Farallon Communications 612, 412 manual Terms used in this user’s guide, Isdn BRI

Setting Up ISDN Service 2-5

Terms used in this user’s guide

The following ISDN-related terms are used in this user’s guide:

Basic Rate Interface (BRI): BRI is the type of ISDN service you will order from the ISDN service provider. A BRI ISDN line has two

B channels and a D channel. The B channels carry data at 56 Kbps or 64 Kbps, and can be used by the applications you use to access the Internet. The D channel is reserved for call setup and signalling.

B channels

ISDN BRI

D channel

Switch: The massive computer that controls your telephone line from the telephone company’s local central office. You must know the type of switch—sometimes referred to as switch configuration—on your line to properly configure the ISDN modem.

Directory number (DN): The actual phone number associated with the ISDN line you order (the directory number is also referred to as the “telephone number” in this user’s guide). Depending on the type of switch on your line, there may be one directory number for both B channels, or one for each B channel.

SPID: The Service Profile ID generally looks like the directory number with some extra digits (the TID) appended to it. The number of SPIDs received with BRI service can vary from none to two.

TID (Terminal ID): This one- or two-digit number is associated with the SPID. It’s usually 1 or 01 for the first SPID and 2 or 02 for the second SPID, but it can vary in form.

If you encounter other unfamiliar terms, check the glossary.