.Belkin, CompuCable, CTG.

DB9F / DB25M Connection Cable ( External Modem to Computer DB9 plug )

• F2L088-01 - Price Check (street price $4) - AT Serial Modem Cable, DB25M - DB9F, 1 foot, 24K gold plated copper connectors, thumbscrews, 28 AWG stranded tinned copper
• F2L088-06 - Price Check (street price $5) - 6' IBM Serial Modem Cable - DB9 Female to DB25 Male
• F2L088-10 - Price Check (street price $6) - 10' IBM Serial Modem Cable - DB9 Female to DB25 Male

DB25F / DB25M Connection Cable-

• F2J088-06 - Price Check (street price $4) - 6' IBM Serial Modem Cable - DB25 Female to DB25 Male

DB9F / DB9M Extension Cable -

• F2N209-06-T - Price Check (street price $6) - 6' IBM Serial Modem Cable - DB9 Female to DB9 Male, with Thumbscrews

DB-9 Female toDB-9 Male Extension Cable

• none listed at this time

• 02518 - Price Check (street price $4) - Cables To Go Modem Cable DB9F/DB25M 6', Connects an external modem to a PC computer via the DB9 serial port, Connectors: DB9 Female to DB25 Male, color Beige

Note on Modem Cables -

Only external modems need the above cables. Most of the modems sold do not include this cable which is used to connect the external modem to the back of the computer. A separate cable (provided with the modem) is used to connect the modem to the telephone outlet.

A Typical modem cable would have a DB-9 Female connector on one end and a DB-25 Male connector on the other end (DB9F - DB25M). These cables are identified as "Connection Cables" on the above list.

• A typical computer has a Serial Port with a Male connector which can have be either a 9-pin or 25-pins. So one end of the cable would be a DB9F or DB25F from the above listing. 
• A typical modem has a 25-pin Female connector.

Connection Cables - Connect the modem to the computer

• The cables with the DB-25 Female connector (DB25F-DB25M) are also called XT cables because the XT style computers used this connector.
• The cables using DB-9 Female connectors (DB9F-DB25M) are called AT cables since the (at that time) newer AT computers used it..

Extension Cables - Extension cables can also be used to allow the modem to be placed further from the computer.

• DB9M-DB9F
• DB9M-DB25

Adapter Cables - Convert an older style (XT) computer serial port to accept the newer style (AT) cables. An adapter used in conjunction with an older style cable would only be needed if you already had the cable. When getting a new cable it would make more sense to buy one that has the proper fittings rather then to buy a cable and an adapter.

• DB9M-DB25F or Adapter Cables can also be used for computers that have the older DB25 connectors.

Therefore a typical cable would be either a DB9F / DB25M or a DB25F / DB25M.