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User Facility Support 192

Network User Identification (NUI): C6, NUIlength,NUI

The first parameter after the Facility code specifies the length in bytes of the

NUI. This is followed by the NUI itself in a format determined by the network

administration. The following shows how to encode the seven-character NUI

pass.id.

C6,07,“pass.id”

Flow Control Negotiation (packet size):42,insize,outsize

Insize and outsize specify, respectively, the maximum length of incoming and

outgoing packets. They are coded as the logarithm base 2 of the packet size,

and may be offered by networks in the range of 4 through 12. That is, packet

sizes from 16 through 4096 bytes. All networks must offer packet size 7 (128

bytes).

User Facility Request Codes

Certain Facilities may be specified on the PAD call request (CALL) command

line. These same Facility Codes may also appear as a part of PAD Service

Signals such as CLEAR and LISTENING.

Code Facility

C Charging information

E Address Extension String Called Address Extension

F Fast select with no restriction on response

G CUG string Closed User group

N NUI string Network User Identification

O CUG string Closed User Group with outgoing access

Q Fast select with restriction on response

R Reverse charging

T RPO string RPO transit network selection

P Puts a Datapac Priority Traffic Indicator at the beginning of the

Facility field. This is not a standard CCITT facility.

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Eicon Networks C21 Guida di Installazione Pagina 192