原创 0104 Merged Requests

       If the request has no tag in the To header field, the UAS core MUST    check the request against ongoing transac

原创 0105 Require

Assuming the UAS decides that it is the proper element to process the    request, it examines the Require header field

原创 0102 Processing 3xx Responses

  Any new request may receive 3xx responses themselves containing       the original URI as a contact.  Two locations c

原创 0103 Processing 4xx Responses

     Certain 4xx response codes require specific UA processing,    independent of the method.    If a 401 (Unauthorized

原创 0106 Content Processing

  Assuming the UAS understands any extensions required by the client,    the UAS examines the body of the message, and

原创 0817: DSL

什麼是ADSL     什麼是ADSL技術?     ADSL技術是一種不對稱數字用戶線實現寬帶接入互連網的技術,ADSL作爲一種傳輸層的技術,充分利用現有的銅線資源,在一對雙絞線上提供上行640kbps下行8Mbps的帶寬,從而克服了

原创 EPON接入系特點

EPON接入系統具有如下特點: Ø 局端(OLT)與用戶(ONU)之間僅有光纖、光分路器等光無源器件,無需租用機房、無需配備電源、無需有源設備維護人員,因此,可有效節省建設和運營維護成本; Ø EPON採用以太網的傳輸格式同時也是用戶局域

原创 0809今日問題解答:OLT,接入網關的容量,TISPAN, SIGTRAN

OLT: optical line terminal(光纜終端設備),用於連接光纖幹線的終端設備。OLT功能1、向ONU以廣播方式發送以太網數據;2、發起並控制測距過程,並記錄測距信息;3、爲ONU分配帶寬;即控制ONU發關數據的起始時間

原创 0810問題解答:PBX,SDH,DSLAM,MSAN

Private Branch Exchange用戶交換機,也稱爲程控交換機,完成企業內部之間以及與公共電信網絡的電話交換,並將電話,傳真,調制解調器等功能合併   SDH(Synchronous Digital Hierarchy,同步數

原创 0119 Constructing the REGISTER Request

   REGISTER requests add, remove, and query bindings.  A REGISTER    request can add a new binding between an address-

原创 0118 Registrations2

There are many ways by which the contents of the location service can    be established.  One way is administratively.

原创 0108 Generating the Response

     When a UAS wishes to construct a response to a request, it follows    the general procedures detailed in the follo

原创 0815,ODN衰減

總衰減 = Af*L + n*As + Aa*x + Aw*y As, loss of splitter;   Aa: connection, Aw: loss of wdm mode

原创 0816:TG, SG, CPE

Trunk Gateway  翻譯過來就是中繼網關。   TG作用於VOIP網絡,將模擬信號與數字信號相互轉換。   具體工作原理如下:   軟交換VOIP網絡--TG--PSTN,當用戶通過VOIP系統與PSTN網絡通信時,在IP網絡上

原创 0202 不借助strlen的基本字符串匹配算法

int str_str(char* s, char* pattern) {     /* 1, define and init */     int sCnt = 0;     int ptnCnt = 0;     char *ps