Date Code 20010518 Appendix B B-1
SEL-2020 Instruction Manual
APPENDIX B: OPTIONAL INTERNAL MODEM INFORMATION
DESCRIPTION
The SEL-2020 optional internal modem contains all of the circuitry required for complete
modem operation, allowing direct connection to the Public Switched Telephone Network
(PSTN). This modem complies with CCITT V.21 (International 300 baud), V.22 (International
1200 baud), V.22bis (2400 baud), V.32 (9600 baud), V.32bis (14400 baud), V.34 (33600 baud)
and Bell 103 (North American 300 baud) and 212A (North American 1200 baud) protocols. The
modem is "AT" command set compatible.
FCC COMPLIANCE
The SEL-2020 optional internal modem complies with Part 68 of the FCC Rules and
Regulations. The SEL-2020 has a label which contains the FCC Registration Number and
Ringer Equivalence Number (REN) of the modem. You must, upon request, provide this
information to your telephone company.
The REN is useful to determine the quantity of devices you may connect to a telephone line and
still have all of these devices ring when the number is called. In most areas, the sum of the RENs
of all devices connected to one line should not exceed five. To determine the number of devices
you may connect to the line, contact your local telephone company to find the maximum REN for
your calling area.
If your system causes harm to the telephone network, the telephone company may discontinue
service temporarily. If possible, they will notify you in advance. If advance notification is not
practical, you will be notified as soon as possible.
Your telephone company may make changes in its facilities, equipment, operations, or
procedures that could affect proper functioning of your equipment. If they do, they should notify
you in advance to give you an opportunity to maintain uninterrupted telephone service.
You may not under any circumstances attempt any service, adjustments, or repairs on the
modem. It must be returned to the factory for any such work.
MODEM IDENTIFICATION
To determine the SEL-2020 internal modem part number, refer to the modem identification
sticker located on the SEL-2020 rear panel. Tables B.1 - B.4 illustrate the command set
information for the different modem types.
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