GTE Omni Si Database Technical Practices Issue 1 Manual

TL-130500-1001
PD-200
9.0 Described in this paragraph are the basic operating
BASIC OPERATING
principles of the packet transport system used to support the
PRINCIPLES
data system and the Digital Featurephone.
Call Path Concepts
9.1 Simultaneous independent paths (logical links) can be
established between various devices within the data system.
This lets a single card simultaneously communicate with several
other cards in the system by multiplexing transmission across the
packet transport system. For a...

TL-130500-1001PD-200 Data System9.2 The PD-200 Data System functions as an independent data
switch within the system.It provides interconnections among
asynchronous DTE (Data Terminal Equipment), DCE (Data
Communication Equipment), and packet mode X.25 
DTEs. The
data system also supports interfaces to X.25 
PDNs (Public Data
Networks). All data devices not collocated with the switch
connect directly to interface circuitry that allows the device to
transmit data over a single pair of wires. Asynchronous...

TL-130500-1001Data Interfaces9.3 The PD-200 Data System supports the following data
devices:
l ASCII asynchronous data terminals at speeds up to 19.2 Kbps
l Host computers emulating asynchronous data terminals at
speeds up to 19.2 Kbps
l A limited set of full-duplex modems (private line, 
auto-answer, and auto-dialer) providing an asynchronous, serial,
ASCII, single-speed interface
l X.25 
DTEs at speeds up to 64 Kbps with HDLC framing
l X.25 
PDNs at speeds up to 64 Kbps with HDLC framing
Signaling9.4...

TL-130500-10010 A connected message is displayed on the originating terminal
when the connection has been made. (This message is
suppressed if X.3 parameter 6 is set to a zero.)
l The call indicator on the originating APM will be lit.
Call Disconnect9.6 Either party can disconnect a data call. Asynchronous
devices disconnect a data call by dropping 
DTRDSR, or by
escaping to the network command mode and entering the
disconnect command on the keyboard. (This option is not
allowed if X.3 parameter 1 is set...

TL-130500-1001Data Device9.8 This paragraph describes addressing for data devices.
Addressing
Numbering Plan9.8.1 To plan a data numbering scheme, the system users must
first be grouped in the following categories.
l A rotary hunt group (89 users maximum) 
- asynchronous
l 89 individual users (maximum) of the non-rotary hunt group 
-asynchronous
l 1 pair of primary/secondary X.25 lines 
- synchronous
l 1 pair of load-sharing X.25 lines 
- synchronous
l 1 single X.25 line 
- synchronous
. 1 ADMP
Each...

TL-130500-1001Data Network9.8.3 In the United States, the DNlCs are assigned to a network
Identification CodesNI = Network Identifier digit by the Federal Communications
Commission. The GTE-Telenet Public Network has been
assigned 
DNIC 3110 (see Figure 9.2). Some currently assigned
DNIC codes are as follows:
DNICNETWORKCOUNTRY
3110Telenet
3106Tymnet
2341IPSS
2080NTI
2081TranspacUSA
USA
England
France
France
In the PD-200 Data System, it is suggested that 
DNIC 3110 be
used in the X.121 address. For...

TL-130500-1001Server Number9.8.4 The server number (Figure 9.3) is an eight-digit number
which identifies an X.25 host, terminal, or network. A server
number may also identify a collection of asynchronous
lines/devices that are grouped into a set. The lines/devices in
this set can either be accessed individually or as a group. A
main pilot number provides access to a rotary hunt group. One
set may contain a maximum of 89 terminals in the PD-200 Data
System.
i3110j20200100; xx jIIIII1
i DDCNI i+-SERVER-i...

TL-130500-1001
terminal. If a port number has been specified, then it will be
used; otherwise, the port number will be set to zero.
Sub-addresses 90-99 are reserved for internal administrative
functions. The ADMP uses an address which must have a
unique server number and its support number must be 00. No
other restrictions are imposed on the number of digits or the
values of the digits comprising the address.Routing9.9 All routing of X.25 data packets is based upon the virtual
circuit concept. When a...

TJ -130500-l 001
i31 10i2020010o/01;
13110120200100;02;
13110;20200100;03;II1IIj  DDC
NI i-SERVER-i SUB iI
DNIC !NUMBERI PORT;I
I
Figure 9.5Rotary Hunt Group ExampleNOTE: Example of a rotary hunt group with 3 members (89
maximum).
/  
i3 1 1 0 i2 02 0 0 1OO~Ol~lI  
:IIIIi I/  ;  
D”DcN,CN’ j-SERVER-i SUB 1
INUMBER
II; PORT ]IIIIII1III
II
Figure 9.6EAample of Rotary Hunt Group Numbering
Plan
iNOTE: This example represents a rotary hunt group access to a
group of printers. Any 
DFP/APM can access the group...

 rTL-130500-1001
HOST COMPUTERrlyult: a0Luau 31 lcll II ly cAclIIIfJlt:NOTE: The 
APMs are able to access the host computer via the
SPMs. This application provides an automatic back-up
connection should one of the links fail. It is recommended to put
load sharing 
SPMs on different VPLCs.
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