Multiple
Low Speed Data Transmission
Problem
You have an earthquake research facility that consists of a main
processing center in the Los Angeles area and dozens of sites scattered
throughout remote areas of the western United States. Each of the
western states is broken down into regions. Each region has a way
station where data is concentrated and sent to the main processing
center. Each way station has multiple data gathering sites from
which to monitor and gather information. How can you efficiently
bring all your data together and send it back to the main processing
center?
Solution
Coastcom's five port SDMs allow you to gather data from multiple
low speed circuits and efficiently multiplex them onto one
transmission channel (DS0). Coastcom's D/I Mux III then takes
the DS0 and multiplexes it onto a T1.
How Does It Work?
Coastcom's five port SDMs combined with the D/I Mux III work
similar to tributaries of a main river. Each port of the SDM
is a small tributary that flows into the D/I Mux III where
it converges with other data onto the T1.
What Actually Occurs?
Andy is a geologist working for a seismic research facility.
He is currently monitoring a remote region in California. The
main processing center is in Los Angeles. Andy collects data
which is sent to the main processing center to be filed, analyzed,
and distributed to Andy's co-workers at other monitoring stations.
Andy has placed motion detectors and seismographs in strategic
locations near the known fault lines. Each detector is connected
to its own fault line. The seismograph records the earth's movement
on paper and also sends it out through the SDM and T1 to Los
Angeles.
When the data arrives in Los Angeles it is sent out through
another SDM to the center's computer system. Other geologists
share the information from Andy's way station and send him data
in return.
How Do You Set It Up?
Set the five subrate channels in the SDM or pSDM for the appropriate
data rates. Set the pSDM for non-polling operation.
What Do You Order?
Both the SDM and the pSDM support up to five circuits of 9.6,
4.8, or 2.4 Kbps data or two at 19.2 Kbps plus one at a lower
speed. SDM and pSDM cards require I/O panels in order to access
the five separate channels. Therefore, if you have five 2.4
Kbps circuits going from one point to another you would need
a SDM card, an I/O panel, and a D/I Mux III at each end.
LAN-WAN-LAN
High Speed Connection
Problem
Your company has Local Area Networks (LANs) in several locations.
It allows memos and documents to be transferred easily between
employees. The corporate office has decided to connect the LANs
together in a Wide Area Network (WAN) using T1.
Solution
Coastcom's SDCU can supply a high speed data link to connect
LANs together.
How Does It Work?
The SDCU sends and receives data rates of 56/64 x N Kbps, where
N is from 1 to 24. The SDCU is programmed to use as many of
the 24 DS0 transmission channels as required. This allow data
rates up to 1.344 Mbps with standard T1 transmission and 1.536
Mbps when B8ZS transmission is used. The communications line
is like a permanent hose connection; the line is always available
for communications between the LANs.
Figure d9. LAN-WAN-LAN High Speed Circuit
What Actually Occurs?
Carol, a proposal writer at the corporate center, needs to know
the profit margin of a portable heater unit in order to offer
a competitive but profitable discount. She requests cost information
from Eric, the manufacturing manager, using the LAN mail system.
Since Eric is at the manufacturing center, the LAN addresses
him through the LAN bridge. The LAN bridge connects to the SDCU.
The SDCU and D/I Mux III then transport her request over T1 to
the manufacturing LAN bridge where Eric receives it over his
LAN mail.
Eric sends a spreadsheet file over the LAN which shows the cost
of parts, labor, and overhead to produce the portable heater
unit. The information is received by Carol in the same manner
she sent the request to Eric.
The LAN bridges are an integral part of the network and neither
Carol nor Eric see any difference between accessing local or
remote information.
How Do You Set It Up?
The SDCUs at each LAN site are set to the same data rate and
communicate over the same DS0 transmission channels.
What Do You Order?
A SDCU is required at each site. Coastcom offers a choice of
56/64 x N Kbps SDCUs with either a V.35 or RS-449/422 interfaces.
A D/I Mux III is required at each site. Coastcom also has more
economical SDCUs that offer 56 Kbps or 64 Kbps data.
Computer
Aided Manufacturing(CAM)
Problem
Your company manufactures complex steel plating for the airline
industry. Your manufacturing facility has a computer controlled
milling machine, which cuts the metal according to a computer program.
The computer programs are created at your engineering center and
then transported to the manufacturing facility on floppy disks.
When design changes occur, the process of transporting computer
programs from the engineering center to the manufacturing facility
slows down production. How can you cut the time and cost of changes
to the manufacturing plan?
Solution
Coastcom's SDCUs can supply a high speed data link to control
and send information to the milling machine computer.
How Does It Work?
The SDCU sends and receives data rates of 56/64 x N Kbps, where
N is from 1 to 24. The SDCU is programmed to use as many of
the 24 DS0 transmission channels as is required. This allows
data rates up to 1.344 Mbps with standard T1 transmission and
1.536 Mbps when B8ZS transmission is used. The communications
line is always available between the engineering center and
the manufacturing computer.
Figure d10. Remote Manufacturing
What Actually Occurs?
Updated drawings have just arrived from the design engineer,
Luke, at Flight Craft. Luke has requested prototype parts so
they can do a physical check on the assembly of a new airplane.
