1. A time division multiplexing communication system, comprising:
a plurality of communication devices;
a switch device having a plurality of terminals to which at least the plurality of communication devices are respectively connected, a switch unit capable of mutually connecting all of the plurality of terminals and individually connecting the plurality of terminals, and a switch control unit of controlling a connection status of the switch unit; and
a transmittal right control unit for managing the connection status of the switch unit, which is connected to at least one of the plurality of terminals, for (a) receiving, from the communication device, a request for time to communicate with another communication device, with all of the plurality of terminals being mutually connected, and determining allocation of the time to communicate among the communication devices at the request, (b) notifying each of the communication devices of the allocation of the determined time, and (c) instructing the switch control unit such that connections at the switch unit are conducted in a way that signals among the communication devices in a plurality of different combinations communicated in the same time period do not interfere with each other.
2. The time division multiplexing communication system according to claim 1, wherein
the plurality of communication devices and the transmittal right control unit are respectively connected to the plurality of terminals through a coaxial cable.
3. The time division multiplexing communication system according to claim 1, wherein
signals used in communication between the communication devices are signals at the same frequency band.
4. A time division multiplexing communication switch system, comprising:
a plurality of terminals to which a plurality of communication devices are respectively connected;
a switch unit capable of individually connecting the plurality of terminals;
a switch control unit of controlling a connection status of the switch unit; and
a transmittal right control unit for managing the connection status of the switch unit, which is connected to each of the plurality of terminals, for (a) receiving, from the communication device, a request for time to communicate with another communication device, and determining allocation of the time to communicate among the communication devices at the request, (b) notifying each of the communication devices of the allocation of the determined time, and (c) instructing the switch control unit such that connections at the switch unit are conducted in a way that signals among the communication devices in a plurality of different combinations communicated in the same time period do not interfere with each other.
5. The time division multiplexing communication switch system according to claim 4, wherein
the plurality of communication devices are respectively connected to the plurality of terminals through a coaxial cable.
6. The time division multiplexing communication switch system according to claim 4, wherein
signals used in communication between the communication devices are signals at the same frequency band.
7. A communication control method of a communication system performing communications, among a plurality of communication devices connected in the system, time division multiplexing, the communication control method comprising:
a determination notification step for (a) receiving, from the communication device, a request for time to communicate with another communication device, with all of a plurality of terminals to which at least the plurality of communication devices are connected being mutually connected, (b) determining allocation of the time to communicate among the communication devices at the request, and (c) notifying each of the communication devices of the allocation of the determined time; and
a control step for individually controlling a connection between the plurality of terminals such that signals among the communication devices in a plurality of different combinations communicated in the same time period do not interfere with each other.
8. A communication control method of a communication system performing communications, among a plurality of communication devices connected in the system, by time division multiplexing, the communication control method comprising:
a determination notification step for (a) receiving, from the communication device, a request for time to communicate with another communication device, with the plurality of communication devices being respectively connected to a plurality of terminals, (b) determining allocation of the time to communicate among the communication devices at the request, and (c) notifying each of the communication devices of the allocation of the determined time; and
a control step for individually controlling a connection between the plurality of terminals such that signals among the communication devices in a plurality of different combinations communicated in the same time period do not interfere with each other.
9. A computed readable medium including a program used to direct a computer to function as:
the switch control unit of controlling the connection status of the switch unit; and
the transmittal right control unit of determining the assignment of a time to communicate among the communication devices, and instructing the switch control unit,
which belong to the time division multiplexing communication switch system according to claim 1.
10. (canceled)
11. A computer readable medium including a program used to direct a computer to function as:
the switch control unit of controlling the connection status of the switch unit; and
the transmittal right control unit of determining the assignment of a time to communicate among the communication devices, and instructing the switch control unit,
which belong to the time division multiplexing communication switch system according to claim 4.
12. (canceled)
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An optical transceiver capable of inserting into or extracting from a cage installed on a host system so as to expose one end portion thereof from a face panel of the host system to receive an optical connector and to provide an electrical connector in the other end thereof to be mated with the optical transceiver by a hot-pluggable configuration, the optical transceiver comprising:
an optical assembly unit including,
an optical receptacle to receive the optical connector therein, and
an optical subassembly having a semiconductor device therein to couple in optical to an optical fiber secured in the optical connector; and
a body unit including,
a substrate providing an electrical plug in one end thereof to mate with the electrical connector within the cage, and mounting an electronic circuit thereon electrically connected to the semiconductor device within the optical subassembly and the electrical plug, the;
a heat conducting plate to be in contact to the electronic circuit,
a metal base including first and second portions, the first portion mounting the substrate and the second portion being fitted to the heat conducting plate, and
a metal cover for putting the optical subassembly, the substrate, the base and the heat conducting plate therein,
wherein the optical subassembly, the substrate, the base and the heat conducting plate are arranged in longitudinal of the transceiver, and
the heat conducting plate is in contact to the cage at a rear end of the transceiver to conduct heat generated in the electronic circuit to the cage.
2. The optical transceiver according to claim 1,
wherein the heat conducting plate includes first to third portions arranged in longitudinal in this order, the first portion being opened upward to be in contact to the electronic circuit and the second portion being opened downward to fit the base thereto, the third portions being in contact to the cage, and
wherein the heat conducting plate has a zigzag shaped cross section.
3. The optical transceiver according to claim 1,
wherein the heat conducting plate includes first to third portions the first portion being in contact to the electronic circuit, the second portion being in substantially parallel to the first portion and covering a rear portion of the first portion to fit the base thereto, and the third portion connecting the first portion to the second portion at the rear end of the transceiver to be in contact to the cage, and
wherein the heat conducting plate has a U-shaped cross section.
4. The optical transceiver according to claim 3,
wherein the heat conducting plate is made from a metal plate by cutting, bending and tapping, and made of copper based alloy.
5. The optical transceiver according to claim 3,
wherein the heat conducting plate is in contact to the electronic circuit via a thermal sheet made of resin with a good thermal conductivity.
6. The optical transceiver according to claim 3,
wherein the optical subassembly includes a stem for mounting the semiconductor device thereon, the stem being thermally in contact to the base via a thermal sheet.
7. The optical transceiver according to claim 1,
wherein the optical subassembly includes a stem for mounting the semiconductor device thereon, the stem being exposed between the optical receptacle and the substrate, and
wherein the optical transceiver further includes a thermal sheet made of resin between the optical receptacle and the substrate to conduct heat from the step to the cover.
8. The optical transceiver according to claim 1,
wherein the optical subassembly includes a stem for mounting the semiconductor device thereon, the optical transceiver further includes a thermal sheet made of resin and a metal bracket attached to the stem, the bracket being thermally contact to the substrate and to the cover via the thermal sheet put between the cover and the stem.
9. The optical transceiver according to claim 1,
wherein the cover provides a plurality of structures with a pair of slit and a portion between the paired slits that is bent inward, the bent portion being in contact to the heat conducting plate.
10. The optical transceiver according to claim 9,
wherein the heat conducting plate provides a support post bent upward with an abutting surface in the tip thereof, the bent portion of the cover being in contact to the abutting surface to conduct heat from the heat conducting plate to the cover.
11. The optical transceiver according to claim 1, wherein the cover provides a tab in a side where the optical assembly unit is attached, the tab being in contact to the cage when the transceiver is set within the cage.