1. A system for implementing a radio over fiber (RoF) transmission in a passive optical network (PON), said passive optical network comprising
a trunk line,
a remote optical node, which is connected to said trunk line, and
a plurality of leaf nodes connected to said remote optical node and via said remote optical node to said trunk line, wherein
one of said plurality of leaf nodes comprises a baseband processing unit for performing a baseband processing on a signal received via said trunk line and said remote optical node to perform the transformation to radio over fiber by generating a radio over fiber signal and to forward the resulting radio over fiber signal to said remote optical node, wherein
said remote optical node is adapted to forward the radio over fiber signal received from said leaf node to the other leaf nodes of said passive optical network.
2. The system of claim 1, wherein
one or more of said other leaf nodes comprise a remote radio head to transmit the received radio over fiber signal as a radio signal.
3. The system of claim 1, wherein
said signal which is received via said trunk line by said one of said plurality of leaf nodes is a signal received from the core network of a mobile network operator.
4. The system of claim 3, wherein said signal which is received via said trunk line is a S1 signal.
5. The system of claim 1, wherein
said radio over fiber signal generated in said one of said plurality of leaf nodes is transmitted in a waveband range outside the bands suitable for covering a range which includes the length of the trunk line and a leaf line but in a band suitable for covering a range communication covering the length which includes the distance from one leaf node to another leaf node via said remote optical node.
6. The system of claim 1, wherein a length of said trunk line is longer than a length from the remote optical node to a leaf node.
7. The system of claim 1, wherein
said passive optical network is shared between a fixed and a mobile operator such that
the fixed operator uses the PON to transmit FTTH signals, and
the mobile operator uses the PON, the remote optical node and the leaf nodes to transmit a signal from its core to said one of said leaf nodes and radio over fiber signals from said one of said leaf nodes to other ones of said leaf nodes via said remote optical node.
8. The system of claim 1, wherein the RoF signal is transmitted in analogue form.
9. A system for implementing a radio over fiber (RoF) transmission, said system comprising:
One or more first systems according to claim 1;
One or more second systems for implementing a RoF transmission, wherein a baseband processing unit is located at an optical line terminal, remote radio heads are located at PON leaf nodes, and the RoF signals are transmitted from the optical line terminal to the leaf nodes via the trunk line and the leaf lines of the PON.
10. The system of claim 9, wherein
the one or more first systems are used to cover areas which are more far away from the optical line terminal;
the one or more second systems are used to cover areas which are less far away from the optical line terminal.
11. A method for implementing a radio over fiber (RoF) transmission in a passive optical network (PON), said passive optical network comprising
a trunk line,
a remote optical node, which is connected to said trunk line, and
a plurality of leaf nodes connected to said remote optical node and via said remote optical node to said trunk line, said method comprising:
performing a baseband processing in a baseband processing unit of one of said plurality of leaf nodes on a signal received via said trunk line and said remote optical node to perform the transformation to radio over fiber by generating a radio over fiber signal;
forwarding the resulting radio over fiber signal to said remote optical node, and
forwarding the radio over fiber signal received from said at least one leaf node by said remote optical node to the other leaf nodes of said passive optical network.
12. The method of claim 11, wherein
one or more of said other leaf nodes comprise a remote radio head to transmit the received radio over fiber signal as a radio signal.
13. The method of claim 11, wherein
said signal which is received via said trunk line by said one of said plurality of leaf nodes is a signal received from the core network of a mobile network operator.
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. A timepiece comprising
an annular case band having a front side end part defining a fitting hole, an annular engaging groove formed in the front side end part and opening to the fitting hole, and an edge receiving face extending around the fitting hole;
a case back detachably attached to a back side end part of the case band;
an annular edge member having a tubular part removably inserted into and removable from the fitting hole, a cover part overlapped with the edge receiving face, an annular attaching groove opening to an inner periphery face of the tubular part, and plural through-holes communicating the attaching groove and the engaging groove;
a glass fitted and fixed to an annular step part formed in the edge member; and
a C-shaped spring member detachably attached to the attaching groove of the edge member and having plural convex parts extending through respective ones of the through-holes into the engaging groove of the case band.
2. A timepiece according to claim 1, further including an annular seal packing nipped between the edge receiving face and the cover part in a compressed state.
3. A timepiece according to claim 1, wherein at least one end part of the spring member protrudes to an inside of the tubular part and constitutes an operating part when detaching the spring member from the attaching groove.
4. A timepiece according to claim 1, wherein the glass is fixed to the annular step part by an adhesive.