ADTRAN Atlas 550 User Manual page 220

Appendix B. OSI Model and Frame Relay Technology Overview
TBOP
B-8
This overview is not intended to be all inclusive of the operation
of a frame relay network. It is intended to help simplify the frame
relay configuration within the ATLAS 550.
Transparent Bit Oriented Protocol (TBOP) is an ADTRAN-proprietary
protocol that is used to transmit HDLC-formatted traffic across the frame
relay network. TBOP allows the transportation of protocols "unknown" to
the ATLAS 550 to be encapsulated in frame relay and sent to a remote
location via frame relay. This protocol can be useful in transporting other
vendors' proprietary protocols across the WAN.
The ATLAS 550 accepts HDLC-formatted data on one of the V.35 or T1 ports
and forwards that data across a frame relay network to another ATLAS or
an ADTRAN frame relay device (for instance, if the ATLAS 550 is
communicating with an IQ product).
ATLAS 550 User Manual 61200305L1-1