Week 31 Chapter 16 Part 2 - Pages 16-38 to 16-77 Flashcards
A(n) _____ wireless local area network (WLAN) is enabled with a single access point (AP) is used to manage communications between stations.
a. Extended service set (ESS)
b. Basic service set (BSS)
c. Independent basic service set (IBSS)
b. Basic service set (BSS)
p 16-69
A BSS WLAN is enabled when a single AP is used to manage the communications between two or more stations equipped with wireless NICs. The use of an AP makes it possible to increase the number of stations and the physical span of the WLAN since the AP centrally
manages all communications.
Down conversion of RF transported over fiber, typically have losses between ___ to ___ dB.
a. 0.5, 1
b. 1, 3
c. 3, 5
d. 5, 7
c. 3, 5
p 16-53
The optical losses for these systems are similar to analog, typically 3 to 5 dB. Optical fiber connectors for down conversion systems may be ST type or SC type with APC polished ferrules meeting the required optical return loss of more than 35 dB.
For digital sampling of RF signals the typical loss budgets are more than ___ dB; with long-range systems more than __ dB.
a. 6, 12
b. 12, 25
c. 25, 30
d. 30, 50
b. 12, 25
p 16-53
The optical budget for digital systems depends on the type of transceiver and SFF connectors and whether avalanche photo diodes are used. Typical loss budgets are more than 12 dB; with long-range systems more than 25 dB. Optical connectors for SFF-based systems are LC type.
Digital systems are more immune to reflection and scattering and do not require APCs. The optical return loss requirements are 12 dB.
Analog modulation of RF signals typical required optical return loss, which includes reflection and backscatter, is more than ___ to___ dB
a. 6, 12
b. 12, 25
c. 25, 30
d. 35, 45
d. 35, 45
p 16-53
Typical required optical return loss, which includes reflection and backscatter, is more than 35 to 45 dB. These optical fiber transmission criteria may vary by DAS manufacturer.
Infrared (IR) communications defined by the Infrared Data Association (IrDA) used line-of-sight (LoS) transmission, with a maximum allowable level of surrounding illumination of _____ lux.
a. 1
b. 10
c. 50
d. 100
b. 10
p 16-66
IR is a purely LoS system. IR is unaffected by RF, but it can be affected by ambient light. The IrDA standard specifies a maximum level of surrounding illumination of 10 lux. Use a light meter if daylight is present in the proposed area.
___ combines the output of two or more transmitters into a single antenna system while achieving the desired signal strength and system performance.
a. Diplexing
b. Duplexing
c. Multiplexing
d. Coupling
a. Diplexing
p 16-59
The objectives of diplexing are to:
––Maintain proper transmission limits set by the manufacturer or regulatory body.
––Provide adequate bandwidth at each frequency that is diplexed.
––Control and minimize signal loss.
___ combines the forward and reverse signal paths onto a single cable.
a. Diplexing
b, Duplexing
c. Multiplexing
d. Coupling
b, Duplexing
p 16-59
The term ___ mode is used to describe a BSS WLAN since it is necessary to obtain and install an AP prior to enabling wireless communications.
a. Logical
b. Structured
c. Infrastructure
d. Basic
c. Infrastructure
p 16-69
An AP can be a stand-alone unit or it can be connected to a cabled network using a cabling link. In both cases, the term infrastructure mode is used to describe a BSS WLAN since it is necessary to obtain and install an AP prior to enabling wireless communications.
The APs in an ESS can be linked using cabled or wireless networking. In both cases, the network used to link the APs is referred to as the ___ system.
a. Mesh
b. PTMP
c. Extended
d. Distribution
d. Distribution
p 16-69
The APs in an ESS can be linked using cabled or wireless networking. In both cases, the network used to link the APs is referred to as the distribution system. When cabling is used to create a distribution system, each AP is described as a portal or gateway—it converts signals between the IEEE 802.11-based WLAN and the distribution system network (e.g., IEEE 802.3 Ethernet LAN).
IEEE 802.15 specifies a throughput of up to ___ kb/s, operates in the 2.4 GHz band, and uses frequency-hopping spread spectrum.
a. 512
b. 720
c. 1020
d. 2040
b. 720
p 16-65
IEEE 802.15 specifies a throughput of up to 720 kb/s, operates in the 2.4 GHz band, and uses frequency-hopping spread spectrum.
Up to ___ IEEE 802.15 devices can be supported in one piconet. Piconets can be combined to form larger networks called scatternets.
a. 2
b. 4
c. 6
d. 8
d. 8
p 16-65
Omnidirectional antennas broadcast equally in all directions of only ___ cross section of their toroidal (doughnut-shaped) three-dimensional radiation pattern
a. One
b. Two
c. Three
a. One
p 16-42
Omnidirectional antennas generally are mounted so that they radiate with equal strength in all horizontal directions.
Singlemode optical fiber cabling used for distributed antenna system (DAS) distribution can interconnect remote transceivers to a base transceiver station (BTS) over a maximum span of:
a. 20 km (12.4 mi)
b. 10 km (6.2 mi)
c. 5 km (3.1 mi)
d. 1 km (0.6 mi)
c. 5 km (3.1 mi)
p 16-41
- Singlemode optical fiber cabling—Used for both indoor and outdoor applications, interconnecting remote transceivers, up to ≈5 km (3.1 mi), back to the BTS.
- Multimode optical fiber cabling—Primarily used for indoor applications, interconnecting remote transceivers, up to ≈500 m (1640 ft), back to the BTS. Indoor systems that utilize multimode optical fiber cabling are designed around 50 μm optical fiber cabling.
A(n) _____ wireless local area network (WLAN) is enabled when two or more stations equipped with wireless network interface cards (NICs) communicate with each other.
a. Extended service set (ESS)
b. Basic service set (BSS)
c. Independent basic service set (IBSS)
c. Independent basic service set (IBSS)
p 16-69
An IBSS WLAN is enabled when two or more stations equipped with wireless NICs communicate with each other. An IBSS is intended to serve a small number of devices in a common area (e.g., meeting room), typically for a limited length of time.
In distributed antenna system (DAS) design, the term link budget is also called operating:
a. Output
b. Gain
c. Loss
d. Margin
d. Margin
p 16-59
The term link budget also is called operating margin. It refers to the sum of ICT gains and losses, beginning with the transmitter and continuing to the receiver, including transmission line loss and antenna gains.
