GTE Omni Si Database Technical Practices Issue 1 Manual

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REMOTE DATA30.0 Remote Processors (RPs) such as the APMsPROCESSORS(Asynchronous Packet Managers), 
DFPIAPM (Digital
SYSTEMFeaturephone with Asynchronous Packet Manager), and 
SPMsCONNECTIONS(Synchronous Packet Managers) are normally connected as
shown in Figure 30.1.
The asynchronous and synchronous processor (APM, 
DFPIAPM,SPM) can be located remotely to reduce traffic within the system.
The remote processors eliminate the need for in-house
processors.
MPP
I==
I
I IVOICE , VOICE ,
PACKET...

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s-294a/a7SW 5210 

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APM (ASYNCHRONOUS31.0 The microprocessor controlled APM (Figure 31 .l) pcovidesPACKET MANAGER)the interface between the asynchronous data equipment
EC-221 79-A(terminals, personal computers, etc.) and the VPLC (FB-17226)
card or VPLC2 (FB-17426) card. Each APM connects to one
asynchronous data device.
SVR 5210TEST
\,
FRONT VIEWS
REAR VIEWI
II\II
LINEDATA1’1 ’RESET
OUT
/
IN
DCEDTE
IFigure 31.1APM
887 

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The APM Assembly EC-22179-A0 Is used for devices that require an asynchronous W-232-C
type interface
l Supports devices that operate at speeds up to 19.2 Kbps
The VPLC (FB-17226) that is used to support an APM is
configured as a type VPLC 0 in data base, allowing all 8 ports of
the card to be used (see Figure 31.2).
NOTE: The VPLC2 (FB-17246) card, when configured as a type
VP20 card in data base, can support 
APMs, DFP/APMs, and
DFPs.Figure 31.2 APM Connection
I ADMP-A
FB-17229LPB...

SVR 5210TL-130500-1001
The APM, designed for desk-top installation, is housed in a
small plastic case. A telephone can be put on top of the APM;
cable connections are at the back of the APM. Each APM
communicates with the system over a single twisted wire pair.
This connection provides for continuous two-way transfer of
data only (no voice). Using 26 gauge wire, the maximum
distance from the APM to the system is 3000 feet. The maximum
distance from the APM to the terminal equipment is 50 feet. The...

TL-130500-I 001- maximum
distance
RS-232-C
maximum
distance
*- 3000’mini-
packets
m
VPLC -
Figure 31.3
Transport of Mini-Packets
S-298
8187The protocol that governs the function of the PAD is X.3. The X.3
protocol provides a set of values or parameters that characterize
the operations of the terminal that is paired with the APM.
X.3 Parameters31.1 The X.3 parameters define the following basic functions of
the data terminal:
Q Packet Forwarding
? Break Handling
8 Flow Control
@ Device Specific...

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digital bit stream
APM
packetizing
datadata packets
CRC
address
(control)
(control “to”)rrgure 31.4ivmwacKeT: rrotocoIThere are eighteen standard X.3 parameters. The 
OMNIrequires an additional seven non-standard parameters, which
are referred to as local parameters. The X.3 parameters are
defined as follows:
Parameter 1 
- Escape from Data Transfer
Parameter 2 
- Echo
Parameter 3 
- Selection of Data Forwarding Signal
Parameter 3 
- Selection of Idle Timer Delay
Parameter 5 
- Ancillary...

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Parameter 11 - Binary Speed
Parameter 
42 - Flow Control of the Pad by the Start-Stop Mode
DTE (Data Terminal Equipment)
Parameter 15 
- Editing
Parameter 46 
- Character Delete
Parameter 17 
- Line Delete
Parameter 18 
- Line Display
Local Parameters31.2 In addition to the eighteen X.3 parameters the system
operates under seven local parameters
@ 0 - Escape to Local Parameters
e 1 - Profile ID (Terminal ID)
@ 2 - Eight Bit Transparency
@ 3 - Parity
@ 4 - Full Duplex
@ 5 - Interval Timer
0...

Tt-130500-I 001SPM (Synchronous32.0 The microprocessor-controlled SPM (Figure 32.1)
provides
Packet Manager)the interface between the synchronous X.25 data equipment
(EC-221 78-A/B)(Public Data Network, Host Computer, etc.) and the VPLC FB-17226 card or the VPLC2 FB-17246 card. Each SPM connects
to one synchronous X.25 data device.
SVR 5210FRONT VIEW
GTEX.25 TESTSWITCHX.25
ACTIVELINKLINK
REAR VIEW
-*“-t-------~~LINEDATA
r-7OUT
I
!N
DCEDTEI
Figure 32.1SPM (Synchronous Packet Manager)
8i87s-301 

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Two versions of the SPM are available:
l Assembly EC-22178-A (Figure 32.1)- Required by devices that use an RS-232-C/V.24 type
interface.
- This assembly supports devices that operate at speeds up
to 19.2 Kbps.
- The VPLC (FB-17226) used to support the EC-22178-A,
is configured as VPLO in data base allowing all 8 ports of the
card to be used.
NOTE: The VPLC2 FB-17246 card, when configured as a VP20
card in data base, can support low-speed 
SPMs as well as
DFP/APMs and APMs.l Assembly...