Abstract: A walker comprises: a cross brace having an end sleeve on each end, N-shaped leg extensions, a lock body having a housing and a block having an axis hole, wherein the leg extension is covered by the end sleeve, the lock body is provided on top of the end sleeve, the leg extension and the lock body are provided with a pin hole and a connecting pin hole respectively at corresponding positions and fixed by a lock pin, the housing of the lock body is provided with a hole for sub axis, the block is connected inside the housing by a sub axis passing through the hole for sub axis and the axis hole, the end sleeve is provided with an orientation hole, a flange for fitting with the orientation hole is provided at the bottom of the block in the housing, a stretch part with a bearing rod is provided inside the leg extension, and the bearing rod leans against the upper portion of the block above the axis hole by passing through a through hole on the leg extension.

Abstract: The present utility model disclosed a main support frame, which has two bushings each set on the right and left side of said main support frame respectively; two supporting pipes, each inserted in one of the bushings of the main support frame; two P-shaped armrests, each connects with one of the supporting pipes; two pairs of front-wheel assembly and rear wheel assembly, each pair of front-wheel assembly and rear wheel assembly is connected with the main support frame; and a seat component comprising a seat body and a folding mechanism, said seat component can be folded in the middle and is set between the left side and right side of main support frame. Said folding mechanism consists of a first branch pipe and a second branch pipe, which hinge joint with each other in the middle, one end of the first branch pipe and the second branch pipe hinge joint with the left side and right side of the main support frame respectively, the other end connect with the two ends of said seat body respectively.

Abstract: An apparatus and method of determining throughput between a first host and a second host of at least one network is disclosed. The method includes the first host intentionally corrupting ICMP packets by manipulating a checksum of the ICMP packets. The first host sends the corrupted ICMP packets to the second host through the at least one network. The first host additionally sends non-corrupted ICMP packets to the second host. Based on responses from second host to the ICMP packets, the first host estimates a throughput between the first host and the second host. The throughput includes a first direction throughput from the first host to the second host, a second direction throughput from the second host to the first host, and a round trip throughput between the first host and the second host.

Abstract: Digital telephone apparatus suitable for use as a subscriber station as well as for an attendant console. The telephone apparatus is connectable for full duplex communication with a four wire telephone transmission line. The telephone apparatus is capable of transmitting PCM speech data and/or digital data from a digital data interface to a peripheral data system. The telephone apparatus comprises an internal data bus to which are connected a digital transceiver, a sync/signalling generator, a serial frame synchronizer and at least one codec/PCM filter. The transceiver transmits and receives digital data to and from the telephone transmission line. The sync/signalling generator repeatedly supplies an 8 bit first data word to the internal data bus containing a binary synchronizing code and a signalling code. Simultaneously, the serial frame synchronizer repeatedly receives from the data bus and decodes an 8 bit first data word containing a synchronizing code and a signalling code.