1-58. (canceled)
59. a method comprising:
communicatively coupling a first zone of a network to a second zone of said network using a first boundary node, wherein
said first zone comprises,
a first end node of a virtual circuit, and
said first boundary node,
said second zone comprises,
a second end node of said virtual circuit, and
said virtual circuit comprises a physical circuit between said first end node and said first boundary node;
detecting a failure within said physical circuit using said first boundary node; and
restoring said virtual circuit using said first boundary node in response to said detecting.
60. The method of claim 59 wherein
said network comprises a plurality of network nodes,
said first zone further comprises,
a first plurality of said network nodes, and
a first plurality of intra-zone links, wherein
each one of said first plurality of said network nodes is coupled to at least one other of said first plurality of said network nodes by at least one of said first plurality of intra-zone links, and
said first plurality of said network nodes comprises said first end node and said first boundary node, and
said second zone further comprises,
a second plurality of said network nodes, and
a second plurality of intra-zone optical links, wherein
each one of said second plurality of said network nodes is coupled to at least one other of said second plurality of said network nodes by at least one of said second plurality of intra-zone optical links,
said second plurality of said network nodes comprises said second end node and a second boundary node, and
said first boundary node is coupled to said second boundary node by an inter-zone link.
61. The method of claim 60, wherein
said communicatively coupling comprises:
maintaining topological data on said first boundary node, said topological data including intra-zone network topology information and excluding extra-zone network topological information, and
said intra-zone network topology information comprises information regarding said first plurality of said network nodes and said first plurality of intra-zone optical links, and
said extra-zone network topology information comprises information regarding said second plurality of said network nodes and said second plurality of intra-zone optical links.
62. The method of claim 61, wherein
said topological data further includes inter-zone network topology information, and
said inter-zone network topology information comprises information regarding said boundary nodes and said inter-zone link.
63. The method of claim 60, wherein said detecting comprises
receiving a restoration message at said first boundary node on behalf of said second end node.
64. The method of claim 63, wherein said receiving comprises
receiving an alarm indication signal at said first boundary node.
65. The method of claim 60, wherein said restoring comprises
allocating a partial physical circuit between said first end node and said first boundary node.
66. An apparatus comprising:
means for communicatively coupling a first zone of a network to a second zone of said network, wherein
said first zone comprises,
a first end node of a virtual circuit, and
a first boundary node,
said second zone comprises,
a second end node of said virtual circuit, and
said virtual circuit comprises a physical circuit between said first end node and
said first boundary node;
means for detecting a failure within said physical circuit; and
means for restoring said virtual circuit using said first boundary node in response to said failure.
67. The apparatus of claim 66, wherein
said network comprises a plurality of network nodes,
said first zone further comprises,
a first plurality of said network nodes, and
a first plurality of intra-zone links, wherein
each one of said first plurality of said network nodes is coupled to at least one other of said first plurality of said network nodes by at least one of said first plurality of intra-zone links, and
said first plurality of said network nodes comprises said first end node and said first boundary node, and
said second zone further comprises,
a second plurality of said network nodes, and
a second plurality of intra-zone optical links, wherein
each one of said second plurality of said network nodes is coupled to at least one other of said second plurality of said network nodes by at least one of said second plurality of intra-zone optical links,
said second plurality of said network nodes comprises said second end node and a second boundary node, and
said first boundary node is coupled to said second boundary node by an inter-zone link.
68. The apparatus of claim 67, wherein
said means for communicatively coupling comprises:
means for maintaining topological data on said first boundary node, said topological data including intra-zone network topology information and excluding extra-zone network topological information, and
said intra-zone network topology information comprises information regarding said first plurality of said network nodes and said first plurality of intra-zone optical links, and
said extra-zone network topology information comprises information regarding said second plurality of said network nodes and said second plurality of intra-zone optical links.
69. The apparatus of claim 68, wherein
said topological data further includes inter-zone network topology information, and
said inter-zone network topology information comprises information regarding said boundary nodes and said inter-zone link.
70. The apparatus of claim 67, wherein said means for detecting comprises
means for receiving a restoration message at said first boundary node on behalf of said second end node.
71. The apparatus of claim 70, wherein said means for receiving comprises
means for receiving an alarm indication signal at said first boundary node.
72. The apparatus of claim 67, wherein said means for restoring comprises
means for allocating a partial physical circuit between said first end node and said first boundary node.
