A Digital Leased Line (VLL) company is a issue-to-level information conversation using ADSL community (more than ATM) for communicating any details involving two internet sites. The data pace of VLL depends on buyer specifications such as 64, 128, 256, 512 Kbps.
In genuine community, many buyers are connected to DSLAM on top of that, the assistance provider assigns the VLL ratio for bandwidth sharing, when just about every consumer sends facts simultaneously. This is a downside of VLL assistance when in contrast with Leased line (LL) services. For the latter provider, it can use a entire bandwidth which is not shared with other buyers. The reward of a VLL service is that it is cheaper than a LL services.
The basic VLL configuration is demonstrated in the diagram underneath.
Laptop-A –> ADSL Router-A –> DSLAM-A –> ATM Swap-A —>ATM-Switch-B –> DSLAM-B –> ADSL Router-B –> Computer-B
From this diagram, the VLL configuration is divided into two websites : the provider web site and the customer site. In the provider supplier, there are two DSLAMs (Digital Subscriber Line Entry Multiplexer) and two ATM switches for transmitting and getting any knowledge traffic between two buyer internet sites. DSLAM is employed for combining info signal from numerous buyers and then sends info to ATM change. Following acquiring facts from DSLAM, ATM switch queries the greatest route routinely to the other website by only configuring VPI / VCI parameters at the DSLAM link and ATM swap relationship. At DSLAM’s spot side (closing to ATM-SW), the VPI / VCI of DSLAM-A ought to be the very same as ATM SW-A’s, and the VPI/VCI of DSLAM-B ought to be the similar as ATM SW-B’s.
In each individual consumer internet site, there are an ADSL Router and do the job stations (a server, a Personal computer, or other LAN gear). Prospects have to configure their ADSL routers in VLL manner by setting the relationship variety to “RFC1483 Route”. At DSLAM’s source facet (closing to ADSL Router), the VPI / VCI of DSLAM-A ought to be the identical as ADSL Router-A’s, and the VPI/VCI of DSLAM-B ought to be the same as ADSL Router-B’s. These parameter values rely on each telecommunication provider’s assignment.
