JPS62281594A - Multiple speed multiplex communication system - Google Patents

Abstract

PURPOSE:To set the transmission speed on a multiplex transmission path at every burst by setting a time management frame T seconds on a multiplex line and assigning a time Ki times (i: terminal number) the unit time slot thereof to the every burst signal from a terminal different in a multiplexing speed. CONSTITUTION:The transmission capacity of the multiplex line is defined to be M bit/second and in a node, the time management frame T14 so as to make M.T an integer on the multiplex line 8 is set and a frame synchronizing signal for determining a frame interval is transmitted. A NO. j burst signal 11 from the terminal (i) of the transmission speed (b) multiplexed on the multiplex line 8 synchronizes with the frame synchronizing signal to enhance the bit speed to Nij times for LijXT unit. It is disposed at a constant idle time slot position assigned by the node 18 in the time management frame T14 at every Lij pieces on the multiplex line 8 at every burst signal. As the result of this, the burst signals from the plural different speed terminals can be time division multiplexed and transmitted.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a multiple speed multiplex communication system for multiplexing and transmitting burst signals from different speed terminals.

[Conventional technology]

A multiplexing system in the conventional packet-switched dinotal data transmission system is shown in Figure fPJ1.

Regarding this multiplex transmission system, please refer to the document [S, R6A
m5tutz ff B urst S witch
iB-A n I troduction,”
I E EECom II lunicn, -tion M
agazinC, November, 1983,
pp36=42. It is stated in J.

In other words, 1 and 1' in FIG. 1(a) are the ends! The burst signal from i, here has a transmission rate of 64 kb/s. Here, the burst signal 1 is a 4-byte helag 3,
It consists of 4 j bytes of information and 1 byte trailer 5. The number of bytes of information 4 generally varies depending on each burst signal.

As a method of multiplexing this burst signal onto the 1.544 Mb/s multiplex line 2, a method of multiplexing every 1 byte (8 bits, 125 μs) as shown in the figure has conventionally been used.

Figure 1 (b) is an enlarged display of the part indicated by reference mark A in (a), where 6 is information on 1 byte (8 bif), 125 μs) of the burst signal from the terminal, 71 and 7 □ each represents 7 frames (125 μs, 24 channels).

[Problems to be Solved by the Invention] The conventional multiplexing system as described above has the following problems.

(1) Since the bit rate (physical speed) on multiplex lines is constant, when multiplexing, it is necessary to match the bit rate of the multiplexed signal to the bit rate of the transmission line, and burst signals from low-speed terminals are multiplexed. When converting data into multiplexing systems, it was necessary to match the bit rate of the transmission line, which required a high-performance multiplexing device that operated at high speed.

(2) Since the degree of multiplicity on a single multiplex line is uniquely determined based on the terminal speed, when switching to multiplex lines with different speeds from originating to receiving a call, there is a burst for speed conversion. Signal! Since the product must be multiplied, it is necessary to prepare a memory for this purpose, and an associated signal delay occurs.

(3) When performing multiplexed signal processing, all signals, even those from low-speed terminals, require high-speed processing at the multiplexed speed.

It is an object of the present invention to provide a multi-rate multiplex communication system that can solve the above-mentioned conventional problems.

[Means for solving problems]

According to the invention, the above-mentioned objects are achieved by the means specified in the claims.

That is, in the present invention, seven time management frames T [seconds] are set on a multiplex line, and a time equal to Ni times the unit time slot (i: terminal number) is transmitted from terminals with different multiplexing speeds. The main feature is that the bit rate on the multiplexed transmission path corresponding to the burst signal from each terminal multiplexed in the time management frame is allocated to each burst signal. The difference is that it is not a unique fixed value.

