This appears to be a radiogram transmission, typically used by amateur radio operators. Here's a breakdown of the information:

* "23:56" refers to the time of day in 24-hour format.

* "JF7RJM/7" is the call sign of the transmitting station. The "/7" indicates that it's operating on a specific frequency, which in this case is likely an amateur radio band (in Japan, amateur radio operators use the suffix /7 to indicate operation on a specific band).

* "JP-1070" refers to the location of the transmitter, Shonai Kaihin Prefectural Nature Park.

* "21048.0 CW" indicates that the transmission is using continuous wave (CW) mode and is operating at 21,048 Hz.

* "RBN" stands for Reverse Beacon Network, which is a system used by amateur radio operators to alert other stations of activity on specific frequencies.

* "15 dB" refers to the signal strength or noise level in decibels.

* "22 WPM" indicates that the transmission is at 22 words per minute.

* "via BD7JNA-#[BD7JNA-#]" suggests that this transmission was received and relayed through a station called BD7JNA. The "#[...]" part is likely an identifier or hash tag.

This message seems to be reporting a CW signal activity on 21,048 Hz frequency, with some details about the signal strength and other relevant information for amateur radio operators.