CTA Broadband & Access Network Technologies 2

Question 1

Which passive optical network (PON) standard is most widely deployed for fiber-to-the-home (FTTH) services?

Accepted Answer

GPON (Gigabit PON)

Answer

GPON (Gigabit Passive Optical Network), defined by ITU-T G.984, is the most widely deployed FTTH standard worldwide due to its high capacity, efficiency, and support for triple-play services.

Question 2

What wavelength is used for downstream transmission in a standard GPON deployment?

Accepted Answer

1490 nm

Answer

In GPON, the 1490 nm wavelength carries downstream (OLT to ONU) traffic, while 1310 nm is used for upstream transmission from the ONU to the OLT.

Question 3

What is the maximum downstream data rate defined in the GPON standard (ITU-T G.984)?

Accepted Answer

2.5 Gbps

Answer

The GPON standard specifies a maximum downstream rate of 2.488 Gbps (approximately 2.5 Gbps) and an upstream rate of 1.244 Gbps.

Question 4

In an FTTx deployment where fiber runs to a street cabinet and existing copper carries the signal to individual homes, which architecture is this?

Accepted Answer

FTTC (Fiber to the Cabinet/Curb)

Answer

FTTC (Fiber to the Cabinet or Curb) runs fiber from the central office to a street cabinet near the customer, then uses existing copper (often VDSL2) for the short remaining distance to the home.

Question 5

What is XG-PON (10G-PON), standardized as ITU-T G.987?

Accepted Answer

A passive optical network standard providing 10 Gbps downstream and 2.5 Gbps upstream

Answer

XG-PON (10-Gigabit-capable PON), defined in ITU-T G.987, delivers 10 Gbps downstream and 2.5 Gbps upstream over the same passive fiber infrastructure used by GPON.

CTA - Certified Telecommunications Analyst Practice Test

CTA - Certified Telecommunications Analyst Practice Test

CTA Broadband & Access Network Technologies 2