ISDN (Integrated Services Digital Network) is an Integrated Services Digital Network (ISDN) that integrates voice, data, and image transmissions. It, unlike the conventional standard analog telephone network, is a fully digital network. It is known that digital communication channels are much less susceptible to various interference, which provides excellent quality of communication. Such a connection is better protected from electrical noise and difficult to access for listening devices. An ISDN network provides integrated services, that is, allows you to transfer voice, data, and even video over the same network. Thus, instead of three different systems – a telephone network, dedicated lines for data transmission and industrial television – one is enough! Modern ISDN phones provide impeccable voice communication (you can even hear the breath of your interlocutor!), Have a developed set of service functions. In addition, there are many different ISDN equipment, for example, video telephones allow you to organize video conferences, and ISDN cards provide access to the Internet at speeds up to 128 Kbps. The big advantage of ISDN technology is that it allows you to have at least two telephone numbers on one telephone line. If you need to quickly deploy a corporate network, then ISDN is your choice. It is only necessary to purchase equipment and switch existing lines, connections to the analog telephone network, to digital ones, which can be done by any modern PBX (learn details from your telecom operator). In the case of relocation, you only need to arrange the transfer of the connection from the operator (in the same way as the phone number is transferred). In addition, the ISDN network provides many Additional Service Types (DVOs), many of which are unavailable to subscribers of ordinary telephone lines.
What will ISDN bring to you? Fast establishment of high-quality connection, higher bandwidth up to 128 kbps, several subscriber numbers on one telephone line and the ability to use additional types of service (DVO).
Why does ISDN use the existing telephone network on copper wires as a transmission path? From the existing network of the telephone network can not be abandoned due to large investments in it in the past. Replacing copper wires with optical cables is possible only for a fairly long period of time.
– Do you need any changes to the network if you want to become an ISDN user?
– No changes needed! The subscriber is mounted a small block of NT and that’s it!
ISDN Access Types
ISDN standards define two exchange interfaces: BRI and PRI.
For basic access (BRI, Basic Rate Interface) to the ISDN network, a standard line (pair of copper wires) is used. It is this access that is intended for small companies and home users, while ONE telephone line you can LEAD TWO TALKS IN ONE-TIME, or you can talk while working ON-TIME on the Internet!
The basic network access interface (Basic Rate Interface, BRI) consists of three separate channels – two main conversational (reference) channels (bearer channel, or B-channel) and one data channel (D-channel), therefore it is designated as 2B + D. Each channel “B” has a speed of 64 Kbps, and the channel “D” – 16 Kbps. Channels “B” are intended to transmit voice or data (when accessing the Internet).
The primary access interface (PRI, Primary Rate Interface) consists of 30 channels “B” at 64 kbit / s and one channel “D”, also at 64 kbit / s. As in the previous case, channels “B” are for data transmission, and channel “D” is for service information.
Primary access is mainly intended for connection to the telephone network of medium and large organizations, business centers and
Consider the basic access to the ISDN BRI network.
At the PBX, the telephone line is switched to work in ISDN digital mode. The subscriber has a network termination (network terminal) NT1 for the base (BRI) connection to the ISDN network. Network termination is designed to convert the signals of a linear two-wire U-interface telephone line into signals of a four-wire S-interface, to which you can connect up to 8 ISDN devices, such as ISDN phones, video telephones, fax machines, modems and
You can connect various digital ISDN terminals to the S0 bus, for example: Swisscom Top D300 ISDDN phones, TRITEL 200i DECT, Rubin 40 with answering machine, Rubin 30, TELCO PH-530 for receiving quality telephone services, Leadtek TeleVyou 511 videophone for videotelephony (you can not only hear, but also see your interlocutor!), ISDN PCI card Planet 128k T / A ISDN card to access the Internet at 64 or 128 Kbps and
Is it possible to use standard devices on the ISDN line such as:
ordinary analog telephone, regular fax G3, analog modem, answering machine, radiotelephone, DECT telephone?
