JPS59152751A - Automatic connecting system of plural logical channels - Google Patents

Abstract

PURPOSE:To attain the transfer in the communication to a fixed opposite party by transferring a packet arrived from one logical communication channel in plural logical communication channels set to a terminal to another logical communication channel by the automatic connection indication from the terminal. CONSTITUTION:When a packet terminal PT2 stops communication, the PT2 transmits a registration request packet FQ (l21, l22) to a packet exchange PS2 as the automatic connection command to the opposite fixed class communication channels PVC12, PVC23 in order to transfer a data packet DT (l21) to a packet terminal PT3. A logical channel number converting circuit TLR analyzes the FQ (l21, l22) received via a packet receiving circuit REC in the PS2, a connection display C of a logical channel memory LCM corresponding to the logical channel number l21 to store a connected logical channel number l22, and the connecting display C of the corresponding LCM to the l22 similarly is set to the connecting state to store the l21. When this processing is finished, the TLR returns the FF (l21, l22) to the PT2 via a packet transmitting circuit SND.

Description

[Detailed description of the invention] (21) Technical part of the invention! I'l' The present invention relates to a Packet 7+- switching network, and more particularly to a multiple logical channel automatic connection system that enables automatic transfer of buckets arriving via a logical 11n channel of a fixed-party class.

(bl Background of the Technology In a bucket switching network, a physical connection path is not set up between the originating and arriving θfii terminals that perform bucket communication, but instead a logical communication path (hereinafter referred to as a trace transfer) is set up. ,
Both terminals transmit and receive buckets via the communication path and multiply jIr by 1 as required. The communication path is based on the partner selection class (V
virtual Ca1l) and a fixed peer class (Permanent Ca1l) that is always set for the terminal registered in advance.
emtVirtualC1rcuit). Note that the terminal specifies the communication path to be used by the logical channel number registered in advance in the required packet switch.

(C1 Prior Art and Problems) Fig. 1 is a diagram showing an example of a conventional bucket communication system using a fixed-party class communication path. 1) Constructed by S3. Ima Pakeno I ~ Exchange Il
l, I) Bucket η accommodated in S l ) 1 logical channel Ill of P T I and bucket switch 1
) There is a fixed class communication path PV CI between Bageno 1 accommodated in 32 and the logical channel + 21 of terminal P T2.
2 is set, and a peer fixed class communication path PVC23 is set between the logical channel 122 of the TGL terminal PT2 and the logical channel 131 of the terminal PT3 accommodated in the PC switch PS3. It is assumed that In such a state, the bucket exchanger 1
) S] G, (1, packet terminal P T 2 ) rli:l
B link number b21 including terminal number and logical channel number + i3' I21 is stored, and packet switch P
Phase in S2: '□J÷Fixed class signal path] Cash flow V Cl
A logical channel memory (not shown) provided corresponding to node 2 stores a B link number b11 including the terminal number of the terminal PTI and the logical channel number 111, and also stores the destination fixed class communication path 1). A logical channel memory (not shown) provided corresponding to the VC 23 stores the bucket terminal P'"B link number including the terminal number of 3 and the logical channel number +31" 13b31, and further stores the packet exchange 111. (The terminal number of the bucket terminal PT2 and the B link number b22 including the logical channel number 122 are stored in a logical channel memory (not shown) provided in the PS3 corresponding to the partner fixed class communication path pvc23. In this state, the bucket terminal PT1 sends a data packet including the logical channel number 111.
-1) T" (I I 1), the packet switch PS1 refers to the logical channel memory and determines the network including the B link numbers bll and b21 in the received data bag node +-1) T (I I I). An internal header is added to create an internal data packet D'l'' (bll b21), and the packet data packet D'l'' (bll b21) selected by 13 link number b21 is sent to
The switch PSZ sends it to the curved route. The packet exchange 131P, s2 that received the intra-network data packet DT" (bll/b21) refers to the logical channel memory and then
Data bucket containing logical channel number 121 l)T
' (+21) and sends it to the bucket terminal P'■'2 selected by the B link number b21. According to i-, is the bucket terminal P T1 connected to fixed class communication 1?
Packet communication with bucket terminal PT2 becomes possible via δPVCI2.

i bucket terminal P'F2 has logical channel number 122
When transmitting the data packet /1-r)T (I22), the packet switch PS2 refers to the logical channel memory and determines whether the received data packet DT(+22) contains the 13 link numbers b22 and b31. Intranet data bucket l-I)'r'' (b2
2-b31) is created and sent to the Pa-queso 1-exchange PSa direction selected by the B link number b31. The packet-switched RPs3 that received the intra-network data bucket) DT" (b22, b31) refers to the logical channel memory and selects the data packet 1 containing the logical channel number 131.
- DT (131) is created and sent to the bucket terminal PT3 selected by the B link number b31. As a result of the above, Paqueso 1 to terminal P T 2 is the other party's fixed class communication path pv
Packet communication with bucket terminal P'r3 becomes possible via C23.

