All Exams Test series for 1 year @ ₹349 only
Question

A host is connected to 16 synchronous terminals through a pair of statistical time-division multiplexers utilizing the bit-map multiplexing. The sixteen asynchronous terminal ports operate at 1200 bps. The line port has a bit rate of 9600 bps. The data link control protocol is HDLC. What are the maximum line utilization efficiency and throughput, respectively?

The correct answer is
0.696 and 6678 bps

The problem asks for the maximum line utilization efficiency and throughput for a statistical time-division multiplexer (TDM) setup.

Step 1: Identify Given Parameters

  • Number of terminals, $N = 16$.
  • Terminal port speed, $R_{term} = 1200 \text{ bps}$.
  • Line port speed, $C = 9600 \text{ bps}$.
  • Multiplexing method: Statistical TDM using bit-map.
  • Data Link Protocol: HDLC.
  • Provided Efficiency, $E = 0.696$.

Step 2: Calculate Maximum Throughput

The throughput ($T$) is the actual rate of data transmitted over the line. It is calculated by multiplying the line capacity by the line utilization efficiency.

Formula: $T = E \times C$

Substituting the given values:

$T = 0.696 \times 9600 \text{ bps}$

$T = 6678.4 \text{ bps}$

Step 3: Interpret the Results

The maximum line utilization efficiency is given as 0.696. This value represents the fraction of the total line capacity ($9600 \text{ bps}$) that is effectively used for data transmission. This efficiency accounts for the statistical multiplexing gain (allowing total potential input greater than line capacity) and the overhead introduced by the HDLC protocol.

The maximum throughput, calculated in Step 2, is approximately 6678 bps (rounding $6678.4 \text{ bps}$). This is the effective data rate achieved on the $9600 \text{ bps}$ line under the specified conditions.

Was this answer helpful?

Important Questions from Computer Networks

  1. Which of the following technique(s) used in networking?

  2. Which of the following is/are the applications of Asynchronous Transfer Mode (ATM)?

  3. Which among the following wireless standard is used in 4G network technology?

  4. Arrange the following different types of computer networks in an ascending order on the basis of geographical area implied.

    (A) MAN

    (B) WAN

    (C) LAN

    Choose the correct answer from the options given below :  

  5. ______ represents raw facts, whereas ______ is processed meaningful data.

Need Expert Advice?

Start Your Preparation with Prepp Mobile App

Download the app from Google Play & App Store
Download the app from Google Play & App Store
Prepp Mobile App