ADTRAN 1204006L1 Manual do Utilizador descarregar pdf (Página 50)

34 FSU 5622 ESP User Manual 61200.175L1-1

Chapter 4. Applications

Transparent Application

In cases when the user protocol is not supported by the FSU 5622

ESP, 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 FSU 5622 ESP is transparent to the protocol

address formats.

In the transparent BOP protocol, the FSU 5622 ESP 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 FSU 5622 ESP

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 transparent

async mode. The FSU 5622 ESP buffers async characters and

encapsulates the data portion of each character for transport

across frame relay using a programmable DLCI and remote FSU

5622 ESP port number.

See Figure 4-5 and Table 4-D for an example of a transparent

BOP configuration. See Figure 4-6 and Table 4-E for an example

of a transparent asynchronous application.

Router Router

HDLCHDLC

DTE1 DTE1

5622 ESP 5622 ESP

UNI

FRAME RELAY

REMOTE LOCAL

DLCI=17 DLCI=100

DTE2

Figure 4-5

Transparent BOP Application

1 2 ... 45 46 47 48 49 50 51 52 53 54 55 ... 174 175

Sem comentários

ADTRAN 1204006L1 Manual do Utilizador Página 50