As is clear from Hendo's explanation (in a conventional bucket communication system using a fixed destination class communication path, the bucket terminal PTl transmits a packet to the bucket terminal PT2 via the fixed destination class communication path PVC12, and , 1. Terminal P T 2 is the fixed class communication path PVC 2 of the other party.
The packet can be transmitted to the bucket terminal PT3 via the packet terminal PT3. However, if bucket terminal PT2 discontinues communication for some reason, in order for bucket terminal P'r3 to receive packets sent by bucket terminal PTl instead of bucket terminal PT2, bucket terminal 1)
A new peer fixed class communication path PVC31 had to be set up between the TI and the bucket terminal PT3. In the case of a destination selection class, there is a known service that forwards packets arriving at a bucket terminal that has performed a predetermined forwarding registration operation to a specified bucket terminal, but in the case of a fixed destination class, such a service is not available. It was impossible.

fdl OBJECTS OF THE INVENTION An object of the present invention is to eliminate the drawbacks of conventional packet communication systems as described above, and to realize a means that allows packets to be transferred even through fixed-party class communication paths.

(ρ) Structure of the Invention This purpose is to establish a logical communication path between a plurality of terminals, and to transmit buckets between the terminal zHHs via the logical communication path. In the network, in response to an automatic connection instruction from the terminal, a bucket arriving from one of the multiple logical communication paths (i-way) set to the terminal is connected to the other 0? logical communication path. This is achieved by transferring the

(fl　Embodiments of the invention An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram illustrating a multiple logical channel automatic connection system according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating an example of the Paketso 1 transfer process shown in FIG. 2.

Note that the same reference numerals indicate the same objects throughout the figures.

FIG. 2 targets the packet switch PS2 shown in FIG. 1, and includes the packet receiving circuit RFC, which receives various buckets arriving from the packet switch PS1 or the packet terminal PT2 (FIG. 1), the bucket terminal PT2, or the packet switch PS3. ．． Send a packet to (Figure 1) t1
The storage unit MM corresponds to the packet transmission circuit SND and the logical channels 121 and 122 of the packet terminal PT2.
A logical channel memory LCM provided in the internal memory LCM and the logical channel memo U1. ,, In addition to the link table LKM used to search for CMs, a logical channel number conversion circuit TLR for controlling bucket transfer is provided. As in FIG. 1, the packet exchange N,l!
The packet terminal PT2 accommodated in PS2 and given the terminal number r2 has a connection with the packet terminal PT1 accommodated in the bucket switch PS1 (not shown) specified by the logical channel number 121. It is assumed that a fixed class communication path PVC12 is set up, and a peer fixed class communication path PVC23 specified by a logical channel number I22 is set up with a packet terminal PT3 accommodated in a packet switch Ps3 (not shown). As a result, the B link number bll is stored in the logical channel memory LCM corresponding to logical channel number 121, and the logical channel memory LCM corresponding to logical channel number 122 is stored.
The I3 link number b31 is stored in . Furthermore, each logical channel memory LcM stores a connection indication C in addition to the B link number bll or b31. The connection display C
is set to a non-connected state if no automatic connection indication is performed from the packet terminal P T 2. In Figures 2 and 3, the bucket machine 1 to the terminal PT
The data packet DT (111) sent by I is transferred to the network data bucket DT" (b
ll-bll), and the destination fixed class communication path P-
, VC12 and arrives at the packet switch I) S2, the packet receiving circuit REC of the packet switch PS2 receives the intra-network data packet
bll) to the logical channel number conversion circuit TLR. The logical channel number conversion circuit TLR analyzes the received network data bucket) DT' (bll/bll) and converts it to the logical channel number 121 based on the B link number b2].
Search the logical channel memory LCM corresponding to . As a result, the logical channel number conversion circuit TLR identifies that the connection indication C is set to the non-connected state, creates a data packet DT (121) from the intra-network data packet DT' (bll · bll), and It is sent to the packet terminal PT2 via the transmission circuit SND. Based on the above, the first
As in the figure, the data packet DT (111) sent by the packet terminal P'TI is transmitted as the data packet DT (+21) to the packet terminal 1) T2 via the destination fixed class communication path PVC12. Now packet terminal PT 2 has stopped communication and packet terminal PTI
In order to transfer the data packet D'T(+21) sent from the packet terminal PT3 to the packet terminal PT3, the packet terminal PT2 sends a registration request bucket FQ(121.1
22) is sent to the packet switch PS2. In the packet switch PS2, a logical channel number conversion circuit T''
L R analyzes the received (n registration request bucket) FQ (121, 122) via the bucket receiving circuit REC, and stores the logical channel memory L corresponding to logical channel number 121.
The CM's residence display (, is set to the connected state and the connection destination logical channel number 122 is stored, and the logical channel number 12
The connection indication C of the logical channel memory LCM corresponding to 2 is set to the connected state, and the connected logical channel number +21 is stored. Connecting FFA to logical channel memory LCMt
When the setting of the 1-indicator C and the storage of the connection destination logical channel are completed, the logical channel number conversion circuit TLR sends a registration confirmation to the packet terminal PT2 regarding the BA/5/SOTO transmitting circuit SND to indicate the completion of automatic connection. Packet FF (121・1
22). In such a condolence, the packet terminal P
The data packet 1-DT (+11) sent by TI is sent to the network data packet 1-1) i by the packet switch Psi.
(1)11・b21), and when it arrives at the packet switch PS2 via the destination fixed class communication path PVC12, the packet switch 1-exchange IJ31.PS2 smell-ζ is the logical channel number conversion circuit TLR analyzes the local data packet 1) "T" (b I l - b21) received via packet reception amount I+'8RE C, and determines the logical channel corresponding to logical channel +21 based on the B link number b 2 t. Search the memory LCM so that the logical channel number converter Ill'; T
'L R has connection display C set to connected state,
It is identified that the connection destination logical channel number 122 is stored, and the logical channel number! 22 and extracts the B link number b31. The logical channel number conversion circuit ``I'L r?'' converts the packet switch 1)S based on the extracted B link number b31.
Select the strategy for 3 and enter the network data page 1-DT”
The B-link number b21 included in (bl1-b2-' 1) is converted to the B-link number b31c to create an intra-network data packet I) 1-Switchboard PS3
Send in the desired direction. The premises data Pagano 1-DT'
Pake who received (bl 1-b31).

