GTE Omni Si Database Technical Practices Issue 1 Manual

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							TL-130500-1001* System Generic Disk
l System Data Base Disk
0 Options Disk I, Overlay Programs/MDR
0 Options Disk Ill, Diagnostic
l Options Disk IV, Data Switch Generic
l Options Disk V, Data Switch Generic
NOTE: File contents of disks are subject to change due to new
SVRs and/or customer alterations.
ADMP-C accesses the system hard disk via the 
SASI (Shugart
Associates Standard Interface) bus and the FMS (File
Management System) card.
Hard
Disk Drive
FMSD card
FB-1 722O-BOA
PBEITII
I >A,NIC1I1
1 -/
Floppy(connects to
Disk DriveDDC card)LPB
Bus
PCM
Bus
Figure 8.1FMSD Interface
NOTE: The FMSD card is interfaced to the PD-200 Data
System ADMP-C card via the DDC (Disk Drive Controler) that is
attached to the hard disk.
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							TL-130500-1001File Management8.2.2 With the data option, the FMSD provides an
System Datainterface for the voice system, microprocessor, and disk drive
controller as well as the data system (see Figure 8.2, 8.3). This
interface is through the ADMP via the 
SASI (Shugart Associates
Standard Interface) bus. The 
SASI bus is a ribbon cable.
DFP/VPLC-2
El--APM
LOCAL PACKET BUSFILE MANAGEMENT SYSTEM CARD DATA
MAINTENANCE
l-w
.
------DATArI
I
IIL---------J
BUS (See Note)
. . . . . . . . . . . . . . . . 
.;
---------------~DATAI
nTERMINALI
I
I
(LED0.8 MB
FLOPPY DISK
DISK DRIVE
CONTROLLER
WC)
-EW-1:O MBHARD DISK
NOTE:SHUGART ASSOCIATES
ISYSTEM INTERFACE
UNIVERSAL CONTROL BOARD (UCB)I
I
L--~-~-~~~~~~~~~~~~-----~--~J
Figure 8.2Simplified Disk System Interface
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							TL-130500-1001j_____----_--_____---------------ICEC BUS
4.. . . . . . . .DISK DRIVESYSTEM DATA
I 1
FD-1061-BPI 1
I 1
I 1
I 1ADMINISTRATIVESASI ’II 1ANDASSEMBLY EC-221 99-AIIL ------ ----__- --__BUS )
I
L-------------------MAINTENANCE:____-_______--_---_------------~PEC BUSPROCESSOR
(ADMP-C)
LPBFB-17230-BOAI
-.^ ^ -__--. . .. - . .
S-l 26tlgure 8.3FMSD and Hard Disk Assembly Interface
File Management
System Data8.2.3 The file management system’s files are described in full
Commandsin paragraph 4.9.3. FMS commands that are used only for the
data option are as follows:
l Administration and Maintenance Command Descriptions:
- Format Command. The Format command can initialize a
blank disk for use by the FMS.
- Reset Command. The Reset command requests FMS to
close all open files and release all 
FlDs which this port
(system or ADMP) has opened and seized.
Devices which
the port has dismounted are mounted, and devices marked
private are marked public.
- Diagnostic Command. The Diagnostic command can check
the integrity of the FMS and associated hardware.
- Configuration Command. The Configuration command
allows the user to determine what devices are attached to
FMS.
- Time Command. The Time command allows the system or
the ADMP to set the 
FMS’s internal clock, which is used to
time stamp file accesses.
- Mount Command. The Mount command is used to allow
access to a device. As a subcommand, Mount marks a
device as public or private. Devices marked as private will
only allow access from the processor which mounted the
disk. After the Mount command is issued for a device, FMS
will allow files to be opened on that device.
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							TL-130500-1001- Dismount Command. The Dismount command is used to
prevent access to a device. After the Dismount command is
issued for a device, FMS will not allow files to be opened on
that device. As a subcommand, the device can be marked
or retained as a private device, preventing the other
processor from mounting the device. Before removing a
floppy disk, this command should be used to lock out
unwanted access to the disk. Removing a disk on which
files are open can result in a loss of data.
SASI Bus8.2.4 The SASI bus passes blocks of data between the ADMP
and the FMSD. The 
SASI bus connects the FMSD to the DDC.
