JPH0414341A - Lan equipment - Google Patents

Abstract

PURPOSE:To simplify the extension of number of terminal equipments and of its range by allowing an HUB being a network expansion device to detect a frequency of a reception packet and setting a bus in response to the transfer speed of each medium. CONSTITUTION:When a signal is inputted to an input terminal IN1, a frequency detection circuit 1 is started to detect a frequency of an input signal to decide whether a 10M retiming amplifier circuit 3 and a 10M gate 5 are started or a 1M retiming amplifier circuit 4 and a 1M gate 6 are started and to activate the selected devices. Thus, an output of a port receiving a 10MHz frequency signal acts like a port for the 10MHz frequency signal. Then a signal inputted from the input terminal IN1 is also outputted to other output port (in this case, OUT2) as a function of an HUB 10. In this case, whether a 10MHz frequency signal is outputted or a 1MHz frequency signal is outputted is decided depending on an input terminal IN2 latches a state which of the frequency ports.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a LAN device that allows LANs with different transfer speeds to coexist in the same location, making it possible to increase the number of terminal devices and extend the connection distance. be.

[Prior Art] Conventionally, in a CSMA/CD type LAN, as shown in Fig. 4, a HUB for network expansion has been used.
A data terminal (DTE) is connected through a media cable using I-HUB5.

The HUB is provided with a collision detection circuit, a timing circuit, etc., and transmission data from each DTE is amplified and retimed within the HUB.

Note that the system 40 within the broken line in FIG. 4 is the initial LAN configuration of the expansion chain, and is hierarchically configured with HUB3. HUB
By adding I, we are trying to extend the distance and increase the number of DTEs.

By the way, conventional network expansion devices (HUBs, adapters, etc.) may perform network media conversion, but they cannot coexist with media having different transfer speeds. Here, media conversion means, for example, from twisted pair cable to AU
This includes the function of converting to 1 cable. In addition, as a LAN device using HUI3, for example, the IA of the patent application No. 1-61326 and the drawings proposed by the present inventor
NI! 1lJ11 circuit".

[Problems to be Solved by the Invention] FIG. 2 is a diagram showing an example of connection of LAN devices using a HUB.

The basic components of a LAN device include cables for packet transmission, an HlJB for concentrating these cables, and a DTE (terminal) for transmitting and receiving packets.

Now, as shown in Figure 2, DETI~DTE6 and Hl
There are two types of transfer speeds for the media connected to JB, and packets are transferred between DTEI and DTE3 at a speed of IMbps, for example, as shown by a solid line), and between DTE4 and DTE3.
For example, packets are transferred at a speed of 10 Mbps between HUB 6 and 6 (indicated by a dotted line), and the case where these are co-existed in the same HUB is shown.

However, although the conventional HtJB has the network media conversion function as described above, it has been impossible for media with different transfer speeds to coexist in the same HIJB. Therefore, also in the case of Fig. 2, D
DTE2. from TEI via HUB. Although it was possible to transfer to DTE3, it was not possible to transfer to DTE4 to DTE6. Similarly, from DTE4 to HU
DTE5. Although it is possible to transfer to DTE6, it is not possible to transfer to DTEI to DTE3. Therefore, when a small number of DTEs join a network, or when you want to further extend the network distance, it is necessary to configure networks with different transfer speeds, so it is necessary to provide an HTJB for each different transfer speed. Ta. As a result, it is economically disadvantageous to add DTE or extend the distance, thereby impairing scalability.

The purpose of the present invention is to solve such conventional problems, and to make it possible to economically increase the number of network terminals and extend the distance by allowing media with different transfer speeds to coexist in the HUEI, which is a network expansion device. The purpose of the present invention is to provide such a LAN device.

[Means for Solving the Problems] In order to achieve the above object, the LAN device of the present invention includes a frequency detection circuit for detecting the frequency of a received packet, and a frequency detection circuit for detecting the frequency of a received packet. A basic processing circuit that performs retiming and signal amplification at a transfer speed according to the frequency, and a gate circuit that passes the output of the basic processing circuit for each frequency are provided to create the same route for media with different transfer speeds. The feature is that they coexist within the HUB.

[Function] In the present invention, by having the HUB, which is a network expansion device, detect the frequency of received packets and setting a path corresponding to the transfer speed of each medium, it is possible to use media of different speeds. Let them coexist. )I
When a signal is input to the UB, it detects that frequency, responds to as many coexisting frequencies, or activates one of the timing circuits, and continues that circuit until a signal of the next frequency is input. make it work. When a signal of the next frequency is input, it switches the input to correspond to that frequency or activates the timing circuit.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of a HUB showing an embodiment of the present invention.

