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andrewjohn8
GMAT Focus 1: 645 Q80 V88 DI78 
Posts: 34
Updated on: 12 May 2024, 01:02
Originally posted by andrewjohn8 on 11 May 2024, 16:03.
Last edited by Bunuel on 12 May 2024, 01:02, edited 1 time in total.
Last edited by Bunuel on 12 May 2024, 01:02, edited 1 time in total.
Formatted the question.
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West River Glen is deciding which network architecture should replace its old copper telephone lines. The town will replace 300 miles of Outside Plant (OSP) cable that will serve approximately 2,500 homes.
The first option is to install a Fiber to the Home (FTTH) system architecture that uses fiber-optic cable to transmit signals from the source to each home. The advantages of this architecture include greater bandwidth capabilities, less signal loss, and slightly lower new-cable deployment
costs than the second option, Hybrid Fiber-Coax (HFC).
An HFC network integrates fiber-optic cables and devices with coaxial cables. This will cost the town substantially less money for internal equipment and for customer installations. However, the coaxial cable does not last as long as fiber-optic cable and will thus need to be replaced more frequently, resulting in higher long-term maintenance expenses.
The town believes that either the FTTH or HFC architectures will be capable of serving the communities' data and television needs for the next 30 years.
The first option is to install a Fiber to the Home (FTTH) system architecture that uses fiber-optic cable to transmit signals from the source to each home. The advantages of this architecture include greater bandwidth capabilities, less signal loss, and slightly lower new-cable deployment
costs than the second option, Hybrid Fiber-Coax (HFC).
An HFC network integrates fiber-optic cables and devices with coaxial cables. This will cost the town substantially less money for internal equipment and for customer installations. However, the coaxial cable does not last as long as fiber-optic cable and will thus need to be replaced more frequently, resulting in higher long-term maintenance expenses.
The town believes that either the FTTH or HFC architectures will be capable of serving the communities' data and television needs for the next 30 years.
The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks.: No
Labor expenses comprise the majority of the costs associated with the new cable deployment for HFC.: Yes
An HFC network installation involves a smaller installation cost per home than FTTH.: Yes
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
52% (03:10) correct
48%
(03:10)
wrong
based on 1459
sessions
History
Date
Time
Result
Not Attempted Yet
For each of the following statements, select YES if the statement can be inferred to be true on the basis of the information provided. Otherwise, select NO.
| Yes | No | |
| The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks. | ||
| Labor expenses comprise the majority of the costs associated with the new cable deployment for HFC. | ||
| An HFC network installation involves a smaller installation cost per home than FTTH. |
ShowHide Answer
Official Answer
The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks.: No
Labor expenses comprise the majority of the costs associated with the new cable deployment for HFC.: Yes
An HFC network installation involves a smaller installation cost per home than FTTH.: Yes
95% lower internal equipment deployment costs
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
74% (01:30) correct
26%
(01:17)
wrong
based on 1218
sessions
History
Date
Time
Result
Not Attempted Yet
According to the information provided, which of the following attributes is an advantage of HFC network architecture as compared with FTTH architecture?
| Lower new cable deployment costs | |
| Lower maintenance expenses | |
| Greater longevity of coaxial cable | |
| 95% lower internal equipment deployment costs | |
| 90% lower customer installation costs |
ShowHide Answer
Official Answer
95% lower internal equipment deployment costs
If the town only considers cost over the first 10 years, the FTTH option is best.: Not Supported
If the town only considers cost over the first 20 years, the FTTH option is best.: Supported
If cost is not considered, the FTTH option is best.: Supported
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
50% (01:08) correct
50%
(01:18)
wrong
based on 1456
sessions
History
Date
Time
Result
Not Attempted Yet
For each of the following statements, select SUPPORTED if the statement is supported by the information given. Otherwise, select NOT SUPPORTED.
| Supported | Not Supported | |
| If the town only considers cost over the first 10 years, the FTTH option is best. | ||
| If the town only considers cost over the first 20 years, the FTTH option is best. | ||
| If cost is not considered, the FTTH option is best. |
ShowHide Answer
Official Answer
If the town only considers cost over the first 10 years, the FTTH option is best.: Not Supported
If the town only considers cost over the first 20 years, the FTTH option is best.: Supported
If cost is not considered, the FTTH option is best.: Supported
Attachment:
File comment: graph for tab 3
DS MSR graph.png [ 37.47 KiB | Viewed 12449 times ]
DS MSR graph.png [ 37.47 KiB | Viewed 12449 times ]
Attachment:
File comment: Table for tab 2
DS MSR table.png [ 65.62 KiB | Viewed 12522 times ]
DS MSR table.png [ 65.62 KiB | Viewed 12522 times ]
12 May 2024, 06:16
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Let us work on the paras. We can carry certain information on each tab and come back to relevant portion as per the requirement of the questions.
Discussions: It gives relative pros and cons of FTTH and HFC network architectures.
Initial cost: This gives us the cost related to to installation of each network per mile of OFC.
Cumulative cost: This gives the cumulative cost over 20 years.
Let us go to the questions..
(I) Mark Yes,if the option is true.
1. The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks.
The important words are new cable deployment costs . These details are given in tab 2, Initial costs.
The new cable deployment costs depends on labour and material and has no Home component to it.
So, mark NO.