To do this, simply install the NT1 + 2ab network termination, which, in addition to digital ISDN terminals, also allows you to connect two standard analog terminals (
The network terminal NT1 + 2ab, in addition to the S-bus interface, has an additional two a / b outputs for connecting analog devices. With this connection option, you can use any digital or analog telephone sets, as well as work on the Internet using an external ISDN PCI Planet 128k T / A ISDN card. You can have two telephone conversations at the same time using digital or analog telephones, fax and
The disadvantage of this option of Internet access is the need to use an external PCI card, which is not always possible, since it requires a free PCI slot in your computer, which may not be at all (for example, if you use a laptop). In addition, the system unit of your computer may be sealed (for example, in accordance with the terms of the warranty).
Is it possible to work on the Internet without installing an external PCI card?
Yes of course! There is an all-in-one network terminal NT1 + Multi&# 184; which, in addition to S0 interfaces and two a / b ports, has an additional RS-232 interface (COM port) and USB, specifically designed for connecting a network termination to a computer. This ensures the convenience of working in the Internet, data transfer, and, in addition, the configuration of the device is greatly facilitated. You can also connect the mini-PBX to the analog ports of the network termination NT1 + Multi, NT1 + 2ab and use all the advantages of ISDN technology for organizing telephone communications in a small office.
It is better to see once, than hundred times to hear the interlocutor. And the use of videoconferencing in management, medicine, security systems, and many other areas brings tremendous benefits. Of course, even a videophone will never replace personal communication, but it does allow to achieve a fundamentally new level of communication between people, sometimes separated by many thousands of kilometers. Indeed, according to well-known studies, only a tenth of the information can be transmitted during a telephone conversation. And in the case when there is an opportunity to follow the gesticulation and mimic of the interlocutor, the efficiency of information transfer reaches 60%. Managers of companies that already use videoconferencing believe that videoconferencing systems drastically reduce the time and financial costs of traveling for their employees and make ongoing meetings more productive. Video telephony is a technology that allows people to see and hear each other, share data and collaborate on them interactively. To do this, two important conditions must be met: you and your interlocutor must have videophones installed (for example, TeleVyou 511 or BVP 8770) and a corresponding communication line (ISDN if you use the TeleVyou 511 videophone or BVP 8770 videophone) on which information is transmitted, must be sufficiently speedy,
What do you need to use videophone connection?
First of all, you must have a videophone with you and your interlocutor. It is not necessary that both videophones are of the same name, it is enough that both terminals comply with accepted standards and recommendations (
Can I use a videophone to communicate with a regular phone?
Yes of course! You can call from a videophone to a regular phone and from a regular phone you can, of course, call a videophone. Of course, with such a call you will not be able to see your interlocutor, but otherwise everything happens the same way as with a regular telephone call.
What equipment is needed for video telephony?
If you and your partners have an ISDN line – it is enough for each of them to install any of the ISDN network terminations (NTBA, NT1 + 2ab, NT1 + Multi) and the TeleVyou 511 videophone and that’s it! Now you can just call your interlocutor and see him! No additional hardware required!
Description of Additional Service Types (VAS) for ISDN
The telephone exchange software allows the ISDN subscriber to use data services and additional services (DVO). A brief description of some of the additional services provided to subscribers of the ISDN network can be found below (Attention! Not all telephone service providers support a full list of additional services, therefore check the full list of additional ISDN services from your telecom operator).
Call Forwarding Busy (Call Forwarding Busy) If your phone is busy with a call, the new call is redirected to another phone number (which you specify). The service can be managed either by the operator at the station or by you. If the service is managed by you, you can activate or deactivate the service yourself, while entering the number you need each time.
Call Forwarding No Reply The service is simple: they call you. You cannot answer due to certain reasons and after several calls (calls), the call is redirected to the phone that you specify in advance. The service can be managed either by the operator at the station or by you. If the service is managed by you, then you can activate or deactivate the service yourself, while entering a new number each time.
