Simple Mail Transfer Protocol (SMTP) is to deliver mail reliably and efficiently. it is independent of the transfer subsystem and requires only one channel that can ensure the order of transmitted data units. Appendix A, B, C, and D describe the use of SMTP in different transfer services. The terms used in this document are also defined in the glossary. SMTP from: Author: (07:08:00)
1. Introducti
responsible for data transfer from PPG (Gateway) to mobile device. Push OTA uses two WSP layer services for connection-oriented sessions (confirmed push) and connectionless session (connectionless push), which requires a pre-existing active session between PPG and the client for push using a connection session. That is, a push that requires the caller to receive acknowledgment information, and for connectionless push, the communication is completed through the reserved port. That is, send out,
the IC card is 11~266 ETU, which is determined by the TC1 value returned after the reset response.The minimum time interval between the two-character rising edge of the IC card destined for the terminal should be 11 ETU. The maximum time interval between the rising edge of the starting bit of two consecutive characters in the same piece cwt should not exceed (2 of CWT's +11) ETU, where the byte wait time integer CWI takes value between
frequency band, does not conflict but the channel utilization may not be high, no transmission band idle 6 site LAN, 134 band transmit data, 256 band Idle.Cdma:code Division Multiple AccessEach user is assigned a unique m-bit sequence (chipping sequence), where "0" is denoted by "1", "1" is denoted by "+1". Each user chip sequence mutually orthogonal (orthogonal) each user uses the same frequency carrier, uses the respective chip sequence to encode t
Bluetooth protocol (2) specifications of the Bluetooth protocolChapter 2 Bluetooth protocol specifications (RF, baseband Link Control, and link management)
The Bluetooth protocol is a rule for information exchange between bluetooth devices. Like the Open Systems Interconnec
proxies.Regarding the communication process with the remote host, the mobile host needs to undergo three processes: agent Discovery , registration and transfer of data :1. Agent Discovery# #移动主机在外地网络进行代理发现的基础条件是已知归属代理地址 # #The process of agent discovery is mainly divided into two stages:A. Agent NoticesSend an ICMP message (type value 16: User information Answer) the data in the message is the transfer address, only the foreign agent can use this field.Code bit meaning:
IC card. If a C-APDU is too long to fit in a block of data, it can be routed with several link blocks in the following way.Block (1)CLA INS P1 P2 LC Data dataBlock (2)-Block (n-1)Data data dataBlock (N)Data Data Data LCIf the data and status code sent back by the IC card are too long to fit in a block, it can be handled by several I blocks as described below.Block (1)-Block (n-1)Data data dataBlock (N)Data data Data SW1 SW2The example only shows the
Linux2.6 kernel protocol stack series-TCP protocol 2. Receive, linux2.6 -- tcp
1. queuing mechanism
When receiving incoming TCP packets, there are three Queues:
● Queue to be processed
● Pre-queuing queue
● Receiving queue
The receiving queue contains the processed TCP data segment. That is, all the protocol headers ar
IOS9-by-Tutorials-Study Notes 1: Swift-2-0IOS9-by-Tutorials-Study Notes 1: Swift-2-0
Apple opened up Swift some time ago and made a stir in the iOS development field. He gave a look at Swift's development roadmap and planned to release Swift 3.0 next autumn. Apple is now more developing on Swift, encouraging communities to contribute code, and accepting some feed
Request) and Echo Reply (Echo response): ping the Echo Request and Echo Reply commands actually used.
Source Quench: the Source computer can be notified to reduce the speed of data transmission.
Ø Destination Unreachable (the target cannot be reached)
Ø Time Exceeded (timeout): When the datagram is discarded because the TTL is 0, ICMP will send the message.
Ø Fragmentation Needed (need to be decomposed): When the non-decomposition bit of the datagram
This is a creation in
Article, where the information may have evolved or changed.
Today this tip mainly introduces some knowledge of protocol parsing, go language as a service-side programming language, inevitably involves the communication protocol parsing, even if not to do network communications, it will inevitably involve file parsing, in fact, their knowledge points are the same. In real-world scenario
1 SPDY protocol 1.1 Overview
SPDY is the abbreviation of speedy, which is the pronunciation of speedy.
The SPDY protocol has published four drafts: Version 1, version 2, version 3, and Version 3.1. Version 4 is currently in the trial phase, but has not yet been released. There are some code for version 4 in Chromium.
Advantages of SPDY over HTTP:
Disadvantages:
D
1 Description
2 Concepts of drilling and traversing... 1
3. Drilling and traversing in P2P... 2
4. Features of protocol traversal using stun series... 2
5 relationship between stun/turn/ice protocols... 3
6 STUN Protocol (RFC 5389) 3
6.1 Why stun
binaryunsafe string, the length of the string is saved in front of the string251 1 bytelength the^2 3 byte(the first byte is 252) length the^34byte(the first byte is 253)Else9byte(The first byte is 254) Handshake packet the protocol is sent by the server by the client. The number of bytes
in parentheses, the number of bytes is n is a null string,and thenumber of uppercase n indicates length code binary.
S
is very little Chinese Information on the SIP network. I am still a technician with poor English skills. To help more people understand the SIP protocol and study the SIP protocol, I have such a bold idea.
The original text of this translation is rfc3261. Due to my English proficiency, I use literal translation for the document. Of course, I have a personal understanding between the lines. please correct m
is the same as the IP header check.The Federated Icmp_hun (First Union) and Icmp_dun (data Federation) access multiple ICMP messages according to Icmp_type and Icmp_code. Each ICMP message is usedIcmphun; only a subset of the messages use Icmp_dun. Fields that are not used must be set to 0.The ICMP packets are encapsulated in the IP datagram.PROTOSW Structure of 2.ICMPINETSW[4] 's PROTOSW structure describ
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