1. A camera comprising: a rotary operation dial to be operated rotationally; a locking function for locking said rotary operation dial relative to a predetermined position; and a body case to be fitted with said rotary operation dial, wherein said rotary operation dial comprises: a dial body; a rotary operation portion positioned on the periphery of said dial body; a lock lever part formed by notching circumferential part of said dial body, said lock lever part including part of said rotary operation portion; and a connecting part for connecting said lock lever part and said dial body with each other, said rotary operation dial being made of elastic body in an integrated manner, and wherein an operation lever and a hook are formed in said lock lever part in such a manner as to lie, respectively, outside and inside of said body case, said hook being adapted to be fitted into a lock groove formed inside said body case, and also to be moved in a direction opposite to said operation lever around said connecting part in accordance with an operation of said operation lever.
2. A camera comprising: a rotary operation dial to be operated rotationally; a locking function for locking said rotary operation dial relative to a predetermined position; and a body case to be fitted with said rotary operation dial, wherein said rotary operation dial is made of elastic body in an integrated manner, said rotary operation dial comprising a lock lever part having an operation lever and a hook which lie, respectively, outside and inside of said body case relative to said rotary operation dial, said hook being adapted to be fitted into a lock groove formed inside said body case.
3. The camera according to claim 1, wherein said rotary operation dial is made of synthetic resin in an integrated manner.
4. The camera according to claim 3, wherein said synthetic resin is acrylonitrile-butadiene-styrene resin.
5. The camera according to claim 1, wherein ribs are provided inside said body case to form said lock groove.
6. The camera according to claim 5, wherein an inclined portion, across which said hook slides when moving toward said lock groove, is formed in each of said ribs.
7. The camera according to claim 5, wherein said ribs are each formed in a strip shape.
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 method, comprising:
receiving, by a router, a packet stream including a plurality of packets;
determining, by the router, a level of service to be provided to the packet stream, wherein the determining the level of service to be provided to the packet stream comprises determining an address to which the packet stream is addressed, wherein the address is a destination internet protocol address;
selecting, by the router, an impairment from a plurality of impairments to introduce to the packet stream as a function of the level of service, wherein each of the plurality of impairments is an additional impairment over an ambient impairment experienced by the packet stream, wherein the plurality of impairments includes a delay, a jitter and a packet loss;
introducing, by the router, the impairment that is selected to the packet stream, wherein the impairment that is selected is introduced by a buffer of a plurality of buffers of the router, wherein the plurality of buffers of the router comprise:
a first buffer for introducing the delay;
a second buffer for introducing the jitter; and
a third buffer for introducing the packet loss; and
outputting, from the router, the packet stream that has been impaired.
2. The method of claim 1, further comprising:
generating a service metric for the packet stream.
3. The method of claim 2, wherein the service metric indicates the level of service applied to the packet stream.
4. The method of claim 1, wherein the plurality of packets includes voice over internet protocol packets.
5. The method of claim 1, wherein the level of service is defined in a service level agreement with a customer receiving the packet stream.
6. The method of claim 1, wherein the determining of the level of service further comprises:
determining a port number for the packet stream.
7. The method of claim 1, wherein the determining of the level of service further comprises:
determining a payload of the packet stream.
8. A device, comprising:
a packet classifier for receiving a packet stream including a plurality of data packets and classifying the packet stream based on a level of service to be provided to the packet stream, wherein the packet classifier classifies the level of service by determining an address to which the packet stream is addressed, wherein the address is a destination internet protocol address;
a plurality of buffers, where each buffer is for introducing a different impairment of a plurality of impairments to the packet stream as a function of the level of service to be provided to the packet stream, wherein each of the plurality of impairments is an additional impairment over an ambient impairment experienced by the packet stream, wherein the plurality of impairments includes a delay, a jitter and a packet loss, the plurality of buffers comprising:
a first buffer for introducing the delay;
a second buffer for introducing the jitter; and
a third buffer for introducing the packet loss; and
a buffer controller, coupled to the plurality of buffers, for selecting one of the plurality of impairments and for controlling a duration of the one of the plurality of impairments that is selected, wherein the device comprises a router.
9. The device of claim 8, further comprising:
a controller generating a service metric for the packet stream.
10. The device of claim 9, wherein the service metric indicates the level of service applied to the packet stream.
11. The device of claim 8, wherein the plurality of packets includes voice over internet protocol packets.
12. The device of claim 8, wherein the level of service is defined in a service level agreement with a customer receiving the packet stream.
13. The device of claim 8, wherein the device outputs the packet stream that has been impaired to a user device.
14. The device of claim 8, wherein the packet classifier determines whether the packet stream has been previously impaired by another device.
15. A router comprising:
a processor; and
a memory storing instructions which, when executed by the processor, cause the processor to perform operations, the operations comprising:
receiving a packet stream including a plurality of packets;
determining a level of service to be provided to the packet stream, wherein the determining the level of service to be provided to the packet stream comprises determining an address to which the packet stream is addressed, wherein the address is a destination internet protocol address;
selecting an impairment from a plurality of impairments to introduce to the packet stream as a function of the level of service, wherein each of the plurality of impairments is an additional impairment over an ambient impairment experienced by the packet stream, wherein the plurality of impairments includes a delay, a jitter and a packet loss;
introducing the impairment that is selected to the packet stream, wherein the impairment that is selected is introduced by a buffer of a plurality of buffers of the router, wherein the plurality of buffers of the router comprise:
a first buffer for introducing the delay;
a second buffer for introducing the jitter; and
a third buffer for introducing the packet loss; and
outputting, from the router, the packet stream that has been impaired.
16. The router of claim 15, wherein the operations further comprise:
generating a service metric for the packet stream.