Multiple Subscriber Numbering The carrier can assign up to three telephone numbers for each ISDN line,
unconditional call transfer (Call Forwarding Unconditional (CFU)) If this function is enabled, then every call that arrives at your phone number is transferred not to you, but to the number you chose when you turned on this service. You can use this feature, for example, to forward all calls from your home phone to the office (or vice versa). The service can be managed either by the operator at the station or by you. If the service is managed by you, you can activate or deactivate the service yourself, while entering the number you need each time.
call forwarding in case of busy (Call Forwarding Busy (CFB)) This service works the same way as CFU, and call forwarding is done only when your number is busy. You can use this function, for example, when you have two phone numbers (one in the office and one at home) and if your first number is often busy (with calls from your daughter or another person), but you still want to receive all calls, coming to your first number. The service can be managed either by the operator at the station or by you. If the service is managed by you, you can activate or deactivate the service yourself, while entering the number you need each time.
Call forwarding in case of unavailability (Call forward no reply (CFNR)) This service works in the same way as CFU, and call forwarding occurs only when no one picks up the phone and the phone has already called for about 20 seconds (depending on the PBX mode Your carrier). This service can be used as CFU, but it also allows you to receive a call if you are in the vicinity of the telephone.
Caller Number Identification (Calling Line Identification Presentation (CLIP)) There are three services associated with calling line identification: Caller Number Identification. The availability of this type of service ensures that the information about the caller’s number is always provided, except for the case when the CLIR service is installed on the caller.
Calling-Line Identification Restriction (CLIR) This service provides the caller with the ability to keep his or her number secret from the called party, regardless of whether the called party has CLIP services.
Connected Line Identification Presentation (COLP) presentation The caller cannot be sure that he is connected to the subscriber whose number he dialed,
Connected Line Identification Restriction (COLR)) This type of service gives the called subscriber the opportunity to keep his number secret from the caller, regardless of whether he has a connected CLIP and COLP service. In the presence of the considered DVO at the called subscriber, the calling subscriber will not be provided with information about the number actually connected.
call hold (broker) (Call Hold) If you are currently in a telephone conversation and you want to contact the second caller by phone without completing your first call, you can interrupt your conversation to start a second conversation.
Call Waiting The service is simple. You are talking, but they are calling you at this time. A special sound signal is heard in the handset, and the telephone number is displayed on the telephone display (if you have the CLIP service activated). Now you can either switch to a waiting call (by ending or not ending the first call), or you can reject an incoming call.
Explicit call transfer If you have activated this service, you can answer another call that was made to you during a call without breaking the connection with subscriber A, and then establish a direct connection between the subscribers and C, and you disconnect from your two interlocutors and your phone is free again.
Incoming Call Barring The service prohibits all incoming calls. When activating this service, any user who connects to the subscriber (with the specified service) will receive the message: "The number can not be called temporarily.".
Outgoing call barring Depending on the services provided by your service provider, you can bar certain outgoing calls,
Callback in case of busy (Completion of calls to Busy Subscribers (CCBS)) If you have this service enabled and you call someone who is already talking on the phone at the moment, then a special “busy” tone is heard. This signal sounds like a typical busy signal combined with short beeps. If you just hang up, nothing else happens. But within 10 seconds after this special beep was heard, you can request a callback. When the subscriber is free, your carrier will now inform you about this with a special CCBS beep.
Malicious Call Identification (MCID) This service allows the subscriber to request the PBX to identify and register the phone number from which the incoming call was made. The service makes it possible to determine the following data: the time and date of the call, the PBX number to which the caller is connected; If the calling subscriber belongs to his own PBX, his list number is determined. The service is registered by the station operator at the request of the subscriber.
