TANDBERG D11624 - Manual (Page 15)

Tandberg Video on Frame Relay
D11624 rev.01 15
11.2 Standard EIA-449/RS449 Cables
11.2.1 Network Cable
11.2.2 User Cable
A note about RTS signalling:
Some manufacturers state that
their network interface is RS449
(which uses RS422 signalling
levels) but actually use RS423
signals for the control leads. If this
is the case, then check the position
of the RTS straps on page 11.