73. A network comprising:
a first zone comprising,
a first end node of a virtual circuit, and
a first boundary node, wherein
said virtual circuit comprises a physical circuit between said first end node and said first boundary node; and
a second zone comprising,
a second end node of said virtual circuit, wherein
said first boundary node is configured to communicatively couple said first zone to said second zone, to detect a failure within said physical circuit, and to restore said virtual circuit in response to said failure.
74. The network of claim 73, wherein
said network comprises a plurality of network nodes,
said first zone further comprises,
a first plurality of said network nodes, and
a first plurality of intra-zone links, wherein
each one of said first plurality of said network nodes is coupled to at least one other of said first plurality of said network nodes by at least one of said first plurality of intra-zone links, and
said first plurality of said network nodes comprises said first end node and said first boundary node, and
said second zone further comprises,
a second plurality of said network nodes, and
a second plurality of intra-zone optical links, wherein
each one of said second plurality of said network nodes is coupled to at least one other of said second plurality of said network nodes by at least one of said second plurality of intra-zone optical links,
said second plurality of said network nodes comprises said second end node and a second boundary node, and
said first boundary node is coupled to said second boundary node by an inter-zone link.
75. The network of claim 74, wherein
said first boundary node is further configured to maintain topological data, said topological data including intra-zone network topology information and excluding extra-zone network topological information,
said intra-zone network topology information comprises information regarding said first plurality of said network nodes and said first plurality of intra-zone optical links, and
said extra-zone network topology information comprises information regarding said second plurality of said network nodes and said second plurality of intra-zone optical links.
76. The network of claim 75, wherein
said topological data further includes inter-zone network topology information, and
said inter-zone network topology information comprises information regarding said boundary nodes and said inter-zone link.
77. The network of claim 74, wherein said first boundary node is further configured to receive a restoration message at said first boundary node on behalf of said second end node.
78. The network of claim 77, wherein said restoration message comprises an alarm indication signal.
79. The network of claim 74, wherein said first boundary node is further configured to allocate a partial physical circuit between said first end node and said first boundary node in response to said failure.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
What is claimed:
1. A bearing apparatus for a camshaft disposed in a cylinder head in an engine comprising:
a bearing cap fastened to the cylinder head to fix relative position of the camshaft to the cylinder head; and
a cap bolt that fastens the bearing cap to the cylinder head wherein the bearing cap comprises:
a cylinder-head meeting surface connected to the cylinder head;
a first wall that forms a bolt insert bore therein where the cap bolt is inserted; and
a second wall that forms part of the first wall; the second wall forming an oil escape bore to penetrate therethrough, wherein the oil escape bore is formed with a distance from the cylinder-head meeting surface, and connects the bolt insert bore to an outside space of the bearing cap.
2. A bearing apparatus according to claim 1, wherein
the cap bolt comprises a cap bolt head that is exposed to an engine room
3. A bearing apparatus according to claim 1, wherein
the second wall forms the oil escape bore that is connected to an oil pan as the outside space of the bearing cap.
4. A bearing apparatus according to claim 1, wherein
the second wall forms the oil escape bore that is connected to an inside space of a chain casing as the outside space of the bearing cap, wherein the chain casing houses a timing chain that delivers engine power to the camshaft.
5. A bearing apparatus according to claim 1, wherein
the first wall forms the bolt insert bore that has a lower portion having a first diameter portion and an upper portion having a second diameter, the first diameter being larger than the second diameter, further comprising:
a positioning collar disposed in the lower portion and engaged therewith to position the bearing cap to the cylinder head.
6. A bearing apparatus according to claim 5, wherein
the second wall forms the oil escape bore that is opened to the bolt insert bore above an upper end of the positioning collar.
7. A bearing apparatus according to claim 5, wherein
the second wall forms the oil escape bore that is opened to the lower portion.
8. A bearing apparatus according to claim 1, wherein
the cap bolt has a screw portion having a mesh portion with the cylinder head and a non-mesh portion therewith, and the oil escape bore is opened to the bolt insert bore to be directed to the non-mesh portion.
9. A bearing apparatus according to claim 5, wherein
the cap bolt has a screw portion having a mesh portion with the cylinder head and a non-mesh portion therewith, and the oil escape bore is opened to the lower portion of the bolt insert bore to be directed to the non-mesh portion.