barcode project in vb.net Figure 3-41 Superframe (D4) framing in Software

Generation Code 39 Extended in Software Figure 3-41 Superframe (D4) framing

Figure 3-41 Superframe (D4) framing
Code-39 Recognizer In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Making Code-39 In None
Using Barcode generator for Software Control to generate, create USS Code 39 image in Software applications.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Reading Code 3/9 In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Create Code 3 Of 9 In Visual C#
Using Barcode creation for VS .NET Control to generate, create Code-39 image in .NET applications.
Telephony
Make ANSI/AIM Code 39 In .NET
Using Barcode creation for ASP.NET Control to generate, create ANSI/AIM Code 39 image in ASP.NET applications.
Creating Code39 In Visual Studio .NET
Using Barcode printer for VS .NET Control to generate, create USS Code 39 image in .NET applications.
Telephony
Generate Code 39 In VB.NET
Using Barcode generator for Visual Studio .NET Control to generate, create Code39 image in .NET framework applications.
Bar Code Printer In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
Back to the signal framing bits: Within a transmitted superframe, the second and fourth signal framing bits would be the same, but the sixth would toggle to the opposite value, indicating to the receiving equipment that the samples in that subframe of the superframe should be checked for signaling state changes. The eighth and tenth signal framing bits would stay the same as the sixth, but would toggle back to the opposite value once again in the twelfth, indicating once again that the samples in that subframe should be checked for signaling state changes.
Paint GS1-128 In None
Using Barcode generator for Software Control to generate, create USS-128 image in Software applications.
Code-128 Drawer In None
Using Barcode drawer for Software Control to generate, create Code 128A image in Software applications.
Today: Extended Superframe
DataMatrix Maker In None
Using Barcode generation for Software Control to generate, create Data Matrix image in Software applications.
GTIN - 13 Generation In None
Using Barcode generation for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
While superframe continues to be widely utilized, an improvement came about in the 1980s in the form of extended superframe (ESF), shown in Figure 3-42. ESF groups 24 frames into an entity instead of twelve and, like superframe, reuses some of the frame bits for other purposes. Bits 4, 8, 12, 16, 20, and 24 are used for framing and form a constantly repeating pattern (001011 . . . ). Bits 2, 6, 10, 14, 18, and 22 are used as a six-bit cyclic redundancy check (CRC) to check for bit errors on the facility. Finally, the remaining bits all of the odd-numbered frame bits in the frame are used as a 4 Kbps facility data link for end-to-end diagnostics and network management tasks. ESF provides one major benefit over its predecessors: the ability to do unintrusive testing of the facility. In earlier systems, if the user reported trouble on the span, the span would have to be taken out of service for testing. With ESF, that is no longer necessary because of the added functionality provided by the CRC and the facility data link.
Encoding Identcode In None
Using Barcode creator for Software Control to generate, create Identcode image in Software applications.
Decode Code 3 Of 9 In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
Figure 3-42 Extended Superframe (ESF) framing
Painting Bar Code In Objective-C
Using Barcode generator for iPad Control to generate, create barcode image in iPad applications.
DataMatrix Drawer In .NET
Using Barcode generator for Visual Studio .NET Control to generate, create Data Matrix image in Visual Studio .NET applications.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
Bar Code Drawer In None
Using Barcode maker for Font Control to generate, create barcode image in Font applications.
UCC - 12 Generation In Java
Using Barcode encoder for Java Control to generate, create UPC-A image in Java applications.
Telephony
Print Bar Code In None
Using Barcode creator for Font Control to generate, create bar code image in Font applications.
Encoding Code 128 In Java
Using Barcode drawer for Android Control to generate, create Code 128 Code Set B image in Android applications.
The Rest of the World: E1
3
E1, used for the most part outside of the United States and Canada, differs from T1 on several key points. First, it boasts a 2.048 Mbps facility, rather than the 1.544 Mbps facility found in T1. Second, it utilizes a 32channel frame rather than 24. Channel 1 contains framing information and a four-bit cyclic redundancy check (CRC-4); Channel 16 contains all signaling information for the frame; and channels 1 through 15, and 17 through 31 transport user traffic. The frame structure is shown in Figure 3-43. There are a number of similarities between T1 and E1 as well: Channels are all 64 Kbps and frames are transmitted 8,000 times per second. And whereas T1 gangs together 24 frames to create an extended superframe, E1 gangs together 16 frames to create what is known as an ETSI multiframe. The multiframe is subdivided into two sub-multiframes; the CRC-4 in each one is used to check the integrity of the sub-multiframe that preceded it. A final word about T1 and E1: Because T1 is a departure from the international E1 standard, it is incumbent upon the T1 provider to perform all interconnection conversions between T1 and E1 systems. For example, if a call arrives in the United States from a European country, the receiving American carrier must convert the incoming E1 signal to T1. If a call originates from Canada and is terminated in Australia, the Canadian originating carrier must convert the call to E1 before transmitting it to Australia.
Up the Food Chain: From T1 to DS3 . . . and Beyond
When T1 and E1 first emerged on the telecommunications scene, they represented a dramatic step forward in terms of the bandwidth that service providers now had access to. In fact, they were so bandwidth rich
Copyright © OnBarcode.com . All rights reserved.