This is the Coaching materials in Telephony, Cellular and Facsimile Part 3 as one topic in ECE Board Exam taken from various sources including but not limited to past Board Examination Questions in Electronic System and Technologies (EST), Communications Books, Journals and other Communications References. This particular Coaching Notes in Communications Engineering has random Questions and Answers in random topics. Make sure to familiarize this review notes to increase the chance of passing the ECE Board Exam.
Telephony, Cellular and Facsimile Coaching Materials Part 3
141. What is the frequency deviation of AMPS?
Ans. 12 kHz
142. Transmission from mobile stations to the base stations is called _____.
Ans. Reverse link or Uplink
143. Determine the transmit and receive carrier frequencies for AMPS channel 3 and channel 991.
Ans. 870.09 MHz and 869.04 MHz
144. It is a 34-bit binary code that represents the 10-digit telephone number.
Ans. Mobile Identification Number (MIN)
145. A 32-bit binary code permanently assigned to each of the mobile unit.
Ans. Electronic Serial Number (ESN)
146. Supervisory Audio Tones (SAT) have frequencies
Ans. 5970 Hz, 6000 Hz, and 6030 Hz
147. The bit length of System Identification (SID)
Ans. 15
148. The bit length of Station Class Mark (SCM)
Ans. 4
149. The bit length of Digital Color Code (DCC)
Ans. 2
150. It is a database in the PCS network that stores information about the user, including home subscription information and what supplementary services the user is subscribed to.
Ans. Home Location Register (HLR)
151. A database in the PCS network that stores information about subscribers in a particular MISO serving area.
Ans. Visitor Location Register (VLR)
152. Determine the transmit power for a CDMA mobile unit that is receiving a signal from the base station at 100 dBm.
Ans. Pt = -76 dB – Pr; Pt =-76 dB – 100; Pt = 24 dBm
153. The North American PCS band is
Ans. 1.9 GHz
154. PCS cells are typically _______ than AMPS cells.
Ans. Smaller
155. IS-136 PCS is usually just called _______.
Ans. TDMA PCS
156. GSM is a _____ system.
Ans. TDMA
157. IS-95 PCS uses ______ technology.
Ans. CDMA
158. Current PCS systems are called ____-generation systems.
Ans. Second
159. Types of Class 4 toll center which provides human operators for both outward and inward calling service.
Ans. Class 4C
160. The ERP of class II mobile phone used in GSM system.
Ans. 1.6
161. The ESS assigned at the factory of cellular mobile phone, consists of how many bits?
Ans. 32
162. The speech coding rate for GSM cellular mobile is _______.
Ans. 13 kbps
163. What modulation technique is used by the European Cordless Telephone?
Ans. GFSK
164. Compared to AMPS, PCS cells are _______ in size.
Ans. Smaller
165. The spread-spectrum technique used in IS-95 is ________.
Ans. CDMA (direct sequence)
166. The spread-spectrum technique used in GSM is ________.
Ans. frequency hopping
167. Unlike AMPS, CDMA such as IS-95 allows for a _______ handoff.
Ans. Soft
168. The orthogonal PN sequences used in CDMA are called a ______ code.
Ans. Walsh
169. ______ diversity is inherent in any spread-spectrum system.
Ans. Frequency
170. RF channels S/N ratios _____ than zero is typical in CDMA systems.
Ans. Less
171. CDMA uses a ______-rate vocoder.
Ans. Variable
172. A phone user typically talks less than ________ of the time during a conversation.
Ans. 50%
173. How does GSM achieve frequency diversity?
Ans. It uses limited frequency hopping.
174. Why was PCS assigned to 1.9 GHz instead of the 800-MHz band used for AMPS?
Ans. The 800 MHz band was already overcrowded.
175. The “forward” PCS channel is
Ans. from base to the mobile
176. CDMA technology was invented by
Ans. Qualcomm
177. In GSM, voice channels are called
Ans. traffic channels
178. In CDMA
Ans. all frequencies are used in all cells
179. CDMA uses a set of PN sequences that are _______.
Ans. Orthogonal
180. If a 28.8 kbps modem is being used over a cell phone, how many words of text would be lost during a 100-msec handoff interruption assuming 10 bits per letter and 5 letters per word?
Ans. 57.6
181. A certain cell site contains 200 cell phones. The probability that cell phone is being used is 15%. What is the traffic in erlangs?
Ans. 30
182. WISPs offer access to the internet at speed up to _____ Mbps.
Ans. 11 *
183. The data signaling channel in a cellular system that handles the administrative overhead is known as
Ans. Paging channel
184. The data rate of information transfer of mobile devices using “Bluetooth”
Ans. 1 Mbps
185. The access method used in 3G mobile telephony.
Ans. WCDMA
186. A 3G wireless system promise to increase its network capacity by how much percent as compared to lower generation wireless system.
Ans. 70
187. In CMTS, the frequency separation between forward and reverse channel is
Ans. 45 MHz
188. The period for a single time slot in the GSM-TDMA slot is ______ µsec.
Ans. 577 *
189. The ratio of the separation distance between two co-channel cells and the cell radius is known as
Ans. co-channel interference reduction
190. Bluetooth Standard
Ans. IEEE 802.15
191. Bluetooth maximum distance
Ans. 10 m
192. Bluetooth is operating at the ISM frequency range of
Ans. 2.402 – 2.480 GHz *
193. Bluetooth uses
Ans. frequency hopping
194. What is the other name of the IEEE 802.16 standard for broadband wireless
Ans. WiMAX
|
AMPS |
Advanced Mobile Phone Service |
MSC |
Mobile Switching Center |
|
BSC |
Base Station Controller |
MTSO |
Mobile Telephone Switching Office |
|
CDPD |
Cellular Digital Packet Data |
NAM |
Number Assignment Module |
|
CMAC |
Control Mobile Attenuation Code |
PCS |
Personal Communication Systems |
|
DCC |
Digital Color Code |
PN |
Pseudo random Noise |
|
EDGE |
Enhanced Data Rates for Global Evolution |
RCC |
Radio Common Carrier |
|
ERP |
Effective Radiated Power |
SAT |
Supervisory Audio Tone |
|
ESN |
Electronic Serial Number |
SCM |
Station Class Mark |
|
ESN |
Electronic Serial Number |
SID |
System Identification Number |
|
GPRS |
General Packet Radio Service |
SIM |
Subscriber ID |
|
IMSI |
International Mobile Subscriber Identification |
UPT |
Universal Personal Telecommunications |
|
IMT |
International Mobile Telecommunications |
UWT |
Universal Wireless Telecommunications |
|
MIN |
Mobile Identification Number |
WCDMA |
Wide CDMA |
|
MSC |
Mobile Switching Center |
WISP |
Wireless Internet Service Provider |
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