2. Labor expenses comprise the majority of the costs associated with the new cable deployment for HFC.
The answer again lies in the second tab, wherein we can see that labour costs is approx 16k out of 28k, that is more than 50%.
Mark YES
3. An HFC network installation involves a smaller installation cost per home than FTTH.
The answer again lies in the second tab, wherein we can see that HFC instl per home costs 125, while FTTH costs 748$ per home.
Mark YES
(II) According to the information provided, which of the following attributes is an advantage of HFC network architecture as compared with FTTH architecture?
We can go to tab 1 and tab 2
1. Lower new cable deployment costs: Tab 2 gives the cost for HFC as 28K as compared to 26k for FTTH. Not an advantage for HFC network arch.
2. Lower maintenance expenses: The third para in tab 1 talks of higher maintenance expenses. DIscard
3. Greater longevity of coaxial cable: The tab 1 gives info on the contrary.
4. 95% lower internal equipment deployment costs: Tab 2 gives HFC and FTTH costs under this head as 820 and 16118, and 820 is around 5% of 16118, so the statement is true and is an advantage of HFC over FTTH.
5. 90% lower customer installation costs:Tab 2 gives HFC and FTTH costs under this head as 125 and 748, but 125 is around 16% of 748, so the statement is not true although HFC does have lower customer installation than FTTH, but not lower by 90%.
Answer: 4
(III) Mark Supported, if statement is supported
1. If the town only considers cost over the first 10 years, the FTTH option is best.
The answer lies in the graph in tab 3. We can see the cumulative cost shown by blue dotted line is lower compared to black line against 10th year. So, HFC is better of the two and hence not supported.
2. If the town only considers cost over the first 20 years, the FTTH option is best.
One can easily go wrong here if one doesn't realize that the lines are giving the cumulative cost, that the total cost incurred given by the lines at any point includes sum of all costs in previous year till that year. In 20th year, the blue dotted line is higher than black. Hence, FTTH is less costly and economical over a period of 20 years. Hence, supported.
3. If cost is not considered, the FTTH option is best.
Tab 1 gives various advantages of FTTH over HFC in terms of durability, greater bandwidth capabilities and less signal loss.
Hence, supported
Discussions: It gives relative pros and cons of FTTH and HFC network architectures.
Initial cost: This gives us the cost related to to installation of each network per mile of OFC.
Cumulative cost: This gives the cumulative cost over 20 years.
Let us go to the questions..
(I) Mark Yes,if the option is true.
1. The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks.
The important words are new cable deployment costs . These details are given in tab 2, Initial costs.
The new cable deployment costs depends on labour and material and has no Home component to it.
So, mark NO.
2. Labor expenses comprise the majority of the costs associated with the new cable deployment for HFC.
The answer again lies in the second tab, wherein we can see that labour costs is approx 16k out of 28k, that is more than 50%.
Mark YES
3. An HFC network installation involves a smaller installation cost per home than FTTH.
The answer again lies in the second tab, wherein we can see that HFC instl per home costs 125, while FTTH costs 748$ per home.
Mark YES
(II) According to the information provided, which of the following attributes is an advantage of HFC network architecture as compared with FTTH architecture?
We can go to tab 1 and tab 2
1. Lower new cable deployment costs: Tab 2 gives the cost for HFC as 28K as compared to 26k for FTTH. Not an advantage for HFC network arch.
2. Lower maintenance expenses: The third para in tab 1 talks of higher maintenance expenses. DIscard
3. Greater longevity of coaxial cable: The tab 1 gives info on the contrary.
4. 95% lower internal equipment deployment costs: Tab 2 gives HFC and FTTH costs under this head as 820 and 16118, and 820 is around 5% of 16118, so the statement is true and is an advantage of HFC over FTTH.
5. 90% lower customer installation costs:Tab 2 gives HFC and FTTH costs under this head as 125 and 748, but 125 is around 16% of 748, so the statement is not true although HFC does have lower customer installation than FTTH, but not lower by 90%.
Answer: 4
(III) Mark Supported, if statement is supported
1. If the town only considers cost over the first 10 years, the FTTH option is best.
The answer lies in the graph in tab 3. We can see the cumulative cost shown by blue dotted line is lower compared to black line against 10th year. So, HFC is better of the two and hence not supported.
2. If the town only considers cost over the first 20 years, the FTTH option is best.
One can easily go wrong here if one doesn't realize that the lines are giving the cumulative cost, that the total cost incurred given by the lines at any point includes sum of all costs in previous year till that year. In 20th year, the blue dotted line is higher than black. Hence, FTTH is less costly and economical over a period of 20 years. Hence, supported.
3. If cost is not considered, the FTTH option is best.
Tab 1 gives various advantages of FTTH over HFC in terms of durability, greater bandwidth capabilities and less signal loss.
Hence, supported
27 Jul 2024, 00:07
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In Q1 - for 1st part - The new cable deployment costs of both FTTH and HFC networks depend on the number of homes served by the networks.
chetan2u cost per mile is given , but if no of homes increases - > miles increase ( The town will replace 300 miles of Outside Plant (OSP) cable that will serve approximately 2,500 homes.) - > total cost increase.
Am i thinking too much ?
chetan2u cost per mile is given , but if no of homes increases - > miles increase ( The town will replace 300 miles of Outside Plant (OSP) cable that will serve approximately 2,500 homes.) - > total cost increase.
Am i thinking too much ?
