GTE Omni Si Database Technical Practices Issue 1 Manual

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Digital Featurephone
voice f---)non-voice
control 
& data
control & dataL
Figure 5.8Digital Featurephone Data Packet Flow
DVCIP
IMPRTf3 voice
pt+iL non-voice
Mini-Packet
5.7 The following are characteristics of MPP (Mini-Packet
ProtocolProtocol) (see Figure 5.9).
Characteristicsl Link runs at 256 Kbps, ping pong (ping pong = once bus
seizure is established, link runs at 128 Kbps in each direction).
* Each mini-packet consists of:
- Sync Flag (l/2 byte)
- Header(2 byte-9
- Data(8 bytes)- CRC(1 byte)l The first bit of first header byte determines whether the current
mini-packet is voice or non-voice.
- 1 = voice
- 0 = non-voice
SYNC
header
f--- data field -CRC
IFigure 5.9 Mini-Packet
l Channels available.
- 64 KbpsVoice
- 19.2 Kbps Data
- 4 KbpsControl
- 40.8 Kbps Overhead and Guardband
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TL-130500-1001
PD-200 DATA OPTION6.0 In addition to the voice features available with the OMNIOVERVIEWPABX, the PD-200 Data System (Figure 6.1) provides:
0 Separate data and voice switching
- Voice traffic uses circuit switching.
- Data traffic uses packet switching.
0 ASCII (American National Standard Code for Information
Interchange) asynchronous data at speeds up to 19.2, Kbps
(Kilobytes per second).
l 
CCITT (Consultative Committee on International Telegraphy
and Telephony) X.25 synchronous data at speeds up to 64
kbps.
Personal Computers
Voice-Data
Work Station
Terminals
Word Processors
Key Systems
Printers
Telephones
Featurephones
r
8Figure 6.1 
OMNI PD-2C
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l Public Telephone
Network
o Private Telephone
Network
l Public Data Network
* l Private Data Network
l Other Common
Carriers
l Other 
PABXs, ETC.
Data System6.1 (Figure 6.1) With the PD-200 Packet Data System option,
Overviewthe voice and data systems are combined within the PABX. The
voice and data systems share:
l Cabinet (they are both housed in the same physical location)
l Power source
* Single pair from the DFP/APMs to the FB-17246-A card
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l Mass storage system of the hard and floppy disk- Access from the data system to the hard disk is via the SASI(Shugart Associates Standard interface) bus (Figure 6.2).
- The hard disk accesses the generic programs and the data
base.
VOICE
ElCEC BUSF’LE SWITCH+ ’ ’ ’ ’ ’ ’ . ’ -b y!s;;;;Ayl
FB-17220-BOAI 1
I I; 1iI 1
ADMINISTRATIVE ’SAYII 1II IANDASSEMBLY EC-22199-ABUSII L --______________ - MAINTENANCEL------_--_-___-__-_PROCESSOR:______________________________PEC BUS
(ADMP-C)
LPBFB-17230-BOA
Figure 6.2Data System Access to Mass Storage
S-106
System Buses6.1.1 The voice and data hardware use separate buses for the
switching of signals; this is referred to as dual bus architecture.
Through dual bus architecture, voice and data signals are always
separate and have no effect on one another. Buses that are
responsible for voice transfer and switch interaction are:
l PCM (Pulse Code Modulation) bus
0 PEC (Peripheral Equipment Complex) bus
The bus used by the data system for the transfer of data packets
is the LPB (Local Packet Bus).
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Data Components6.1.2 Components of the data system that are separate from the
voice switch include:l 
Netlink processor for control of data and call setup or
takedown
l Administrative processors that maintain and administer the
data switch featuresl Facilities processor that performs call processing functions
and interfaces with the PEC bus.Advanced data features provided by the data system include:
l Packetization of data and control information for transferthrough the system
l Speed and protocol conversion
l CCITT X.25, X.3, X.28, and X.29 signaling based standards
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							TL-130500-1001Administration6.2 Data system administration functions are given as an
extension of the existing voice system. The facilities that provide
the administration functions are based separately. Access to
these functions, which include Recent Change, maintenance,
accounting, diagnostics, and event reporting, is through the voice
switch maintenance console and a data maintenance console,
that interfaces the system via the ADMP (Administrative
Maintenance Processor) (Figure 6.3).
