Abstract:
In order to measure the latency of a particular transport service from end to end, a method of measuring the latency of a transport connection between a first network node (NI ) and a second network node (N2) is provided, which makes use of a virtual concatenation function with a buffer (B) to compensate the differential delay between members in a received virtual concatenation group. In particular, the first network node (Nl ) creates a virtual concatenation group which has as members at least two multiplexing units (VC4_1, VC4_2). A first of the two (VC4_1 ) is used as a reference for the latency measurement. The second (VC4_2) is sent to the second network node (N2), where it is looped back to said first network node (Nl ). The first network node (Nl ), by using its buffer (B) available for re-aligning members of a virtual concatenation group, determines a latency difference between the first and second multiplexing units (VC4_1, VC4_2).
Abstract:
Instant discloser is a method to transmit multiple data-streams of varying capacity data using Virtual Concatenation (VCAT) over Synchronous Digital Hierarchy (SDH) network, comprising acts of determining number of data bytes to be requested for each Virtual Concatenation Group (VCG) in a row-time of the aggregated bandwidth and storing it in a VCG request configuration memory, reading the requested number of data bytes from each data-stream in order in to a Row Buffer for each row time of an SDH frame, reading data stored in the Row Buffer from memory address determined by one or more connection memory wherein the connection memory is programmed to carry out sequencing of bytes of the Row Buffer based on the VCAT numbering, and inserting path overhead (POH) and pointer information in to the read data streams in previous step to transmit multiple data-streams of varying capacity data using VCAT over SDH network.
Abstract:
A system and method are provided for performing Local Centre Authorization Service (LCAS) in a network system, the system having a data aligner configured to align bytes of input data according to groups of members. The system also including an LCAS control manager configured to generate de- sequencing control commands in response to data input from the data aligner. The system further including a de-sequencer configured to de-sequence the input data input from the data aligner according to de- sequencing control commands received from the LCAS control manager.
Abstract:
Methods and apparatus for enabling a line card to support multiple ports, multiple rates, and multiple protocols within an optical network system are disclosed. According to one aspect of the present invention, a line card that is suitable for incorporation into one of a multi-slot broadband digital cross-connect system or a multiservice provisioning platform includes a first port and a plurality of devices. The first port is arranged to be provisioned to accept an input signal which may be one of a signal of a first protocol and a signal of a second protocol. The plurality of devices being arranged to process the input signal to create an output signal which has a SONET payload. In one embodiment, the signal of the first protocol is an OC-n signal and the signal of the second protocol is a Gigabit Ethernet signal.
Abstract:
The invention discloses a method for carrying out service transmitting in a synchronous digital hierarchy (SDH) network. First, it determines the number of the demanded virtual containers (VC) according to the current service to be transmitted. Secondly, the VCs are mapped a virtual concatenation VC frame by adopting virtual concatenation mapping method, and the VC frame is transmitted to the receiver unit by the same route. The receiver unit unmaps the received VC frame by the adjacent concatenation unmapping method. The method can avoid the question about bandwidth wasting in the SDH networks transmitting service, and the higher demand to each net ware in the SDH transmitting network, and the long time delay under the virtual concatenation. And the method also makes the SDH network has the strongpoint of the adjacent concatenation and the virtual concatenation in the transmitting service.
Abstract:
A frame configured to be transmitted on a network and store data packets in a plurality of channels. One or more of the plurality of channels may be configured to store one or more fragments of the data packets (packet fragment 1, 2). Each separated and linked by an offset pointer (232). Each can also be any type, any length, and located anywhere in the frame including error portion (230) and labels to control routing of the payload (234).
Abstract:
The invention concerns a method and a system for transmitting Ethernet frames in a SDH network. The adaptation method consists in substituting, to one Ethernet frame transporting IP datagrams or the like, delivered by a local transmitting Ethernet network, a frame consisting of NRZ-type binary data, wherein to the preamble field is substituted a "particular word" field, the remainder of the frame being unchanged, said "particular word" being designed to be identified. The restitution method, after an adaptation in accordance with the adaptation method, consists, after identification of the "particular word" field of the NRZ-type binary data frame, is to restore an Ethernet frame transporting IP datagrams and deliver it to a local Ethernet receiver.
Abstract:
The invention relates to a method and to a device for converting virtually concatenated data streams into contiguously concatenated data streams. The data are transmitted in containers and N containers are combined in one multiframe. The virtually concatenated data streams consist of X partial streams/channels. Every container that is allocated to the same location in the multiframe is identified by evaluating a multiframe indicator of the container. The time-shift of said identified containers of the partial data streams with respect to one another is measured. If such a time-shift is detected, only the leading containers are delayed in such a manner that a time-wise alignment of all containers is achieved. Every channel (KA1, KA2,...) is correlated with a pointer interpreter (PI1, PI2), followed by an flexible memory (ES1, ES2) and a pointer generator (PG1, PG2). The pointer generators are inter-synchronized and every pointer generator is equipped to control the read-out of the flexible memory that pertains to its channel. A channel that is selected as the master channel (KA1) is provided with an overhead inserter (OI1).