1. A ladder retaining bracket comprising:
a base plate comprising an inside surface, an outside surface, a first side, a second side, a top end and a bottom end;
at least one first retainer plate attached to the inside surface on the first side of the base plate forming a first channel in between the at least one first retainer plate and the base plate;
at least one second retainer plate attached to the inside surface on the second side of the base plate forming a second channel in between the at least one second retainer plate and the base plate;
wherein the first channel and the second channel are disposed an angle relative to one another,
wherein the first channel and the second channel are sized to receive ends of side rails of a ladder and are configured to retain the ends of the side rails within.
2. The ladder retaining bracket of claim 1, comprising two ladder retaining brackets.
3. The ladder retaining bracket of claim 1, wherein the at least one first retainer plate comprises two first retainer plates aligning to form the first channel, wherein a top rung of a ladder is formed to fit in between the two first retainer plates.
4. The ladder retaining bracket of claim 3, wherein the at least one second retainer plate comprises two second retainer plates aligning to form the second channel, wherein a top rung of a ladder is formed to fit in between the two second retainer plates.
5. The ladder retaining bracket of claim 1, further comprising a first U-bracket forming the first channel and attached to the inside surface of the base plate, in between the at least one first retainer plate and the base plate, and a second U-bracket forming the second channel and attached to the inside surface of the base plate, in between the at least one second retainer plate and the base plate.
6. The ladder retaining bracket of claim 1, wherein the distance between the retainer plates and the base plate is adjustable.
7. The ladder retaining bracket of claim 7, wherein the retainer plates are attached the base plates by a plurality of threaded bolts and a plurality of threaded wing nuts.
8. A method of attaching two ladders together comprising:
providing a ladder retaining bracket comprising:
a base plate; and
two retainer plates attached to the base plate forming a first channel and a second channel;
securing a first end of a first side rail of a first ladder into the first channel; and
securing a first end of a first side rail of a second ladder in the second channel.
9. The method of claim 8, further comprising attaching a second ladder retaining bracket to opposite side rails of the first ladder and the second ladder.
10. The method of claim 8, wherein the two retainer plates are attached to the base plate by a plurality of threaded bolts and a plurality of threaded wing nuts.
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 of communicating in a wireless local area network, the method comprising:
receiving a first transmission from an originator in the wireless local area network, the first transmission comprising a single transmission having an aggregated block of a plurality of data frames each data frame including a medium access control (MAC) header, wherein the first transmission does not include a separate block acknowledgement request (BlockAckReq) frame;
identifying an acknowledgement policy solicited by the originator in a quality of service (QoS) field as a BlockAck policy or a Normal acknowledgement policy in at least one of the MAC headers of the received first transmission; and
transmitting a single block acknowledgement (BlockAck) to the originator acknowledging receipt of one or more of the plurality of data frames in the aggregated block of data frames.
2. The method of claim 1 further comprising identifying in the BlockAck which of the plurality of data frames in the received first transmission were received without error.
3. The method of claim 1 further comprising:
receiving a second transmission from the originator including a repeat of only those of the plurality of data frames in the aggregated block of the first transmission, if any, which were not correctly received in the first transmission.
4. The method of claim 1 further comprising:
determining that the received first transmission is a transmission with the aggregated block of the plurality of data frames and not a conventional transmission having a single data frame.
5. A wireless communication device comprising:
a receiver configured to receive and demodulate a first wireless transmission from an originator, the first wireless transmission comprising a single transmission including an aggregated block of a plurality of data frames, with each data frame including a respective medium access control (MAC) header;
a processor coupled to the receiver to identify an acknowledgement policy solicited by the originator in a quality of service (QoS) field as a BlockAck policy or a Normal acknowledgement policy in at least one of the MAC headers of the received transmission and to prepare a block acknowledgment (BlockAck) message acknowledging receipt of the plurality of data frames of the aggregated block in a single frame; and
a transmitter coupled to the processor to modulate and transmit the block acknowledgement to the originator.
6. The device of claim 5 wherein the receiver and transmitter are configured to receive and transmit utilizing protocols in conformance with an Institute of Electrical and Electronics Engineers (IEEE) 802.11n standard.
7. The device of claim 5 wherein the receiver includes multiple antennas.