Oki BV1250, Руководство по установке

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Oki BV1250 Installation Guide APPENDICES
Revision 1.0 Page 261 of 334
Appendix A:
Glossary Glossary Glossary Glossary
10BASE-T
10BASE-T is a LAN transmission line specification stipulated in 1990
by IEEE. Transmission speed is 10 Mbps and the modulation
technique is base-band modulation. The cable uses unshielded twisted
pair, similar to a telephone wire.
A-law
The PCM coding and compression standard used in Europe and in
areas outside of North America influence. A Law Encoding is the
method of encoding sampled audio waveforms used in 2.048Mbps, 30
channel PCM primary system known as E-carrier.
AGC
Automatic Gain Control is a feature of the BV1250 unit that allows
the unit to automatically adjust the incoming voice signal to a user
defined level in dBm.
AP/FXS board
A board that supports an analog subscriber line interface (FXS). When
installed in the BV1250 base unit the APIF board performs the
following functions:
•
Power feeding to terminal
•
Over-voltage protection
•
Reception of selection signal
•
On-hook/Off-hook monitoring
•
Analog-to-digital conversion of voice signal
•
Reverse current function
Audible signal tones
Audible signal tones are identification tones used to control the
connection process or provide status to telephone calling and called
parties. The tones include dial tone (DT), busy tone (BT), ring-back
tone (RBT), special dial tone (SDT), connection restriction tone
(RDT), howler tone (HWT), and ring (RI).