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US requirements Under United States ... CRC Press. ISBN 978-1-56670 ... (1993). "Exits and Egress". Simplified design for building fire safety. Parker-Ambrose series ...
To compute an n-bit binary CRC, line the bits representing the input in a row, and position the (n + 1)-bit pattern representing the CRC's divisor (called a "polynomial") underneath the left end of the row. In this example, we shall encode 14 bits of message with a 3-bit CRC, with a polynomial x 3 + x + 1.
One of the most commonly encountered CRC polynomials is known as CRC-32, used by (among others) Ethernet, FDDI, ZIP and other archive formats, and PNG image format. Its polynomial can be written msbit-first as 0x04C11DB7, or lsbit-first as 0xEDB88320.
By making it possible to put in a larger window, the window can act as a safer emergency exit in case of fire as well as letting in additional daylight for the enjoyment of the people inside. Such a (basement) window where people can escape through in case of an emergency is sometimes called an egress window. [1]
Both the 2012 IBC and 2012 IRC require emergency escape and rescue openings for residential buildings of 4 floors or fewer, in sleeping rooms and basements with habitable space, for means of emergency egress. A fire escape can be a window, and if above the first floor with an approved ladder, or door that leads to a porch with ground access or ...
These inversions are extremely common but not universally performed, even in the case of the CRC-32 or CRC-16-CCITT polynomials. They are almost always included when sending variable-length messages, but often omitted when communicating fixed-length messages, as the problem of added zero bits is less likely to arise.