NIO CommKit Host Interface Installation and System Administration Manual

3-5
Control Tables (from AT&T 255-110-127)
Data Switch Dialstrings
and 3 if the local host is to send both INTREQ and INIT1).
• Recbuf - the logarithmic (base 2) value of the call originator’s receive buffer size.
• User-dialstring - the information provided by the caller on the local host in the
original dialstring (such as location, service, protocol, and parameter informa-
tion).
• User-ID - a sequence of characters which the data switch node extracts from the
call setup message. The User-ID convention is as follows. If the first character
is 0, it represents an octal user ID. If it is entirely numeric, it represents a decimal
user ID. Otherwise, it is interpreted as a character login.
• Origin - the data switch node group name of the originator as known to the remote
data switch node.
• Node - the name of the remote data switch node.
• Mod - the module number of the call originator in character decimal format.
• Ochan - the backplane channel number of the call originator on the module indi-
cated by Mod.
• Cflag - the call flag (F if this is the first call from a port with a predefined desti-
nation and P if this is the second or succeeding call to this host from the same host
with no drop in the incoming DTR/CARRIER lead).
•[.Par1.Par2...] - reserved for nonpositional parameters. The current implemen-
tation supports only a baud rate field which identifies the baud rate of the incom-
ing call (BD=xxxxx).
• Module Type Information - the hardware module type and service type of the call
originator. It is intended to be used internally by the network.
This discussion will address the User-dialstring portion of the dialstring.
NOTE: The Chan, Token, Lflag, URPinit, Origin, Node, Mod, Ochan, and Cflag values are
supplied by the data switch node and are not discussed here.
The format of the User-dialstring portion of the dialstring is:
location.service.protocol.parameter
Although the specific dialstring can vary, the format of the User-dialstring
follows these general rules:
• The location is of the form area/exchange/host where area is the name of the area
code in which the data switch node resides, exchange is the name of the exchange
in which the data switch node resides, and host is the name of the local service