ALS must not only be objective and measurable, but also be clear and deliver a result that meets its expectations. Let me give you an example. Suppose an ALS speaks of “high” availability. What is it? A great availability? Availability of 99% seems extremely high. However, 1% of downtime per year means a system can be unavailable for about 3.65 days, or about 1.68 hours per week. Is that in line with expectations? Take a look at this link in which I write about Haviltex. This judgment specifies that, in the declaration of a written agreement, it is not enough to consider only the linguistic meaning of the text, but also to examine the meaning that the parties give to the text and what they can expect from each other. The application of this de Haviltex measure may lead the parties to expect more from each other than what is contained in a written agreement. Due to the resulting uncertainty, it is possible to agree on what is called a comprehensive contractual clause.
It stipulates that the written agreement contains all agreements between the two parties and prevents a declaration other than a linguistic declaration. Shows when a percentage of the requested services were processed. For example, 95% of service requirements are met in 120 seconds. Although availability is important, reliability is considered a key unit, as reliability is closely linked to availability. If a system is available at 90%, it seems to be a nice number. However, if this means that 10% of the data is not available, it indicates low reliability. The user notices most of the response time. The high reaction time makes working with the system a long-term activity and therefore threatens user productivity. It is not uncommon for an internet service provider (or network service provider) to explicitly state its own ALS on its website.
  The U.S. Telecommunications Act of 1996 does not specifically require companies to have ALS, but it does provide a framework for companies to do so in Sections 251 and 252.  Section 252 (c) (1) (“Obligation to Negotiate”) requires incumbent operators to negotiate in good faith matters such as resale and access to rights of way. It is advisable that a contract manager on the client side make good agreements on the level of service immediately after the conclusion of the contractual relationship.