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ISDN make a separation between user data and voice,in ISDN there are two type of channels, D Channels and B channel, there ability is different, in bandwidth and they have different type of combination, D channel has 16 Kbps bit and it used for controlling, but B channel have 64 Kbps its used for actual transfer of user data many variation of combination between D and B channels but the basic equation where (2B+d) which means too data channel plus one control and that known as BRI (basic Rate Interface) its normally user for home uses, another combination is PRI (Primary Rate Interface) which use more than two B channel plus single D channel this type used for business solution, There are different combination to these channels in most of countries like in Europe they make combination on B+D equivalent to E1(2048)Mbps, in US Equivalent to T1 (1.544 )Mbps, but in OSI this is the responsibility of transport layer to recognize the physical capacity and isolate that from upper layers by making framing to big amount of data to smaller one and put controls to let image transport layer in destination notice that, OSI have seven layer, and all those layer are active instead ISDN is reach only third Layer (network layer), OSI is connection less protocol and it depends in HDLC which is packet protocol technique, instead ISDN built up X.25 which is connection oriented in sense of VC (virtual circuit), ISDN basically make a distinction between user data and voice cause is based on subscriber or telephony system, but OSI make mixture of data stream by using transport layer and it manage to hide the l, in than layer there is a multiplexing process for session layer to make all those distinct process (user application) transfer in one virtual connection and to be controlled via transport layer. ISDN (RM) have thee palnes user managment and control palnes but OSI (RM) have only one planes user palne in ISDN equivelant to signaling use plane in OSI , manament and those are the basic deference's
RM= Reference Model.
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Which layer of the OSI model does ISDN Q921 operate?
data link
Which body is responsible for ISDN?
what osi layer is responsible for routing, message fragmentation, and reasembly
Which OSI model layer is responsible for the termination of connections between hosts?
There are in total seven layers in OSI model . OSI model layer that is responsible for the termination of connections between hosts is session layer . Session layer is responsible for the dialog control .
Difference between ATM reference model and OSI model?
osi modal is deovaped by iso company it has 7 layers but ATM modal has a 4 layers osi modal have a physical layer,datalink layer,network layer, trasport layer, session layer, perastion layer, application layer, but
Which layer of the OSI model creates a virtual circuit between hosts?
layer 4 - transport layer
In which layer of osi model dose repeater works?
It depends on what kind of model it is, but in the model for computer 321O, it is on the layer between trhe keyboard and the behind screen, and there is a button with the osi code and there says everything.
What layer in the OSI model covers routing between networks?
The INTERNET LAYER of OSI model exists for "routing" and providing a single network interface to the upper layers.
Which osi layer is application?
OSI stands for Open system interconnection model. Application layer is the seventh layer in OSI model.
Which OSI layer addressing is required to route packets between two networks?
layer 3
What OSI layer standardizes the data formats between systems?
presentation layer is used
What is difference between application layer and application software?
Application layer is a component of the OSI model of computer communication. Application software is programs that run on computers so that you can "do something" such as write a document.
Which OSI model layer is responsible for keeping open a communications path between?
data link layer