1 to PS3 refer to the logical channel memory in the same way as shown in FIG. Data packet I]1'(11
1> is transferred to the registered packet terminal P T 3.

As is clear from the explanation below, according to this embodiment, the packet requesting transfer) I'#I! When the terminal P'V2 sends a predetermined registration request packet 1-FQ (+21・122), the data packet transmitted from the packet terminal PTI to the packet terminal PT 2 via the partner fixed class communication path PVC12. ID T is packet terminal PT
Transferred to 3.

Note that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the packet 1 to be transferred is not limited to the data packet DT, and may be, for example, the receivable packet R.
The effects of the present invention do not change for other packets such as RNR (R or unreceivable bucket). Furthermore, the automatically connected communication path is not limited to the partner fixed class communication path PV (J), and also in the case of the partner selection class communication path, according to the present invention.
One fruit remains unchanged. Furthermore, the communication path that is automatically connected is not limited to the one established between different packet terminals 1'TI and PT3, but the same communication path, bucket 1, and terminal (
For example, it is also possible to automatically connect two sets of communication paths set up between the packet terminal (PTI) and perform a return test from the packet terminal (PTI), but the effects of the present invention do not change even in such a case. . Furthermore, it goes without saying that the configuration of the packet-switched fiPs2 is not limited to what is illustrated.

(g) Effects of the Invention -1 According to the present invention, in the packet switching network, it becomes possible to transfer the packet switching network via the destination fixed class communication path and the destination selection class communication path. Usage forms will be diversified.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a conventional bucket communication method using a fixed destination class communication path, FIG. 2 is a diagram showing an automatic connection method for multiple logical channels according to an embodiment of the present invention, and FIG. FIG. 3 is a diagram illustrating an example of a packet transfer process. In the figure, PTI, PT2, and PT3 are packet terminals, Psi, PS2, and PS'3 are Pagano switchboards, MM is a memory unit, RP C is a Bakeno1 receiver circuit, and SN
D is a buffer-soto transmission circuit, TLR is a logical channel number conversion circuit, l, KM is a link table, LCM is a logical channel memory, r2 is a terminal number, +11.112.1
21, 22, and 131 are logical channels, bll,
b21, b22 and b31 are B link numbers, C is a connection display, DT is a data packet, and DT" is a tree data node (
FQ indicates a registration request packet, and FF indicates a registration confirmation packet. Ne (mouth 2 mouth 3 eyes I P51 PS
2 PTZ1

Claims (1)

[Claims] In a bucket exchanger that sets a logical communication path between a plurality of -Ijil unphased lj1 and transfers the logical j, +ff channel money and transmits the bucket to the terminal terminal, automatic communication from the terminal is performed. A plurality of logics characterized in that, in response to a connection instruction, a bucket arriving from one of a plurality of logical communication paths set in the terminal is transferred to the other logical communication path. Automatic channel connection method.