Week 3 Chapter 1 Part 2 - Pages 1-41 to 1-77 Flashcards
Principles of Transmission
The patch cord return loss test for a balanced twisted-pair permanent link requires that the patch cord be tested _____ mechanical handling to ensure that the impedance remains stable and within tight limits.
a. Before and after
b. After
c. Before
a. Before and after
p 1-62
The patch cord is often a weak link in a cabling system. The patch cord return loss test requires that the patch cord be tested before and after mechanical handling to ensure that the impedance remains stable and within tight limits.
A maximum of ten 10BASE-T systems can share a common binder group in a multi-pair balanced twisted-pair cable having category 3 transmission characteristics.
a. True
b. False
b. False
p 1-72
Examples of the restrictions on shared sheaths for specific applications using binder groups in multipair cables having category 3 transmission characteristics include the following:
• No more than TWELVE (12) 10BASE-T systems can share a common binder group.
Which one of the following is not an information channel in an asymmetric digital subscriber line (ADSL) circuit?
a. A plain old telephone service (POTS) channel
b. A medium-speed duplex channel
c. A high-speed downstream channel
d. A low-speed upstream channel
d. A low-speed upstream channel
p 1-43
An ADSL circuit connects an ADSL modem on each end of a single balanced twisted-pair telephone line, creating three information channels
—a high-speed downstream channel,
—a medium-speed duplex channel,
—and a POTS channel.
Series inductance is related to the:
a. Dimensions and separation of conductors and to the dielectric constant of the insulation and jacket materials
b. Dimensions and separation of conductors
c. Dielectric loss of the insulation and jacket materials
b. Dimensions and separation of conductors
p 1-51
The series inductance L, expressed in H, is the loop inductance of a pair of conductors for an incremental length (Δ×). Series inductance is related to the dimensions and separation of conductors.
ISDN B channels are assigned for:
a. Signaling and packet data
b. Voice and data
b. Voice and data
p 1-41
Basic rate ISDN:
• Is intended for residential and small business users.
• Uses a digital signal consisting of two 64 kb/s B channels (assigned for voice and data) and one 16 kb/s D channel (assigned for signaling and packet data).
Three power source equipment options for PoE are available. A(n) _____ is a PoE switch that can provide power to the PD via the structured cabling system.
a. Midspan device
b. Endspan device
b. Endspan device
p 1-77
Endspan devices, a PoE switch can provide power to PD via the structured cabling system.
Practical attenuation measurements yield values that are higher than the attenuation, depending on the degree of mismatch.
a. True
b. False
a. True
p 1-53
The magnitude of the reflection is given by the reflection coefficient (ρ). If Zt < Zo, then the polarity of the reflected wave is inverted
a. True
b. False
a. True
p 1-55
If Zt > Zo, then the polarity of the reflected wave is
not inverted.
Reflection coefficient (ρ) = (Zt – Zo)/(Zt + Zo)
Mutual capacitance is related to the:
a. Dimensions and separation of conductors and to the dielectric constant of the insulation and jacket materials
b. Dimensions and separation of conductors
c. Dielectric loss of the insulation and jacket materials
a. Dimensions and separation of conductors and to the dielectric constant of the insulation and jacket materials
p 1-51
The mutual capacitance C, expressed in F, is capacitance between a pair of conductors for an incremental length (Δ×). Mutual capacitance is related to the dimensions and separation of conductors and to the dielectric constant of the insulation and jacket materials.
What is the maximum power output from the PSE for Type 2 PoE?
a. 30 W
b. 25.5 W
c. 15.4 W
d. 12.95 W
a. 30 W
p 1-75
802.3at defines a Type 2 maximum power output of 30W from the PSE and up to 25.5 W to the PD.
In general, characteristic impedance has both a(n) _____ and a(n) _____ component.
a. Inductive; resistive
b. Resistive; capacitive
c. Capacitive; inductive
d. Inductive; reactive
e. Resistive; reactive
e. Resistive; reactive
p 1-53
In general, the characteristic impedance has both a resistive and reactive component. Characteristic impedance is a function of the frequency of the applied signal, but it is unrelated to the cable length.
Baseband composite video signaling can be supported over a minimum of ___ balanced twisted-pair cable in excess of ≈100 m (328 ft).
a. Category 6 / class E
b. Category 5e / class D
c. Category 3 / class C
c. Category 3 / class C
p 1-47
Baseband composite signaling can be supported over category 3/class C or higher cabling in excess of ≈100 m (328 ft)
The term broadband video refers to composite baseband video and audio signals
a. True
b. False
a. True
p 1-47
Rate-adaptive digital subscriber line (RADSL) adapts its transmission speed based on the:
a. Type of signal being transmitted and the volume of data traffic
b. Volume of data traffic and the signal quality of the line
c. Length and signal quality of the line
d. Type of signal being transmitted and the length of the line
c. Length and signal quality of the line
p 1-44
RADSL is the rate-adaptive variation of ADSL. Transmission speed is rate adaptive based on the length and signal quality of the line.
___ is the minimum performance for balanced twisted-pair network cabling according to BICSI best practices.
a. Category 6A / class EA
b. Category 6 / class E
c. Category 5e / class D
d. Category 3 / class C
b. Category 6 / class E
p 1-64
Category 6/class E or higher cabling represents BICSI best practices.