Refer to Figure 8.4. The ADMP connects to the middle of the
SASI bus cable between the FMSD and the DDC (via a mass-terminated 50-pin connector). The 
SASI bus allows for the
following:
l Processor-to-processor data transfers
l Arbitration for 
SASI bus control
l Host-to-controller communications
l ADMP emulates host for disk control (Future)
0 ADMP passes data to/from FMSD.
l ADMP requests disk data transfers via processor-processor
functions.
The 
SASI bus contains the following signals:
. DO-D7 =bidirectional data bus
- transfer of eight-bit data between master and slave
- addressing slave during selection
. RESET =reset slaves, not used for ADMP
l SEL = active indicates address of slave on data bus
l BUSY = acknowledgment of select
. REQ =slave ready to transfer or receive data
. ACK =handshake for byte transfers
l (C/D) = Command/Data signal from slave as to type of transfer
(not used for 
FMSD/ADMP interface)
l MSG = message, indicates type of bus transfer (not used for
FMSD/ADMP interface)
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							ADMP
IIFMSD
Figure 8.4Disk System Cabling
Voice and Data8.3 This paragraph describes the transfer of voice and data.
Transfer
Complex Low -Level8.3.1 The VPLC, VPLC2, UCB, PR and ADMP-A 
PCBs
Buscommunicate with the voice system processor over the PEC
low-level bus. The low-level bus is separate from the PCM
bus. The low-level bus communicates with and controls the
cards that are installed in the 
PCMUSs (PCM Universal Slots).
The processor reads from, and writes to, the cards on the bus by
accessing a section of the address space that is mapped to the
ports of the cards. The bus control logic translates the access
into a card select signal, a port address, and a read/write signal
on the bus. It then transmits a byte of data to, or receives a byte
of data from, the designated card bus port. Cards such as the
PR (Packet Router) and the VPLC (Voice Packet Line Card) are
supplied with a register, and cards such as the UCB (Universal
Controller Board) card and the ADMP (Administrative and
Maintenance Processor) card are supplied with a 
first-in/first-out interface to the PEC low-level bus. This interface allows
them to exchange information with the system.
NOTE: Only the VPLC2 and NIC data cards electrically connect
to the PCM bus.
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							TL-130500-1001Voice Switch Pulse8.3.2 The voice switch network provides the ability to connect
Code Modulationany two (or more) voice ports (lines or trunks). Communication
Networkthrough the network is based upon time-division multiplexing of
PCM-encoded samples. The voice signals convert from analog
to PCM at the line/trunk card. However, in the Digital
Featurephone, the voice signal is converted to PCM in the
telephone and passed in the form of mini-packets to the VPLC
(Voice Packet Line Card,) where it is de-packetized. A card
select and port select signal is sent from the network control
logic to the VPLC to gate a PCM sample onto the 24-channel
file PCM bus. The file buses combine into a 96-channel bus
that is fed into the 192-connection time-slot interchange switch.
The time switch transfers the sample to the appropriate outgoing
time slot, and the sample follows the reverse path to the
terminating port.
Packet Transport8.4 The packet transport system hardware (Figure 8.5) switches
Systemmini-packets between the various devices connected to it. All
control and user information exchanged within the data system
uses the packet transport system. Mini-packets are 
self-routing, fixed-length entities, which contain addressing
information 
lpacket line addresses), user data, and error-detection information. Two versions of mini-packets are used.
Internal mini-packets are those that are transmitted within the
central switch itself. External mini-packets are those that are
transmitted across a local access medium (such as a pair of
wires) to/from a remote processor. The conversion between
internal/external formats is performed in the voice packet line
cards which provide access to the local access medium.
Mini-packets are assigned access to the switching and
transmission hardware upon demand and are transported over
the LPB.
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							TL-130500-1001Figure 8.5Transportation of Mini-Packets over LPI3IS-l 30Local Packet Bus8.5 The LPB (Local Packet Bus) consists of eight leads and is
essentially two separate buses. The first is a two-bit-wide data
bus. The second, a two-bit-wide time-division-multiplexed
bus, transfers packets and encodes busy status indications.
Both buses operate off the same 
1.544-MHz clock, and both
use the same frame synchronization line to maintain the link.
Any hardware which connects to the LPB for communication is
referred to as a packet line interface. Each packet line interface
uses 1 of the 504 packet line addresses on the local packet bus.
In addition to providing a full-duplex data transmission facility
capable of receiving 12,000 incoming (toward the packet router
enhancer) and sending 12,000 outgoing (from the packet router
enhancer) mini-packets per second, the local packet bus
provides for the real-time exchange of the status information of
each packet line interface.
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