Patent ID: 8514881
Filing Date: 2013-08-20
Classification: H04J,H04L

Abstract:
1. A digital transmission system for performing transmission and reception of a signal between a transmitter side network and a receiver side network, the transmitter side network comprising at least a client device and a transmission device, and for rate-adjusting a client signal transmitted from the client device to the transmission device as necessary and accommodating, or accommodating and multiplexing, to an accommodation rate, the transmission device comprises: wherein a bit string of the client signal is accommodated, or accommodated and multiplexed, directly in the payload portion, or is accommodated, or accommodated and multiplexed, in the payload portion after subjecting it to a reversible digital signal processing, wherein the frame structure comprises a GFP (Generic Framing Procedure) frame structure, wherein, the rate adjusting unit is configured, when detecting an alarm signal indicating abnormality of the client signal, to insert a specific bit pattern according to an abnormal condition indicated by the alarm signal into a header area of the GFP, and the abnormal condition is informed of the receiver side network that receives the client signal from the transmission device; and wherein, in the rate adjusting unit, a predetermined area is provided in a header portion of the frame structure; a predetermined bit pattern is accommodated in the area; and a bit error rate is estimated by counting a bit error of the area in the receiver side network, to perform performance monitoring of the rate-adjusted client signal in the rate adjusting unit.