Telos ZephyrExpress - Manual (Page 15)

QUICK RESULTS 1-3
was installed exactly as specified in the ISDN order instructions found at Telos’ web
site and at the end of this manual.
· Have circuit information supplied by the phone company. This must include the
type of switch on the circuit and the telephone number(s) 1 . In the US, it will probably
also include two SPID numbers. In Europe, it may include MSN numbers.
· Have a ZephyrExpress, a microphone, and a pair of stereo headphones or other
audio monitor.
· Understand that these instructions are just to get you started and will not answer all of
your questions or demonstrate all of the features of ZephyrExpress.
· Promise to read the full manual later.
Now, let’s get started.
Gather information about your ISDN line
Analog telephones are simple: all a phone needs to do is tap into a line, and it’ll probably
start working immediately.
ISDN is more complicated. Before any ISDN device can receive or transmit signals, it has
to be matched to central office settings for that particular circuit. These settings include
line identification numbers and a communication protocol.
Your ISDN circuit consists of two digital lines, and both can operate at the same time on a
single copper pair. Each line has an identification number, which may (or may not) be its
telephone number. Sometimes, both lines will use the same identification number.
The phone company’s equipment expects ZephyrExpress — or any other ISDN terminal
equipment — to know the right identification numbers for the circuit it’s connected to,
and to transmit them on demand. If the proper identification numbers aren’t entered
into the equipment, you won’t be able to place or receive calls.
In North America, these numbers take the form of Service Profile Identification (SPID)
numbers: If you’re given SPIDs, they must be programmed into ZephyrExpress.
The two lines also have standard telephone numbers, which users of other ISDN
equipment will dial to call your ZephyrExpress. Unlike regular telephone lines, both lines
may have the same telephone number assigned to them.
European telephone systems don’t use SPID. They may use optional Multiple Subscriber
Numbers (MSNs) to limit which lines will be answered. If you put two MSNs into
ZephyrExpress, the unit will answer calls only on those lines.
Confused? Here are some rules of thumb:
1 There can be one or two standard phone numbers for a US circuit, and may be more
than two for a European one.