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350-022 PDF DEMO:
QUESTION NO: 1
The following are wire sizes used in telephone company cables. Which will allow the greatest
"reach" (distance) in DSL service?
A.24 AWG (0.5 mm)
B.26 AWG (0.4 mm)
C.A line that is 50% of #24 (0.5mm) and 50 % of #26 (0.4mm).
D.None of the above will allow enough reach for DSL service.
Correct:A
QUESTION NO: 2
What is the effect of changing DMT interleaved delay from 16 milliseconds to 2 milliseconds?
A.Fewer ATM PVCs can be provisioned on the DSL line.
B.Latency is reduced, but error correction effectiveness may also be reduced.
C.Latency remains the same, but faster error correction occurs.
D.Latency remains the same, but throughput is increased.
Correct:B
QUESTION NO: 3
What effect do load coils in a telephone line have on DSL service?
A.Load coils cause low trained rates for ADSL (CAP or DMT), but do not degrade SDSL, SHDSL, or IDSL transmission.
B.Load coils in the telephone line can prevent any DSL modem from training up to an ATU-C port.
C.Load coils cause low upstream rates, but do not degrade downstream rates.
D.Load coils cause low downstream rates, but do not degrade upstream rates.
E.Load coils cause low trained rates for SDSL, SHDSL, or IDSL, but do not degrade ADSL (CAP or DMT) transmission.
Correct:B
QUESTION NO: 4
Three of the following are common symptoms of a bridge tap ("half tap") on a DSL line. Which three are symptoms that result from placing a bride tap on a DSL line?
A.The line may not train.
B.The DSL service will interfere with telephone (POTS) service on the same line.
C.DSL line rates will be lower than expected (lower than provisioned).
D.The line may have degraded DSL service, but POTS service may appear normal.
Correct:A C D
QUESTION NO: 5
A DSL customer has subscribed to a service that provides 2 mbps downstream and 256 kbps upstream. The cable length is 10 kft (3 km). The customer reports that file transfers on the DSL line seem slower than normal in recent days. After reviewing the DSL profile parameters for the
DSL port, and the actual status of the line, what is the possible reason why the subscriber's data rates are slower than usual?DSLAM#show dsl int atm 1/1DMT profile parametersMaximum
Bitrates:Interleave Path: downstream: 2048 kb/s, upstream: 256 kb/sFast Path: downstream: 0 kb/s, upstream: 0 kb/sMinimum Bitrates:Interleave Path: downstream: 0 kb/s, upstream: 0 kb/sFast Path: downstream: 0 kb/s, upstream: 0 kb/sMargin: downstream: 6 dB, upstream: 6 dBInterleaving Delay: downstream: 16000 usecs, upstream: 16000 usecsCheck Bytes
(FEC):Interleave Path: downstream: 16, upstream: 16Fast Path: downstream: 0, upstream: 0R-S
Codeword Size: downstream: auto, upstream: autoTrellis Coding: DisabledOverhead Framing:
Mode 3Operating Mode: AutomaticTraining Mode: QuickMinrate blocking: DisabledSNR
Monitoring: DisabledStatus:Bitrates:Interleave Path: downstream: 640 kb/s, upstream: 256 kb/sFast Path: downstream: 0 kb/s, upstream: 0 kb/sMargin: downstream: 6 dB, upstream: 9 dBAttenuation: downstream: 45 dB, upstream: 31 dBInterleave Delay: downstream: 16000 usecs, upstream: 16000 usecTransmit Power: downstream: 19.4 dB, upstream: 12.0 dBCheck Bytes
(FEC):Interleave Path: downstream: 16, upstream: 16Fast Path: downstream: 0, upstream: 0R-S
Codeword Size: downstream: 1, upstream: 8Trellis Coding: Not In UseOverhead Framing: Mode
3Line Fault: NONEOperating Mode: ITU G dmt Issue 1Line Type: Interleaved Only
A.The signal-to-noise margin on the line will not allow downstream DSL rates faster than 640 kbps. If the subscriber's service was in fact faster at some time, then something has changed in the line characteristics or noise spectrum.
B.The subscriber is provisioned for 640 kbps downstream, and the service appears to be working normally. The problem is apparently not related to the DSL (physical layer) part of the service.
C.The service is running in G.DMT, and 640 kbps is normal for the subscriber's cable length. Change the mode to ANSI T1.413 for faster rates.
D.The DSL profile is set for 16 milliseconds interleave delay. Change the interleave delay to 0, or change the profile to fastpath for faster line rates.
Correct:A
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Updated: May 27, 2022