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BT Technology Journal 16, — Download citation. Issue Date : April Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article. Maintain smaller code size when using both NT- and TE-side code, due to reuse of core elements for both network- and terminal-side.

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Processor-independence - enables mobility across CPU platforms. Simple state machine design - easy to understand and change code for national specific variants. Consult with our experienced engineers early to avoid expensive pitfalls later. Faster debugging Specific defined constants, comment strings and variable naming - supports use of text search techniques to quickly locate a specific section of code and determine the side effects of changes that are being considered.

ITU-T primitives and software structure - clear traceable dataflow. With a Dial Backup service, the backup circuit inherits the protocols of the primary circuit when the primary goes down. Once the primary comes back up, the secondary is taken down. One router is always configured as the master which initiates the call and the other as a slave , this saves a busy line being detected as both routers try and call each other at the same time.

A Dial on Demand circuit can be activated when the router sends data, or according to a daily schedule or you force a dial. Ports in a Demand Pool must be on the same slot and a Demand circuit can only be associated with one pool although a backup Pool can be configured.

The PPP Multilink Protocol MP allows a number of small bandwidth circuits to be aggregated into larger ones when traffic is heavy, thereby making cost effective use of dial or ISDN lines and paying for only what is used.

A Multilink circuit is called a Bundle and can contain up to four links, the MP process adds a header, with a sequence number, to the packet, and sends the packet down the fastest link in the bundle. Processes such as Wellfleet Compression Protocol WCP compresses the packet if it is enabled , and then the packet is uncompressed at the other end and resequenced. There are two types of line within a bundle; an Initial Line, used initially for data transfer; and a Secondary line which comes into play when the initial line becomes congested.

In a point to point link, one of the routers is configured as a Congestion Monitor which measures percentage utilisation of the links. Thresholds for percentage utilisation and sampling periods can be set on the router to determine at what stage extra links are brought into the bundle.

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