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Figure 9-3: Architecture of the ISDN interface The packet-switching access is not universally implemented, but it permits access to the worldwide X25 packet-switching network The telemetry system access is also generally unimplemented Several telemetry experiments have been done in Europe and in the US, but few resulted in a cost-effective solution We may have to wait for new lower-cost technology The concepts, discussed in the following paragraphs, are sound ones The higher-layer services could be almost anything A typical example might be video conferencing Here the higher-layer services would be the functions of the Codec If the ISDN B channels are used for Internet access, then IP would be the network services and TCP, HTTP, and so on would be the higher-layer services The B and D channels are then just timeslots on the bus that can be grabbed by any of the connected devices The trick is how the telephone, for example, keeps the computer from grabbing its timeslot while it is off hook The answer lies in the 48 KB/s of overhead In this 48 KB/s, the NT1 provides timing to all the devices on the bus Remember this is a bidirectional channel, so there is 48 KB/s of overhead going back as well The station that wants to grab the D channel effectively puts its address in the contention slot in the 48 KB/s inbound bus These bits are echoed by the NT1 as a confirmation of success Effectively, the highest address will win since the one bits would overlay any zero bits of a device with a lower address When the terminal sees its address echoed in the outbound overhead channel, it has won the right to send a packet (signaling or otherwise) on the data channel

7:

Figure 7-40 The PPS Planning data entry form appears to the business end users in the familiar Excel interface

If the telephone has signaled the NT1 channel and grabbed a B1 channel, any other device sending a signaling request for that B1 channel will receive a control packet from the NT1 indicating that it is busy Since one B channel is identical to another B channel, the NT1 will theoretically respond with you may use the B2 channel The actual operation depends on the implementation of the NT1 and terminal equipment This can get a little sticky when bonding channels Essentially, bonding (that is, one device using both 64 KB/s channels to get 128 KB/s) must be done at call initiation One of the channels can be dropped during the call, but it can t be re-added later This is because the called end (such as ISP) may have already accepted a call on the other channel The logical question is, why can t it accept a mated or bonded channel on any other channel Although this is a good question, the answer is that when the rebonding takes place, the Telco network treats it like a brand new call Thus, it can be routed via different offices and the timing relationship between the bonded B channels would not be preserved This brings up another interesting issue: Telco implementations vary widely The number of possibilities is nearly limitless Each Telco has chosen to implement a subset of ISDN based on what they think they can sell and still implement at a profit Therefore, there is no such thing as standard ISDN Every implementation is unique

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The previous interface doesn t allow for switching on premises, which would be necessary if there were multiple telephones The European and North American Telephone systems are quite different in operation In North America, extension telephones simply bridge onto the line, or connect in parallel Adding a party to a call or transferring from one extension to another is as simple as picking up one telephone and putting down another In the European system, specific actions (pushing the designated button) are required on the part of the parties to transfer a call This also implies on premise switching

Once the Submit Final action is executed, the contributor user will not be able to make any more changes to the plan data stored on the PPS Planning Server If a reviewer is defined for the assignment, the reviewer will receive e-mail notifications when a contributor submits the data The reviewer can open the assignment just like the contributor opens the assignment by clicking on the link for the assignment in the Assignment pane Towards the lower half of the Assignment pane is a link that says Review or Approve Submissions of this Form Clicking this link will open the Review and Approve Assignments dialog box This box will display all the assignments that are assigned to that user for reviewing The reviewer can select multiple submissions by checking the check box next to each submission in the dialog box There are various options available to the Reviewer under the Actions drop-down box If data modification is enabled for the reviewer, the reviewer will be able to modify the data submitted by the contributor and re-submit it He can also review the submissions with or without any modifications