• Document: Link-Layer Protocol Lab High-Level Data Link Control ( HDLC ) Introduction:
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Link-Layer Protocol Lab High-Level Data Link Control ( HDLC ) Introduction: There are a number of similar standards for bit-oriented data link control protocol, namely HDLC (by ISO), ADCCP (by ANSI), LAPB (by CCITT), and SDLC (by IBM). High-Level Data Link Control (HDLC) has a wide variety of different options and modes of operation. It is designed for a variety of link types, including either multi-access or point-to-point links and three possible modes of operations, i.e. NRM, ARM, and ABM, one of which is selected when the link is initialized for use. In this lab, we have two computers are connected by a point-to-point link using HDLC protocol. One is set to be DTE and the other is set to be DCE. The Asynchronous Balance Mode (ABM) mode is used in this experiment. The one with DTE is used to be the sender and the one with DCE is used as the receiver. Both half-duplex and full-duplex transmission mode can be used. The main purpose of this lab is for a student to be able to set up the link and observe frames being sent during different communications phases: link setup, data transfer, and link disconnection. Student should be able to distinguish the sender and the receiver of each frame and the data transfer sequence can be observed by using FELINE protocol analyzer which will capture all frames transmitted between those two stations. Finally, student will conduct the experiment to compare the performance of the HDLC, a bit-oriented link layer protocol, with the Kermit, a character-oriented link layer protocol, using different window sizes. While performing, the steps of this lab, students should consider why the HDLC protocol behaves m the manner they observed and in the comparison to the other link layer protocol such as Kermit. In doing so, they will gain into the trade off that protocol designers and users must make when they design and use the communications protocols. HDLC Lab - Rev: 4/27/1998 1 Equipment and Setup: Only one HDLC setups will be available for students to use. Students may work in groups of no more than three persons. A sign-up sheet for the lab equipment will be posted outside the lab. • Estimated Time: One Hour • Table 1 is a list of the equipment required for this lab. The equipment should be pre-configured for you before coming to the lab. Consult with on-duty GSA if you have any difficulty identifying or operating the correct equipment Qty Equipment Description 3 NCR 386/sx Pc (or equivalent) as detailed below • 1 PC serving as a HDLC sender. • 1 PC serving as a HDLC receiver. • 1 PC serving as the FELINE Protocol Analyzer. 2 S502E cards (supports hardware interrupts as well as operating in a passive polled mode.) 2 HDLC Support for MS-DOS 1 FELINE/ParaScope Pod (Parallel interface). 1 FELINE Protocol Analysis Software Table 1: Hardware and Software required for the HDLC/Link-Layer lab. Setting up HDLC, Feline, and the ParaScope Pod: The outer PCs are configured with HDLC software to transfer files over the serial cable, and the center PC is configured with the FELINE software and the ParaScope Pod to monitor and examine the transfer. A null-modem serial cable is connected between the 25-pin RS-232 port on one of the HDLC PCs and one of the ParaScope Pod. A standard serial cable is then connected from the 25-pin RS-232 port on the ParaScope Pod and the 25-pin RS-232 port on the HDLC PC. The ribbon cable attached to the ParaScope pod is attached to the FELINE PC’s parallel port. Check to make sure that the AC-adapter is plugged into the ParaScope Pod and into the 110-volt AC outlet. Finally, check that the power switch on the ParaScope Pod is turned on. Note: • Please do not attach or detach any of the serial or parallel cables while the PCs are powered on. This can damage the serial port on the PC. There are already many PCs in the lab that will not work because of damage to the serial port. Turn the power off, or ask the GSA for assistance in moving any cabling. • Before turning on the PC installed with FELINE, make sure that the ParaScope Pod is already powered on and do not turn off ParaScope Pod after you finish. HDLC Lab - Rev: 4/27/1998 2 Lab Procedures: Part I - Analyze HDLC Frames: Overview: In this part of the lab, you will learn how to configure and setup the connection between the DCE and DTE using the HDLC protocol and how to change the HDLC communications configuration. The information frame (I-frame) will be sent and captured in the FELINE buffer. You need to specify the contents in the HDLC I-frame. As a means of achieving uniformity we have the left PC labeled as the sender, t

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