10 is a HUB, 1 and 2 are frequency detection circuits for detecting the frequency of the input signal, 3 and 4 are timing amplifier circuits with different frequencies, 5.7 is a gate for one frequency, and 6.8 is for the other frequency. It is a frequency gate.

In this way, the HUBIO of the present invention includes the retiming amplifier circuit 3゜4, which is the conventional basic processing section, the newly provided input signal frequency detection circuits 1 and 2, and the output according to each signal. It is composed of gates 5 to 8. Here, in order to make it easier to understand, we will explain the basic processing units (3, 4) of the HUB.
) is shown in parallel processing, but it is also possible to switch only the processing speed to simplify the circuit.

In FIG. 1, media with two types of transfer speeds, a 10 Mbps frequency and an IMbps frequency, coexist within the same IUB, but it goes without saying that three or more types can coexist.

Although INI and ○UTI are shown separately on the left and right, they are boats on the same HUBIO. Now, when a signal is input to the input terminal IN1, the frequency detection circuit 1 is activated, detects the frequency of the input signal, and activates the 10M retiming amplifier circuit 3 and the 10M gate 5, or activates the 1M retiming amplifier circuit 3 and the 10M gate 5. - Decide whether to activate the amplifier circuit 4 or the 1M gate 6, and operate one of them. This state is maintained and does not switch until another frequency signal is input next. Therefore, in a boat to which a 10M frequency signal is input, the output will also function as 10M.

Next, the signal input from INI can also be output to another output port (here, UT2) as a function of HUBIO. At this time, depending on which frequency port the input terminal IN2 is holding,
It is determined whether the 0M frequency or the IM frequency is output. In addition, input terminals INI, N2
If a packet of the same frequency for 10M or IM is input at the same time, it is treated as a collision.

FIG. 3 is a configuration diagram of the frequency detection circuit in FIG. 1.

In FIG. 3, 31 to 33 are sense amplifiers (gates) that amplify the input signal, and 34.35 are sense amplifiers 31 to 33.
This is a mono multivibrator that triggers when the output of 33 exceeds a certain level.

Sense amplifier 31 is for 10M, sense amplifier 33 is for IM
The sense amplifier 32 also detects the waveform level and triggers the mono multivibrator 34 when it exceeds a certain level. In addition, the sense amplifier 32
When the input signal is IMHz, the signal simply passes through the IOM mono multivibrator 34,
Re-input to the IM multivibrator 35. The mono multivibrator 34 has a constant determined so that it is retriggered when a signal of 5 to 10 MHz is input.
Its output signal ENERGY ] O is the sense amplifier 3
It is gate number 1. Further, the other mono multivibrator 35 has a constant determined so that it is retriggered when a signal of 0.5 to IMHz is input, and the output signal ENERGYI serves as the gate of the sense amplifier 33.

By detecting the frequency with such a circuit, 10M
It is possible to separate the input signals of the IM and the IM.

In this embodiment, since media with different transfer speeds can coexist within the same HUB, an environment can be created in which LANs with different transfer speeds coexist. As a result, when increasing the number of network DTEs or extending the connection distance by allowing media with different transfer speeds to coexist in the network expansion device HUB, a new HUB is installed for each different transfer speed. These can be easily achieved as there is no need to do so.

[Effects of the Invention] As explained above, according to the present invention, the HUB, which is a network expansion device, detects the frequency of the receiving bucket and sets the bus according to the transfer speed of each medium. Since media with higher transfer speeds can coexist, the number of terminals and distance can be easily increased.

[Brief explanation of drawings]

Figure 1 shows an H for network expansion showing an embodiment of the present invention.
UB block configuration diagram, Figure 2 is a connection diagram of a LAN with HLIB that coexists media with different transfer speeds, Figure 3 is a configuration diagram of the frequency detection circuit in Figure 1, and Figure 4 is a diagram of the conventional HLIB. It is a block diagram of the equipped LAN. 1.2: Frequency detection circuit, 3,4: For 10M. IM timing amplifier circuit, 5, 7: 10M gate, 6, 8: 1M gate, 31 to 33: sense amplifier, 34, 35: mono multivibrator, 40 System configuration before expansion. Figure LAN (Local Eliane, Towak) connection example

Claims (1)

[Claims] (1) The network expansion HUB includes a frequency detection circuit that detects the frequency of received packets, a basic processing circuit that performs retiming and signal amplification at a transfer rate according to the frequency detected by the frequency detection circuit, and a frequency detection circuit that detects the frequency of received packets. A LAN device characterized in that it is provided with a gate circuit that allows the output of a basic processing circuit to pass for each frequency, and that routes for media having different transfer speeds coexist within the same HUB.