A silver halide photographic emulsion which comprises at least one methine compound represented by the following formula : . This can be used as a template layer for high In composition devices. The power output unit is centered at a Z-axis, and is disposed in the first accommodating chamber for power outputting. At least one probe pulse train is generated having one or more probe pulses. When the mobile station attempt to access the wireless network, the access request can be serviced based on the priority of the mobile station.