Firstcall Teleservices Interview Questions and Answers

Each generation of mobile networks has different spectrum and data rates.

• 2G networks operate in the 900 MHz and 1800 MHz frequency bands with data rates up to 384 kbps.

• 3G networks use a variety of frequency bands, including 850 MHz, 900 MHz, 1900 MHz, and 2100 MHz, with data rates up to 2 Mbps.

• 4G networks operate in the 700 MHz, 800 MHz, 1800 MHz, 2100 MHz, 2300 MHz, 2500 MHz, and 2600 MHz frequency bands with data rates up to 100 Mbps or higher.

The architecture of 2G/3G/4G networks involves multiple layers and components for communication and data transfer.

• 2G architecture includes Base Station Subsystem (BSS), Mobile Switching Center (MSC), and Home Location Register (HLR).

• 3G architecture includes Node B, Radio Network Controller (RNC), and Serving GPRS Support Node (SGSN).

• 4G architecture includes Evolved Node B (eNodeB), Mobility Management Entity (MME), and Serving Gateway (SGW).

• Each generation introduces new tech...read more

Routers and switches are network devices that operate at different layers of the OSI model. They have different functions and use different protocols and configuration commands.

• Routers operate at the network layer (Layer 3) and are responsible for forwarding data packets between networks.

• Switches operate at the data link layer (Layer 2) and are responsible for forwarding data frames within a network.

• Routers use routing protocols such as OSPF, BGP, and RIP to determine the bes...read more

Handover is the process of transferring responsibility from one person or team to another. There are two types: internal and external handover.

• Handover is the transfer of responsibility from one person or team to another.

• Internal handover occurs within the same organization or department.

• External handover involves transferring responsibility to a different organization or department.

• Examples of handover include passing on a project from one project manager to another, transit...read more

VoLTE stands for Voice over LTE, which enables voice calls over a 4G LTE network. ViLTE stands for Video over LTE, which enables video calls over a 4G LTE network.

• VoLTE enables voice calls over a 4G LTE network

• ViLTE enables video calls over a 4G LTE network

• VoLTE and ViLTE both utilize the 4G LTE network for communication

• VoLTE and ViLTE provide higher quality and faster call setup compared to traditional voice and video calls

• Examples of VoLTE and ViLTE services include HD voic...read more

Call flow in GSM refers to the sequence of events that occur during a phone call in a GSM network.

• The call is initiated by the caller and a request is sent to the nearest base station.

• The base station sends the request to the Mobile Switching Center (MSC) which then routes the call to the recipient's network.

• The recipient's network sends a signal to their phone to alert them of the incoming call.

• If the recipient answers, the call is established and the two parties can communi...read more

Modulation techniques are methods used to encode information onto a carrier signal for transmission.

• Modulation techniques are used in various communication systems.

• Some common modulation techniques include amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM).

• AM modulates the amplitude of the carrier signal to encode information.

• FM modulates the frequency of the carrier signal to encode information.

• PM modulates the phase of the carrier signal to enco...read more