〔Example〕

ptS2 is a diagram showing an embodiment of the multiple speed multiplex communication system of the present invention, in which 8 is a multiplex line, 9 is a slot W filling information field of a time W filling frame on the multiplex line, and 10
is the KIj time slot, and 11 is the NO. from terminal i.
j burst signal, 12 is NO. j +1 burst signal, 13 represents N time slots, and 14 represents a time management frame. Yes, here terminal i
No. from j burst signal 11 is LijXT (seconds)
(depicted as :-: TehaLij = 1), the bit speed is increased by Kij times, and the bit rate is multiplied by M8.
This shows how the signal is multiplexed into the Kij time slot 10 above. Here, for NO, j+1+1 burst message 2 from terminal i, Lij = Li*j +1, Nij
=Ni+j +1, Kij=Ki, it is not necessary that j+1.

Here, the transmission capacity of the multiplex line 8 is M [bits/second], and Kij, Lij, and N% Nij are each Li
j/Nij =Kij/N and Kij/N<
When it is a positive integer satisfying 1, bi = M f Kij / (N - L
ij)) [bits/sec] and Nij -5i <M is 11i.

According to the present invention, by using the multiplexing method as described above, it is possible to set the transmission rate on the multiplex transmission path for each burst.

FIG. 3 is a diagram showing an example of application of the present invention to a star local area network.

The present invention is particularly useful as a multiplex communication system between LAN dateway nodes 19 and nodes 18 between such star-shaped local area networks (LAN).

In this example, the 7-board 18 accommodates all or some of the low-speed terminals 15, medium-speed terminals 16, and high-speed terminals 17, and the terminals communicate with each other between different LANs. If communication is to be carried out, the network configuration is such that communication is carried out via the dateway node 19.

In this example, the dateway node 19 sets a time management frame, and when communicating between terminals belonging to different nodes, the dateway node 19 sets a fixed position on the time management 7 frames for each burst. At node 18, the burst signal from the terminal is
The configuration is such that the signal is converted into a multiplexed signal under the conditions stated in the claims.

〔Effect of the invention〕

As described above, the present invention has the advantage that the transmission rate on multiple lines can be set for each terminal, or in some cases, for each burst signal from the same terminal. Furthermore, when multiplexing burst signals from low-speed terminals, it is not necessarily necessary to do so at the transmission speed of the multiplex line. You can set the time before or after.

In addition, by minimizing bit rate conversion on multiple multiplex transmission paths from origination to incoming call, the number of times burst signals are accumulated for bit rate conversion can be minimized, which is necessary for signal accumulation. This has the advantage of reducing the amount of memory required and minimizing delays associated with speed conversion.

Furthermore, even when processing is performed on multiplexed signals as described above, processing of burst signals from low-speed terminals is not always necessary.
Since it is not necessary to perform the processing at the maximum speed on multiple lines, there is an advantage that processing costs can be reduced.

[Brief explanation of the drawing]

Figure f: tS1 is a diagram explaining the multiplexing method in the conventional dinotal data transmission system using packet switching, Figure 2 is a diagram showing an embodiment of the multiple speed multiplex communication system according to the present invention, and Figure f: IS3 is a diagram explaining the multiplexing method in the conventional data transmission system using packet switching. 1 is a diagram illustrating an example of application of the present invention to a local area network; FIG.

Claims (1)

[Claims] Let the multiple line transmission capacity be M [bits/second], Kij, L
ij, N, and Nij are respectively Lij/Nij=Kij/
When b is a positive integer satisfying N and Kij/N<1
Bit sequence bi [bits/second] that satisfies the relationship: i=M{Kij/(N・Lij)} [bits/second] and Nij・bi<M (i=1, 2, 3...) In a communication system that multiplexes burst signals on different lines onto multiple lines, a node sets a time management frame T (seconds) on the multiple lines such that M T is an integer to determine the frame interval. transmits a frame synchronization signal, while
Transmission rate bi [bits/second] multiplexed on multiple lines
No. from terminal i. The burst signal (variable length packet signal) is synchronized with the above synchronization signal and is transmitted in Lij×T [seconds].
unit, increase the bit rate by Nij times, and for each burst signal, time management frames T for every Lij on the multiplex line.
A multi-rate multiplex communication system characterized in that burst signals from a plurality of different speed terminals are time-division multiplexed transmitted by arranging the burst signals from a plurality of different speed terminals in fixed vacant time slot positions allocated by nodes within the system.