December 2001
Intermediate to advanced
656 pages
27h 19m
English
Content preview from Networking Explained, 2nd Edition
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216 Networking Explained, Second Edition
6. What about a printer cable connector or a modem cable connector? Do they also
operate at the physical layer?
You are referring to DB (data bus) and DIN (Deutsche Industrie Norm, a German indus-
trial standard) connectors. DB connectors serve as an interface between a computer and a
peripheral device such as a printer or external modem. Several types of DB connectors
exist and are distinguished by the number of “pins” they contain. Common types include
DB-9 (a 9-pin serial or video interface), DB-15 (a 15-pin video interface), DB-25 (a 25-
pin serial interface—RS-232—or parallel printer interface), and DB-37 ...
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