JP3931750B2 - ATM communication apparatus and ATM cell transfer method used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ATM communication apparatus and an ATM cell transfer method used therefor, and more particularly to an ATM cell processing method in an ATM (Asynchronous Transfer Mode) communication apparatus.
[0002]
[Prior art]
Conventionally, in an ATM communication apparatus, as shown in FIG. 3, an IP (Internet Protocol) packet is accommodated in a SONET / SDH (Synchronous Optical Network / Synchronous Digital) via PPP (P0 int-to-Point Protocol). An Ethernet (R) frame is accommodated in SONET / SDH via GFP (Generic Framing Procedure).
[0003]
On the other hand, the ATM layer is located immediately above the SONET / SDH layer. This is because an ATM cell is an ITU-T (International Telecommunication Union-Telecommunication standard) recommendation I.I. It is shown that it is directly accommodated in SONET / SDH according to 432.
[0004]
[Problems to be solved by the invention]
By the way, as described above, the fact that ATM cells are directly accommodated in SONET / SDH means that ATM services cannot be accommodated simultaneously with other services such as IP service and Ethernet (R) service. . That is, since ATM cells are directly accommodated in the SONET / SDH payload, there is no room for accommodating other services.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide an ATM communication apparatus capable of simultaneously accommodating other services such as an IP service and an Ethernet (R) service and an ATM service in a predetermined frame, and an ATM cell transfer used therefor. It is to provide a method.
[0006]
[Means for Solving the Problems]
An ATM communication apparatus according to the present invention includes a first accommodation means for accommodating a signal of a first port for accommodating an IP (Internet Protocol) service in a GFP (Generic Framing Procedure) frame, and a LAN (Local Area Network) service accommodation. Second accommodation means for accommodating the second port signal for the first GFP frame in the GFP frame, and a third accommodation unit accommodating the third port signal for accommodating the ATM (Asynchronous Transfer Mode) service in the GFP frame. And storing IP packets, LAN frames, and ATM cells accommodated in the GFP frame, respectively, by SONET / SDH (Synchronous Optical NETwork / Synchronous Dig). It is housed in an (ital Hierarchy) frame.
[0007]
Another ATM communication apparatus according to the present invention includes a first accommodating means for accommodating a signal of a first port for accommodating an IP (Internet Protocol) service in a GFP (Generic Framing Procedure) frame, and a LAN (Local Area Network). Second accommodation means for accommodating the signal of the second port for accommodating the service in the GFP frame, and second signal for accommodating the signal of the third port for accommodating the ATM (Asynchronous Transfer Mode) service in the GFP frame. 3 accommodating means, each accommodating an IP packet, a LAN frame and an ATM cell accommodated in the GFP frame in an OTN (Optical Transport Network) frame.
[0008]
The ATM cell transfer method according to the present invention includes an IP (Internet Protocol) packet, a LAN (Local Area Network) frame, and an ATM (Asynchronous Transfer Mode) cell through a GFP (Generic Framing Procedure) frame through a SONET / SON Sch / SD Optical NETwork / Synchronous Digital Hierarchy) frame.
[0009]
According to another ATM cell transfer method of the present invention, an IP (Internet Protocol) packet, a LAN (Local Area Network) frame, and an ATM (Asynchronous Transfer Mode) cell are transmitted via an OT (OtNal Framing Procedure) frame through an OT (OtNal Frame Procedure). (Transport Network) frame.
[0010]
In other words, the ATM communication apparatus of the present invention is a network that transfers an ATM (Asynchronous Transfer Mode) cell, and an IP (Internet Protocol) packet or a LAN (Local Area Network) [for example, Ethernet (R)] to the ATM cell. The same processing as the frame is performed.
[0011]
More specifically, in the ATM communication apparatus of the present invention, an IP packet, an Ethernet (R) frame, and an ATM cell are passed through GFP (Generic Framing Procedure), SONET / SDH (Synchronous Optical Network / Synchronous Digital Hierarchy). ).
[0012]
Thus, in the ATM communication apparatus of the present invention, ATM cells are accommodated in SONET / SDH in the same manner as IP packets and Ethernet (R) frames, so that IP services, Ethernet (R) services, and ATM services will be used in the future. Even if the ratio of the network fluctuates, the network itself can be used as it is without being changed.
