K. Sivalingam and P. Dowd, "A Lightweight Media Access Protocol for a WDMBased Distributed Shared Memory System.," Proceedings, IEEE INFOCOM '96, San Francisco, pp. 946-953, Mar. 1996.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....transmissions are studied for this architecture. For bit parallel transmission, multiple receiver processing units are required to handle the parallel bit streams. For bit serial, only one receiver unit is required. The access protocols use reservation mechanisms to satisfy transmission requests [8, 9]. Communication is single hop and data is retained in the optical domain from source to destination. We will use STAR BST and STAR BPW to denote bit serial and bit parallel star respectively. The multi hop Shufflenet architecture studied in this paper is based on BPW transmission as studied in ....

....first slot that does not have all C channels assigned. The sender also ensures that destination conflicts do not exist in a data slot. This is done by checking all the destinations that are currently allocated in the slot. Note that this protocol is derived from the LiteMAC protocol described in [9]. Fig. 4 shows the data phase allocation for STAR BST and STAR BPW for M = 8, C = 2 and K = 2. The data phase length with STAR BST is 4L units and one slot on channel 2 is wasted. The cycle length with STAR BPW is 3:5L units and no slots are wasted. It will be interesting to observe the ....

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K. M. Sivalingam and P. W. Dowd, "A Lightweight Media Access Protocol for WDM-Based Distributed Shared Memory System," in Proc. IEEE Conference on Computer Communications (INFOCOM) , vol. 2, (San Francisco, CA), pp. 946--953, Mar. 1996.

....channel for reception as in [3] and a node can transmit and receive on any free channel. The protocol is derived from the reservation based FatMAC protocol developed for the tunable transmitter and fixed receiver (TT FR) architecture [14] Note that the LiteMAC protocol was originally presented in [15] where preliminary results of the protocol and a comparison to FatMAC were presented. The rest of the paper is organized as follows. Section 2 describes the network architecture. Section 3 describes the protocols. Section 4 considers the performance of LiteMAC. Section 5 provides the prototype ....

....on the individual channels within the channel set (the channels allocated to that level) Fig. 4 shows that the cycle length is 4 slots. There is one unused slot and data phase utilization is seen to be 0:875. The impact of unused slots is higher for non uniform client server traffic as shown in [15]. The above allocation algorithm allows at most one request per node per data cycle. Other extensions that allow two or more requests per node per cycle have been studied in [1, 15] Increasing the number of requests results in improved utilization but also leads to increased complexity and ....

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SIVALINGAM, K. M., AND DOWD, P. W. A Lightweight Media Access Protocol for WDM-Based Distributed Shared Memory System. In Proc. IEEE INFOCOM (San Francisco, CA, Mar. 1996), vol. 2, pp. 946--953.

....concurrently accessed due to the combination of spatial and wavelength multiplexing. 3 PROTOCOL DEFINITION This section describes the proposed media access protocol. The protocol is defined here for the single level system and the generalization to multiple level systems is described elsewhere [12]. The traffic characteristics of the system play a crucial role in the access protocol design. Two classes of traffic are defined as in [8] Class A: small amounts of data, such as control information generated by the cache control mechanism and the operating system. Class B: large amounts of ....

....these three schemes is conducted in Section 4.4. Note that with both extensions, the second request may be transmitted in a slot ahead of the first request s allocated slot. To avoid this, an additional queue with one packet capacity may be used. More information on the extensions may be found in [12]. Multi Level Protocols: The protocol described above can easily be extended to operate for the hierarchical architecture as in [8] Each node has a single tunable transmitter with one tunable receiver per level. Each transmitter has a control packet queue for each level and a data packet queue ....

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K. Sivalingam and P. Dowd, "A Lightweight Media Access Protocol for WDM-Based Distributed Shared Memory System," Tech. Rep. 95-15, University of North Carolina at Greensboro,Departmentof Mathematical Sciences, July 1995.

....to the star and a pair of fibers from the star one for local and one for global traffic. The transmission scenario is as follows: Local traffic is transmitted on the local access wavelengths. Since the wavelengths are shared among the local nodes, a media access protocol such as described in [11, 12] is required to arbitrate channel access. The receiver may be fixed as in [11] or tunable as in [12] The coordination between sender and destination is achieved using a reservation phase. Global traffic is transmitted on the global wavelengths using the same transmitter used for local traffic. ....

....scenario is as follows: Local traffic is transmitted on the local access wavelengths. Since the wavelengths are shared among the local nodes, a media access protocol such as described in [11, 12] is required to arbitrate channel access. The receiver may be fixed as in [11] or tunable as in [12]. The coordination between sender and destination is achieved using a reservation phase. Global traffic is transmitted on the global wavelengths using the same transmitter used for local traffic. Reception of global traffic can be accomplished in two ways: i) Allow each node to receive and ....

K. M. Sivalingam and P. W. Dowd, "A lightweight media access protocol for wdm-based distributed shared memory system," in Proceedings of IEEE INFOCOM, (San Francisco, CA), pp. 946--953, Mar. 1996.

....can tune into any channel for transmitting as well as for receiving data. This enables an efficient sharing of chan Corresponding Author. nels amongst the nodes of the network. A reservation based media access control (MAC) protocol for TT TR architecture called LiteMAC has been proposed in [4]. The data transmission in LiteMAC is organized in frames (Fig. 1) where each frame consists of a reservation phase, schedule computation phase and data transmission phase. This paper extends this MAC protocol to allow requests to multiple destinations per reservation. We present a scheduling ....

....architecture described in [10] Here, each level in the network is organized as a star and uses a wavelength partitioner that forwards a set of wavelengths to the upper level and retains the remaining at the current level. The medium access control protocol studied for this architecture is LiteMAC [4]. Transmission in LiteMAC is organized into frames and each frame consists of a control phase (during which reservations are made) a schedule computation phase and a data phase. The control phase operates in a broadcast environment. A control packet sent during the reservation phase transmits a ....

K. M. Sivalingam and P. W. Dowd, "A Lightweight Media Access Protocol for WDM-Based Distributed Shared Memory System," in Proc. IEEE Conference on Computer Communications (INFOCOM), vol. 2, (San Francisco, CA), pp. 946--953, Mar. 1996.

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K. Sivalingam and P. Dowd, "A Lightweight Media Access Protocol for a WDMBased Distributed Shared Memory System.," Proceedings, IEEE INFOCOM '96, San Francisco, pp. 946-953, Mar. 1996.

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