S-108NOTE: A separate console for
d-ata is required.
PEC
BUS
Local
Packet
BUS
PCM
BUS
Figure 6.3 ADMP Terminal
NOTE: The ADMP is a two-card set: the maintenance terminal
connects to the A card. Any terminal used with the data system
must be VT 
> 101 compatible.
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Data Transport
6.3 Data switching that does not affect voice capacity is possible
because of the PTS (Packet Transport System). A new bus
structure, called the LPB (Local Packet Bus), has been added to
the backplane. The LPB is only for data transfer (Figure 6.4).
Self-routing entities, called mini-packets, perform
communication within the packet transport system (see
paragraph 6.4). Each device communicates with the switch by
means of the PTS (Packet Transport System), and is assigned its
own PLA (Packet Line Address).PCMUS GROUP CGRgUPIUP 4 -z
;-
:
-
-2
0
-
:mP
c
:
-
EXP;~~‘“”
W)
STEZED
(Y)
--+ GRtUP -
PCMUS GROUP C
FILE B
:;
I
t(
+-COMMON CONTROL
LOCAL PACKET 0 ->Figure 6.4
Possible Local Packet Bus Configuration
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							TL-130500-1001Packet Line Address6.3.1 This paragraph describes the PLA (Packet Line Address).
l The PLA gives the internal address of the component to which
it is assigned:
- This assignment is performed automatically by the data
system.
- The assignment is based on the hardware configuration of
the system.
l The PLA has no relationship to the subscriber line number that
the user sees.
l The PLA is made up of 14 bits of address information.
Devices that communicate over the PTS use a FGBS proprietary
or internal protocol, known as MPP (Mini-Packet Protocol), to
ensure error-free communication. CRC (Cyclical Redundant
Checking) performs error detection.
NOTE: A proprietary protocol is one that need not comply to any
CCITT recommendations because it is internal to the PABX.
Local Packet6.4 The following major components connect to the
Bus interfacesLPB (Local Packet Bus ) and require a PLA (Packet Line
Address).
NOTE: Cards that transport data packets are described later in
this document.
l 
UCB/DCP (Universal Controller Board) requires one PLA. This
card provides the processing power needed to supply the
features of the Digital Featurephone and the data system, such
as call setupitakedown.
l ADMP (Administration and Maintenance Processor) requires
one PLA. This card provides administrative and loading
functions.
l 
NIC requires one PLA. This card provides a network interface.
l VPLC (Voice Packet Line Card) requires one PLA for each
circuit activated (8 maximum).
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The VPLC (card type VPLO and VPLl) connects remote
processing devices to the PABX. These devices are:
l APM (Asynchronous Packet Manager) which connects to
asynchronous devices that operate at lower speeds
l SPM (Synchronous Packet Manager) which connects to
synchronous devices that usually operate at a higher speed
(9.6-64 Kbps.)
l DFP/APM (Digital Featurephone with APM) which connects to
asynchronous devices that usually operate at a higher speed
The VPLC2 (card type 
VP20) connects remote processing
devices to the PABX. These devices are:
l APM which connects to asynchronous devices that 
opera:? at
lower speeds
l SPM which connects to lower speed (up to 19.2 Kbps.)
synchronous devices
l DFP/APM which connects to asynchronous devices that
operate at lower speeds
The VPLC2 (card type VP21) connects remote processing
devices to the PABX. This device is:
0 SPM which connects to higher speed (9.6-64 Kbps)
synchronous devices
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SPMSPM 
j
Figure 6.5,Remote ProcessorNPLC (Voice Packet Line Card) Connection
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. .
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