[0013]
Therefore, it is possible to remove the above-described restrictions in the conventional ATM communication apparatus and simultaneously accommodate other services such as the IP service and the Ethernet (R) service and the ATM service in the SOENT / SDH.
[0014]
Further, in the present invention, the ATM service can be mixedly accommodated with the IP service and the Ethernet (R) service in one SONET / SDH path, and the IP service, the Ethernet (R) service, and the ATM service can be accommodated. Even if the percentage of accommodation varies, it is not necessary to change the ATM communication device, and the service can be continued without replacing the device.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an ATM communication apparatus according to an embodiment of the present invention. In FIG. 1, the ATM communication apparatus 1 includes GFP (Generic Framing Procedure) accommodation means 11 to 13 and SONET / SDH (Synchronous Optical NETwork / Synchronous Digital Hierarchy) accommodation means 14.
[0016]
The GFP accommodation unit 11 is connected to the port 101 and accommodates the signal of the port 101 in the GFP frame. The port 101 is a port for accommodating an IP (Internet Protocol) service.
[0017]
The GFP accommodating means 12 is connected to the port 102 and accommodates the signal of the port 102 in the GFP frame. The port 102 is a port for accommodating a LAN (Local Area Network) [for example, Ethernet (R), etc., but will be described below using Ethernet (R) as an example] service.
[0018]
The GFP accommodation unit 13 is connected to the port 103 and accommodates the signal of the port 103 in the GFP frame. The port 103 is a port for accommodating an ATM (Asynchronous Transfer Mode) service.
[0019]
The SONET / SDH accommodating means 14 accommodates the IP packet, Ethernet (R) frame, and ATM cell accommodated in the GFP frame by the GFP accommodating means 11 to 13 in the SONET / SDH frame and outputs them to the port 104. Note that the configurations of the GFP accommodation means 11 to 13 and the SONET / SDH accommodation means 14 are techniques well known by those skilled in the art, and the configuration is not directly related to the present invention, so that the detailed configuration will be described. Is omitted.
[0020]
In this way, in this embodiment, ATM cells are accommodated in SONET / SDH frames in the same manner as IP packets and Ethernet (R) frames, so in the future, IP services, Ethernet (R) services, and ATM services will be used. Even if the ratio varies, the network itself can be used without change.
[0021]
Note that one or a plurality of ATM cells can be accommodated in the GFP frame. In addition, once these IP packets, Ethernet (R) frames, and ATM cells are accommodated in the GFP frame, only the GFP frame level multiplexing is performed in the transmission, and what is included in the contents should be considered. There is no need to handle only GFP frames.
[0022]
FIG. 2 is a diagram showing the structure of a SONET / SDH frame according to an embodiment of the present invention. In FIG. 2, an IP packet, an Ethernet (R) frame, and an ATM cell are each accommodated in a GFP frame and then accommodated in a SONET / SDH frame.
[0023]
An ATM communication apparatus 1 and a SONET / SDH frame according to an embodiment of the present invention will be described with reference to FIGS.
[0024]
The port 101 is used for accommodating an IP service. For example, an IP packet is input by a PPP (Point to Point Protocol) over SONET / SDH defined by RFC (Request For Comments) 1619 of the Internet Engineering Task Force (IETF). Is done.
[0025]
The port 102 is used to accommodate an Ethernet (R) service. For example, an Ethernet (R) frame is input by a widely used 10Base-T, 100Base-T, 1000Base-SX, or the like.
[0026]
Further, the port 103 is used for accommodating an ATM service, for example, ITU-T recommendation I.D. An ATM cell is input by an SDH frame as defined in 432.
[0027]
When these services are accommodated in SONET / SDH, they are usually accommodated by PPP over SONET / SDH in the case of IP packets, and usually by ITU-T Recommendation I.432 in the case of ATM cells. However, there is no compatibility between PPP over SONET / SDH and I.432, and these cannot be mixedly accommodated in one SDH / SONET path. Therefore, conventionally, each service is accommodated separately in a SONET / SDH frame.
[0028]
On the other hand, in order to accommodate the Ethernet (R) frame in SONET / SDH, GFP defined in ITU-T recommendation G.7041 can be used. This GFP can be applied not only for accommodating Ethernet (R) frames in SONET / SDH frames but also for accommodating IP packets.
