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Chapter 5. Applications

5-4 Express 5210 User Manual 61200208L1-1

Transparent Application

In cases when the user protocol is not supported by the

Express 5210, the transparent mode may be used. Transparent bit-

oriented protocol (BOP) or transparent asynchronous protocol may

be selected. This can be used for point-to-point connections only

because the Express 5210 is transparent to the protocol address

formats.

In the

RANSPARENT

BOP

protocol, the Express 5210 accepts an

HDLC-like protocol and encapsulates the information field of the

HDLC frames, transporting them across the frame relay network to

the specified virtual circuit and remote Express 5210 port number.

The incoming frames must be spaced with at least one flag byte

(0x7E) and contain two bytes of CRC16 at the end of each frame.

Asynchronous protocols are supported by using the

RANSPARENT

SYNC

mode. The Express 5210 buffers async characters and

encapsulates the data portion of each character for transport across

frame relay using a programmable DLCI and remote Express 5210

port number.

See Figure 5-2 and Table 5-2 for an example of a transparent BOP

configuration. See Figure 5-3 and Table 5-3 for an example of a

transparent asynchronous application.

Figure 5-2. Transparent BOP Application

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ADTRAN 1204006L1 Manual de usuario Pagina 62