NEC PowerMate V486 Series Manual page 243

Protocols:
Bell 212A (1200 bps) and 103 (300 bps)
CCITT V.22bis (2400 bps) and V.22 (1200 bps)
CCITT V.32bis (14,400 bps) and V.32 (9600 bps)
CCITT V.42 and MNP 2-4 error correction
V.42bis and MNP 5 data compression
Group 3 facsimile modes
V.17 (14,400 bps) transmit and receive
V.29 (9600/7200 bps) transmit
V.27ter (4800/2400 bps) transmit and receive
V.21 Channel 2 (300 bps) transmit and receive
Automatic dialing and answering; touch-tone transmit and
receive
Autobaud operation
Non-volatile memory storage for two user profiles and four
telephone numbers
Four COM ports and four interrupts
40-character command buffer for chaining commands
Auto-negotiation of highest mutually supported level of
error correction, data compression, and modem speed
Automatic speed selection/automatic fallback to slower
speed on initial connection and during call
Communications software compatible command sets (AT
commands and S registers)
Automatic terminal-to-modem speed sensing up 57,600 bps
Inactivity timer (when set, hangs up if no data in
programmable time from 1 to 42 minutes)
Dual RJ-11 telephone jacks — one for the telephone line,
one for an optional phone
Buffered 16550 UART
B-8 Specifications