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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Overview of LTE Cellular Interfaces

Overview of LTE Cellular Interfaces

This section describes the definition, type, and purpose of LTE Cellular Interfaces.

Definition

Long Term Evolution (LTE) is a standard developed by the 3rd Generation Partnership Project (3GPP) for the Universal Mobile Telecommunications System (UMTS).

LTE is improvement over 3G technology, but not equal to 4G technology. LTE is a transition from 3G to 4G technology. Compared with 3G technology, LTE has the following technical advantages:

  • Higher data transmission rate: LTE provides a downstream peak rate of 100 Mbit/s and an upstream peak rate of 50 Mbit/s over a 20 MHz bandwidth.
  • Improved spectrum efficiency.
  • Increased network deployment flexibility: LTE supports bandwidth ranging from 1.25 MHz to 20 MHz.
  • QoS guarantee: The LTE system design and strict QoS mechanism ensure better QoS for delay-sensitive services such as voice over Internet Protocol (VoIP).
  • Shorter delay on wireless networks.
  • Higher cell edge bit rate: The high bit rate delivers higher performance for users located on the cell edge.
  • Backward compatible: LTE offers compatibility between the existing 3G system and non-3GPP systems.

An LTE cellular interface is a physical interface supporting Long Term Evolution (LTE) technology. Compared with 3G technology, LTE technology provides enterprises with the high-bandwidth wireless WAN access service.

Type

LTE hardware includes the LTE interface card, and LTE model. The device equipped with the LTE interface card provides LTE cellular interfaces, and LTE models have LTE cellular interfaces. The LTE interface card, and LTE model have built-in LTE modem. An LTE cellular interface manages an LTE modem. The LTE cellular interface uses an LTE modem for wireless data transmission at the physical layer, PPP or Wireless Wide Area Network (WWAN) at the data link layer, and IP at the network layer.

The device supports the following LTE cellular interface types:

  • On the AR1200 series (Except AR1220C), AR2200 series (Except AR2201-48FE and AR2202-48FE), AR3200 series, and AR3600 series, an LTE cellular interface can provided by 1LTE-L, 1LTE-LV, and 1LTEC interface cards.
  • The device name with L can support LTE interface.

In addition, the LTE cellular interface provided by an 1LTE-L interface card can be configured with two LTE channel interfaces numbered 1 and 2.

NOTE:

LTE includes the time division long term evolution (TD-LTE) and frequency-division duplex long term evolution (FDD-LTE). Among LTE networks, LTE cellular interfaces can only connect to FDD-LTE and TD-LTE networks. Among 3G networks, LTE cellular interfaces can only connect to GSM, WCDMA and TD-SCDMA networks, not CDMA2000 networks.

Purpose

LTE technology deployed on routers provides wireless access and interconnection for enterprise branches or small- and medium-sized enterprises. Compared with 3G technology, LTE technology provides higher bandwidth on wireless WAN links to transmit more voice, data, and video services for enterprise users.

Enterprises can use LTE technology to replace or back up wired WAN links such as Ethernet, digital subscriber line (DSL), frame relay (FR), and integrated services digital network (ISDN) links. LTE allows flexible, efficient, and fast network deployment, and provides a backup for wired WAN links on an enterprise network.

Benefits

LTE technology brings users the following benefits:

  • Wired WAN link backup: LTE technology backs up wired links such as Ethernet and DSL, ensuring uninterrupted services if the wired links fail.
  • Flexible, efficient, and fast network deployment: LTE technology provides service coverage even in remote areas and mobile office scenarios.
  • Secure virtual private network (VPN) access: An enterprise branch can set up a tunnel with the enterprise headquarters on LTE links using VPN technologies, such as Generic Routing Encapsulation (GRE), Layer 2 Tunneling Protocol (L2TP), or Internet Protocol Security (IPSec) VPN. This tunnel allows the enterprise branch to communicate with the headquarters in a fast, secure, and efficient way.
  • Data services and multimedia services: LTE allows a router to connect to different gateways using different access point names (APNs). For example, the router can use one APN to access the Internet, and another APN to access the IP multimedia subsystem (IMS). QoS settings on the router can be configured to control the quality of data and multimedia services on the router.

Limitations

Due to limitations in wireless transmission, LTE may be limited in terms of throughput, delay, and customer requirements:

  • Throughput: varies depending on the number of active users and network congestion. This is a common limitation of wireless networks.
  • Delay: varies depending on the quality of network services provided by carriers and may increase due to network congestion. Compared with wired networks, wireless networks may cause longer delays.
  • Carriers may pose other limitations on LTE.
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Updated: 2019-03-06

Document ID: EDOC1100069331

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