Eicon Networks S52 Guia do Utilizador descarregar pdf (Página 68)

X.25 User-Facility Support and Code References

page 66

CUG with Outgoing Access Selection

The index number to the closed user group selected for the virtual call is in the form of two

decimal digits. Each digit is coded in BCD, in a nibble of the parameter field. The high nibble

represents the first digit and the low nibble represents the second digit.

Note: Indices to the same Closed User Group at different DTE/DCE interfaces may be different.

Bilateral CUG Selection

The index number to the bilateral closed user group selected for the virtual call is in the form

of four decimal digits. Each digit is coded in a semi-octet, in BCD. The high and low nibbles

of the first octet of the parameter field represent the first and second digits. The high and low

nibbles of the second octet represent the third and fourth digits, respectively.

Note: Indices to the same Bilateral Closed User group at different DTE/DCE interfaces may be

different.

Reverse Charging

The reverse charging facility is controlled by bit 0 of the octet in the parameter field. If reverse

charging is not requested then bit 0 is set to 0. Otherwise if reverse charging is requested

then bit 0 is set to 1.

*See Fast Select on page 64.

Index (2nd digit)

Index (1st digit)

CUG Selection (Outgoing)

00 110

Code

Octet1

Bit

3 0127 456

Index (2nd digit)

Index (1st digit)

Bilateral CUG Selection

00 110

Code

Octet1

Bit

3 0127 456

Index (4th digit)Index (3rd digit)

Octet2

0 0 0

7 345

100

012

Code

Octet1

Bit

Reverse Charging

RC* 000* 00

Reverse Charging not requested

Reverse Charging requested

Reverse Charging Values

Bit 0 Meaning

1 2 ... 63 64 65 66 67 68 69 70 71 72 73 ... 90 91

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