Mr. Cosby had asked to be released on bail while he appeals his conviction, but the judge denied his request. So the former entertainer, who had been allowed to stay at his home in Montgomery County while awaiting sentencing, is now occupying a single 7-by-13-foot cell with a 10-foot ceiling, near the infirmary.

Mr. Cosby will be eligible to make phone calls and to receive one visit on each visitation day of up to five people at a time, not including attorneys. Physical contact is permitted during the supervised visits, as it is in all Pennsylvania correctional institutions.

Image A typical cell at SCI Phoenix, with room for two inmates. Mr. Cosby has not been given a cellmate yet because of security concerns. Credit... Pennsylvania Department of Corrections

Only lawyers and religious advisers will be allowed to visit Mr. Cosby for his first 10 days of incarceration, a standard practice, according to Amy Worden, the spokeswoman for the state Department of Corrections.