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The U-1496S+ (aka U-1496+) is ZyXEL's flagship modem.  It is an external modem
with a display consisting of six (6) LED lights and a two (2) line by twenty 
(20) character backlit LCD display.

In addition to the usual features found in U-1496 "Plus" models (ZyXEL-
specific 19.2 kbps speed and 76.8kbps DTE rate) the U-1496S+ has the
following features:
. two (2) or four (4) wire leased line capability
. V.33, V.29, V.27ter protocols
. dial backup capability (calls backup phone number when leased line is 
  unavailable.)
. on-line conditioning monitoring [LCD display shows link option (eg., 
  V.32bis), line speed, error control, data compression, line type (eg., 
  dial-up), data format (eg., asynchronous), instant transmission throughput,
  signal to noise ratio, receiving signal level, phase jitter in received 
  signal, frequency offset, retrains granted, retrains requested, round trip 
  echo delay and carrier loss counts.]
. capability to view the above parameters and the capability to change modem 
  settings via four (4) arrow keys on the front panel.