[0029]
In general, GFP is applicable to accommodation of any signal as long as it has a byte structure. Therefore, GFP is used not only for accommodating Ethernet (R) frames and IP packets in SONET / SDH but also for accommodating ATM cells in SONET / SDH. In this way, ATM services can be accommodated in SONET / SDH simultaneously with IP services and Ethernet (R) services, and can be accommodated together in the same SONET / SDH path. Become.
[0030]
In the description of this embodiment, an example of accommodation in SONET / SDH has been described. However, various services are mixed in other frames, for example, an OTN (Optical Transport Network) frame defined in ITU-T recommendation G.709. It can also be applied to housing.
[0031]
As described above, in the present embodiment, the ATM service is accommodated in the SONET / SDH frame via the GFP frame in the same manner as the IP service and the Ethernet (R) service. It can be accommodated simultaneously with the IP service and the Ethernet (R) service.
[0032]
In this embodiment, the ATM service can be mixedly accommodated with the IP service and the Ethernet (R) service in one SONET / SDH path.
[0033]
Furthermore, in this embodiment, even if the proportion of accommodation of IP service, Ethernet (R) service, and ATM service fluctuates, there is no need to change the ATM cell transfer device, and the service can be used without replacing the device. Can continue.
[0034]
【The invention's effect】
As described above, the ATM communication apparatus of the present invention accommodates IP packets, LAN frames, and ATM cells in SONET / SDH frames via GFP frames, thereby providing other services such as IP services and Ethernet (R) services. And the ATM service can be accommodated simultaneously in a predetermined frame.
[0035]
In addition, another ATM communication apparatus of the present invention accommodates IP packets, LAN frames, and ATM cells in OTN frames via GFP frames, thereby enabling other services such as IP services and Ethernet (R) services. There is an effect that the ATM service can be accommodated in a predetermined frame at the same time.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an ATM communication apparatus according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating a structure of a SONET / SDH frame according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating a configuration of a SONET / SDH frame according to a conventional example.
[Explanation of symbols]
1 ATM communication device 11-13 GFP accommodation means 14 SONET / SDH accommodation means 101-103 port

Claims (8)

First accommodation means for accommodating a signal of a first port for accommodating an IP (Internet Protocol) service in a GFP (Generic Framing Procedure) frame, and a second port for accommodating a LAN (Local Area Network) service Second accommodating means for accommodating a signal in the GFP frame, and third accommodating means for accommodating a signal of a third port for accommodating ATM (Asynchronous Transfer Mode) service in the GFP frame, IP packets, LAN frames, and ATM cells accommodated in GFP frames are converted into SONET / SDH (Synchronous Optical NETwork / Synchronous Digital Hierarch). ATM communication apparatus characterized by accommodating the y) frame. First accommodation means for accommodating a signal of a first port for accommodating an IP (Internet Protocol) service in a GFP (Generic Framing Procedure) frame, and a second port for accommodating a LAN (Local Area Network) service Second accommodating means for accommodating a signal in the GFP frame, and third accommodating means for accommodating a signal of a third port for accommodating ATM (Asynchronous Transfer Mode) service in the GFP frame, An ATM communication apparatus characterized in that an IP packet, a LAN frame, and an ATM cell accommodated in a GFP frame are accommodated in an OTN (Optical Transport Network) frame. 3. The ATM communication apparatus according to claim 1, wherein the GFP frame is defined by ITU-T recommendation G.7041. The ATM communication apparatus according to claim 2, wherein the OTN frame is defined by ITU-T recommendation G.709. IP (Internet Protocol), LAN (Local Area Network) frames, and ATM (Asynchronous Transfer Transfer Mode) cells via a GFP (Generic Framing Tunnel Protocol) SONET / SDH (Synchronous Protocol). An ATM cell transfer method characterized in that it is accommodated. An IP (Internet Protocol) frame, a LAN (Local Area Network) frame, and an ATM (Asynchronous Transfer Mode) cell via an GFP (Generic Framing Procedure) frame are accommodated in an OTN (Optical Traffic Transport frame). ATM cell transfer method. 7. The ATM cell transfer method according to claim 5, wherein the GFP frame is defined by ITU-T recommendation G.7041. The ATM cell transfer method according to claim 6, wherein the OTN frame is defined by ITU-T recommendation G.709.

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