Apparatus and method for gfp frame transfer
A technology for transmitting equipment and programs, which is applied in the field of GFP frame transmission equipment, and can solve problems such as inability to monitor end-to-end paths and performance monitoring.
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no. 1 example
[0052] FIG. 9 is a block diagram showing an example of a network (referred to as "GFP network") constituted by GFP frame transfer devices according to the first embodiment of the present invention. Next, we will describe this embodiment by taking a ring-connected GFP network formed as a SONET ring as an example. For this reason, it is assumed that what is to be transmitted in the GFP network has the following Figure 7 A GFP ring frame in the format of the payload header shown.
[0053] According to FIG. 9, the ring GFP network in this embodiment is composed of a group of GFP nodes 1 (N1, N2, . . . , N7) connected in a ring. Each GFP node 1 is connected to one or more user networks. In the following description, for the sake of simplicity, it is assumed that each GFP node 1 is only connected to a single user network. Each GFP node 1 has multiple ports, and each port has a corresponding port number. For example, assume that the port number on the west side port is assigned ...
no. 2 example
[0103] Next, a second embodiment of the present invention will be described.
[0104]This second embodiment uses the conventional FCS generation target area without change as the FCS generation target area while employing a different FCS recalculation method. It performs FCS generation (computation) at ingress GFP node 1 and FCS verification at intermediate GFP node 1 or egress GFP node 1 according to conventional standards. On the other hand, when the FCS is recalculated at the intermediate GFP node 1, this embodiment will calculate a new FCS by using the change difference between the payload header and the original FCS.
[0105] The second embodiment calculates the difference between the original load head (when GFP node 1 is an input) and the new load head (when GFP node 1 is an output), and divides this difference by a CRC32 calculation generating function G (x). The result of XOR operation between the remainder of the division result and the original FCS will get a new ...
no. 3 example
[0187] Next, we will describe a third embodiment of the present invention.
[0188] Such as Figure 20 As shown, in this embodiment, the conventional FCS output target area is used as the FCS output target area without any modification, and a new error notification bit is defined in the payload header. In the case of eg a GFP ring frame, this error notification bit can be defined in the idle field of the payload header.
[0189] Figure 21 Shown is a schematic diagram of using the FCS field and error notification bits to monitor end-to-end path performance in the third embodiment of the present invention. Figure 21 shown as in Figure 15 In the situation shown, a schematic diagram of transmitting GFP frames in a part (N2→N5) of the ring GFP network as shown in FIG. 9 .
[0190] Such as Figure 21 As shown, when an error occurs in the GFP link through the FCS check, the GFP frame interface section 13 of the GFP frame termination section 5 of the GFP node 1 where the error...
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