LG Telephone Systems

What is Quality of Service (QoS)?

Quality of Service is a way of providing a better service to different 'classes' or types of traffic on a Network. You could think of QoS as a bus route in London, as only one type of traffic is allowed in the lane thereby improving its reliability and speed of service. On an IP Network you will have many devices and services all trying to send information along the same routes at the same time and you need some way of prioritising your telephone calls ahead of other non-critical traffic. 

Quality of Service usually looks at a number of factors :


The rate at which traffic is carried by the network.


The delay in data transmission from source to destination.


The variation in latency.


The percentage of packets discarded by a router.

QoS not only involves a robustly working VoIP system, it also includes the network in which that system is running. In addition, there are many other factors and situations affecting the quality of service. If the bandwidth is not sufficient, the network is not properly set up or other such factors outside the VoIP system do not function properly, it is very difficult to achieve good quality of voice.

The IPECS Platform actively guards against a poor Quality of Service by implementing a number of technologies to assist in building a reliable, voice quality Network. These technologies include:


  • VLAN Tagging  (802.1p/Q)
  • DSCP (DiffServe Code Point)
  • IP ToS (Type of Service Scheduling) 
  • UDP Port Service Scheduling

What are the ways I can install a Call Server or Gateway?

Option 1: 
The usual 19" Rack Mount
An IPECS cabinet can be mounted in a standard 19" rack allowing up to 10 modules to be neatly incorporated into a single cabinet occupying 9U of space including the top power supply unit. The additional Single Line Telephone Module, which allows connection of 32 analogue extensions can also be included in the rack and occupies an additional 2U.

Option 2: 

The Desktop MountThe Desktop or Floor mount allows the glass-fronted IPECS cabinet to be floor or desk mounted

Option 3: 

Standard System Wall MountSystem Wall Mount

Option 4: 

Module Wall MountModules can be wall mounted on individual mounting brackets allowing you to install the module in a very small area close to the facility the module connects to. This is especially useful for placing modules by incoming line points and where user groups are located using the LDP-7000 Series telephones which require an interface module.

Option 5: 

Book End MountBook MountThe book end mount system allows you to group modules into a small space for placing on a desk or shelf. The modules have been designed to link together and to the book ends to form a solid block, much like lego bricks. This configuration is ideal for installations in branch offices where space is a major consideration and the infrastructure of a normal main office is unavailable.