EECE233 Exam 2 Possible Questions (Fixed)

Fiber

Out of the following telecommunications mediums, which has the greatest distance × bandwidth product?

SS7 — trunks

Which of the following is not a method to carry trunks?

Achieve frequency reuse

Sectoring is a way to do what?

Trunks

Phone lines connecting only from phone switch to phone switch?

SS7

A high speed computer network used for look-ahead call placement (saves telephone trunks from being seized to check if the called phone is busy):

Dial tone

The following is a form of AC signaling in the telephone network:

Point of Presence

The POP is what?

A different hopping pattern "code" is used for each trunk

With FHSS (CDMA - spread spectrum), how does communications take place?

It will help you to determine the number of combo trunks

Why is it important to calculate the amount of telephone traffic coming out of a telephone switch to the C/O?

Step-by-step solution:

Call frequency = 900 calls/hour

Average holding time = 30 seconds

Total call seconds = 900 calls × 30 seconds = 27,000 seconds

Erlangs = Total seconds / 3600 = 27,000 / 3600 = 7.5 Erlangs

During the busiest hour of the year, a company reports an average call holding time of 30 seconds, and 900 calls per hour. What is the traffic volume in Erlangs?

Lines connect between the switch and phones; trunks connect from switch to switch

What most clearly explains the difference between phone lines and phone trunks?

Tie trunks are permanent, private connections between two PBX systems. Combo trunks connect a PBX to the public network, handling both incoming and outgoing calls.

What most clearly explains the difference between tie trunks and combo trunks?

VOIP

Can be used to carry telephone trunks.

Sectoring

Promotes frequency reuse.

PBX

Allow a greater number of calls to be statistically handled with fewer trunks

T1 circuit

Can carry 24 digitized phone calls.

Smart trunk

Can carry 23 digitized phone calls.

Single mode fiber

Has the highest bandwidth compared to other types of cables.

Chromatic dispersion

Single mode fiber suffers from this but not modal dispersion.

False

True or false: Multimode fiber suffers from chromatic dispersion but not modal dispersion.

True

True or false: Multiplexing and Demultiplexing is a function of OSI Layers in the Layered Model of data communications.

True

True or False: Encapsulation and DeEncampulsation is a function OSI layers of the Layered Model in data communications.

TCP

The function of well-known ports is handled by what standard in the Transport Layer?

Layered Model and Encapsulation

Helps to keep communications code simple and fast.

Well-known TCP ports

In the TCP/IP version of the OSI model, this helps to identify the application program (e.g. email, web, browser, etc) needing to receive the packets handed up from the transport layer.

TCP.

In the TCP/IP version of the OSI Model, this helps to handle flow control, missing packets, and packets arriving out of order.

SMDR

In a PBX, records call statistics like:

Auto affiliation

In a cellular network, this helps to find your cell phone when a call comes in:

MAC address

Is a 12-digit HEX number.

Sectoring

A method for improving frequency reuse in cellular systems

Chromatic Dispersion

Is present in single mode fiber.

SS7

Is a look-ahead call placement computer network for the phone system.

Racetrack effect

Describes a situation where a phone network experiences large loads under abnormal statistics.