Backgrounds :
The internet infrastructure is relatively weak in Asian Countries, including Cambodia. Out of those many, Cambodian company, WiCAM which is wired/wireless Internet Service Provider(ISP) required high-speed and good quality internet service for the business operations without much investment cost. Due to radio interference and service stability of the existing wireless service based on WiFi Technology, WiCAM has tried to find an alternative way out. In order to solve this problem, WiCAM connected with newly laid copper line and NexComm solution which is utilizing Symmetric High Speed Digital Subscriber Loop(SHDSL), transmission technology

Business Case :
The existing services of wired internet connections in Cambodia was being provided by utilizing an expensive TDM Network same as other Asian countries. In other words, E1 signals, which is transmitted from SONET/SDH network, was being provided through DSU/CSU Modem and separate router. This was such an expensive solution connected to subscriber’s routers, which was provided by E1 private line service of Cambodian government-run Telecom Operator, Telecom Cambodia.
WiCAM has its own international satellite connection through Singapore as well as few E1 internet connections all the way from the Vietnamese IXC. Therefore, WiCAM had no other concerns but securing the number of subscriber lines between those routers and the subscribers. WiCAM Chairman Mr.Chanthol has come to an idea about efficient DSL service which he has leaned during his staying in the U.S.A. Although the common broadband DSL service most of us are familiar with is ADSL. However, the idea of symmetrical services, required for enterprises, occurred to Mr.Chanthol and he has come to the conclusion that SHDSL is the most suitable alternative solution.

However, the capital of Cambodia, Phnom Penh where WiCAM is located is with copper infrastructure merely about 6,000 lines and old telephone switches offered by more advanced countries that is limited to cover the increasing demand. Therefore, WiCAM has decided to lay the new copper infrastructure by itself considering the fact that it was such a small city.
Phnom Penh with a 5-mile radius is the most suitable city for the Metro Ethernet Network that utilizes metro Ethernet switches. Until now, WiCAM provide approximately 40 clients with NexComm’s NS4024 SHDSL Ethernet Switch with 24 ports capacity, NBG420 modem at the rate of 2.3 Mps and NBG440 which enables the high speed internet service at the rate of 4.6Mbps by using two telephone wires.

Diagram 1. Conventional network configuration for leased line service

Diagram2. Newly deployed network configuration of SHDSL broad band service

Diagram 3. Comparison of traffic efficiency of leased line service and SHDSL Service

Future Plan:
Currently, the core network WiCAM has is a basically Metro Ethernet Network (MEN). But in order to provide Metro Ethernet Service defined by Metro Ethernet Forum( MEF), next generation equipments has to be installed in order to support such functions in their core network. NexComm’s SHDSL Ethernet over copper equipments which is used in the WiCAM’s network are already featured with VLAN and QoS functions for QoS services which will be compatible with the next generation equipments. Therefore, WiCAM does not have to make any further investment in their Access Network.

Proposals:
When Incumbent Service Provider(ILEC) or Alternative Service providers(CLEC/AO) in Cambodia, that do not have telecom infrastructure for Ethernet Services, configure their Access network utilizing existing telephone lines as WiCAM’s case, they can provide broadband service with sufficient bandwidth and enhanced features to almost all enterprises and institutions even before making full investment of NGN with fiber network. Therefore, for the time being, the most economic way to approach next generation service platform is to make use of copper infrastructure and Ethernet over Copper solution.