Terminal portability (Terminal portability (TP)) If this function is offered by your telecom operator, it allows you to replace the terminal during a call or switch to another phone connected to your NT1 network termination (network terminal). For example: You can pause a conversation from one phone, switch to another, and resume a conversation from it; You can pause the conversation from the telephone and resume the conversation from a fax connected instead of the telephone.
three-party conference (Three party service (3PTY)) This service is a continuation of the Call Waiting service. A connection is established between subscriber B (with the ordered service) and subscriber A (it can be established from either side). During the conversation, Subscriber B has the opportunity to establish a connection with Subscriber C, without breaking an already existing connection, and then organize a conference for subscribers A, B and C.
user to user signaling (UUS)) This DVO allows subscribers to exchange small information blocks during the connection process. These blocks are made out in the form of small data packets and are sent from the terminal via the D-channel to the PBX, then via the ISDN network to the PBX and via the D-channel to another terminal. The size of the information block is limited as follows: no more than 40 bytes when the block is included in the standard message; no more than 128 bytes when the block is included in a special message. For successful exchange of blocks of additional information, the terminals must support the function of generating and receiving such blocks. If the terminal receiving additional information does not support the corresponding function and does not display the received information, then no message notifying the subscriber who sent the information block will be transmitted.
Closed User Groups The Closed User Group allows users to form groups to which and / or from which access is restricted.
Wake-up call If you do not have an alarm clock, you can use the wake-up service, while your phone will zonit at the time you specify.
call with fixed address, immediate (Fixed Destination Call) This DVO allows the subscriber to immediately connect to a pre-specified phone number. The service is controlled by the station operator (you just pick up the phone and immediately connect to the called party.)
Hotline number If this function is turned on, then after you pick up the handset and press any numeric key of your phone, this number you have previously programmed is automatically dialed. Please note that if this feature is enabled, you cannot dial the number in the usual way.
Meet-Me-Conference (MMC) Additional MMS service allows the user to agree to call two or more participants. During the active conference period, participants use a special number to access the conference call. Such an opportunity can be used to organize a telephone meeting of a large number of participants at the appointed time. In this case, all participants first need to report only the meeting time and the telephone number used (most often abbreviated). The conference initiator (the user of this service) has the opportunity to observe on the display of his terminal the telephone numbers of participants connecting to the conference call, as well as receive a warning acoustic signal when each new correspondent is connected.
conference conference extension The CONF supplementary service allows the user to participate in a simultaneous connection, including several users, and in the management of this connection. This service allows the user – the initiator of a conference call on his own initiative (dialing the telephone number of the required subscriber) to connect new participants to the conference. In addition, there is the possibility of selective disconnection of interlocutors at the initiative of the initiator of the conference, and at the initiative of any of the correspondents. By ordering this service from the keyboard and dialing several phone numbers, you can quickly arrange a telephone meeting.
Adding Of Tariff Pulses (Advice Of Charging (AOC-D)) This service allows the calling subscriber to receive information about the billing of the current connection. To successfully receive billing information, the terminal must support this function. There are several options for this DVO: Notification of charging in the connection establishment phase (advice of charge at call setup time). This option allows the user to receive information on how the connection will be charged (the number of charging pulses, the period of adding pulses and
Abbreviation Name Description 2B + D An ISDN channel with a base rate that includes two channels B and one channel D in the combined (multiplexed) stream. 2B1Q The encoding method used in the U interface between NT1 and the ISDN switch. Represents 2 bits (binary digits) (2B), encoded in one quaternary character (1Q). This method is used by most equipment suppliers. 4В3Т Encoding method used in the U-interface between NT1 and ISDN switch. It is 4 bits (binary digits) (4B), encoded in 3 tertiary characters (3T). 30V + D ISDN channel with primary PRI (E1) transmission speed, 2.048 Mbps transmission speed (Europe, Asia, Africa, South America and
Proftelecom – What is ISDN? Types of access ISDN. ISDN standards – BRI and PRI. ISDN (Integrated Services Digital Network) is an Integrated Services Digital Network (ISDN) that integrates voice, data, and image transmissions.
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