The engineer, Linda, modifies the milling machine computer program
to reflect the latest drawing changes and sends the completed
program to the SDCU's data interface. The SDCU and D/I Mux III
then use time division multiplexing to transport the data on
T1. At the manufacturing facility the SDCU and D/I Mux III demultiplex
the T1 data and send it out to the milling machine computer.
At the manufacturing facility, Hans reads the received program
which requests certain loads of sheet metal be placed on conveyers.
After the sheet metal is loaded, Hans then runs the program.
Robotics, guided by the new program, handle the rest of the milling
process. The requested Flight Craft parts are milled and shipped
out in hours instead of days.
How Do You Set It Up?
The SDCUs at each site are set to the same data rate and communicate
over the same DS0 transmission channels.
What Do You Order?
A SDCU is required at each site. Coastcom offers a choice of
56/64 x N Kbps SDCUs with either a V.35 or RS-449/422 interface.
A D/I Mux III is required at each site. Coastcom also has more
economical SDCUs that offer 56 Kbps or 64 Kbps data.
Data
Concentrator
Problem
You are the communications manager for Pacific Trading, a farm
commodities transportation and storage company. The commodities
are transported by ships, trains, and trucks. You store materials
for various clients at several warehouses. Your clients buy from
each other and often the material is bought and sold while remaining
in your warehouses. Different lots are assigned to buyers as trading
is done. Coordinating shipping for the various lots and dividing
up the lots is a complex and ongoing process. You need instantaneous
inventory control to meet the demands of the market.
Solution
Coastcom's SDCUs can supply high speed data links to the trading
center computer.
Figure 11. High Speed Inventory Communication
How Does It Work?
The SDCU sends and receives data rates of 56 or 64 x N Kbps, where
N is from 1 to 24. The SDCU is programmed to use as many of the
24 DS0 transmission channels as required. This allows data rates
up to 1.344 Mbps with standard T1 transmission and 1.536 Mbps when
B8ZS transmission is used. The communications line is a permanent
connection; the line is always available for communications between
the various sites and the control center. The SDCUs are connected
to inventory terminals at each site. The control center houses
the master computer which keeps track of all inventory.
What Actually Occurs?
One of Pacific Trading's clients, New West Trading, has just
received an order for 200 tons of corn. New West is requesting
the 200 tons be prepared at the Boat Side Warehouse for loading
on a merchant ship. Glenda, the shipping coordinator, accesses
the inventory database on the Pacific Trading Center computer.
The Trading Center computer has three communications ports,
one port to communicate to each warehouse. At each warehouse
an inventory terminal connects to an SDCU. The SDCU and D/I Mux
III then transport the inventory information over T1 to the D/I
Mux III at the Trading Center. An SDCU at the Trading Center
would then pass the information the inventory computer.
From the inventory database, Glenda sees 120 tons of corn at
Boat Side, 300 tons at Train Side, and 170 tons at Truck Side.
She commissions the movement of the materials from the Truck
Side Warehouse.
How Do You Set It Up?
The SDCUs at each site are set to the same data rate as the control
center.
What Do You Order?
A SDCU is required at each site. Coastcom offers a choice of
56/64 x N Kbps SDCUs with either a V.35 or RS-449/422 interfaces.
A D/I Mux III is required at each site. Coastcom also has more
economical SDCUs that offer 56 Kbps or 64 Kbps data.
Fractional
T1 Extension
Problem
You have two T1s coming from the PSN terminating into a Coastcom
D/I Mux III using Dual Channel Bank mode. You are extending a part
of the second T1 over private copper to another building within
the same area.
Solution
Coastcom's TTU plug in channel card can save you the purchase
of a second channel bank at your switching site, while still
offering you the full functionality of T1.
How Does It Work?
The TTU works like a T1 extender. It supports a full T1 or a
fraction thereof. The D/I Mux III is configured to drop the
appropriate number of DS0s to the TTU. Those DS0s are sent
along the TTU's T1 to the remote facility.
Figure 12. Fractional T1 Extension
What Actually Occurs?
Spinco, a manufacturer of compact discs has its main facility
located in an industrial park. Because of expansion, Spinco
has opened a satellite office for its marketing and sales departments.
Spinco already has two T1s coming into the main facility. The
first T1 is fully utilized, but the second T1 has open transmission
channels (DS0s). Spinco wants to run a T1 through the park to
the marketing and sales group for both data transfer and telephone
traffic.
The TTU extends the T1 from the main facility to the remote
facility. The DS0s on the TTU are multiplexed onto the second
T1 and sent out to the PSN. The PSN sees a full T1 while the
T1 is actually fractionalized and split between the main facility
and the remote site.
How Do You Set It Up?
The TTU is set up to accept from 1 to 24 DS0s as needed. In the
D/I Mux III the TTU is programmed to the required number of
DS0s. Set the TTU and the remote D/I Mux III to the same framing
formats and line formats. Set the remote D/I Mux III to loop
timing so that it can obtain clock from the TTU. Set the TTU
to accept clock from the PSN's incoming T1.
What Do You Order?
You will require one TTU and two D/I Mux IIIs for this application.
Drop and
Insert Times Two
Problem
You have a T1 span coming from the PSN terminating into a Coastcom
D/I Mux III in a drop and insert string. The second T1 goes back
out through the PSN to another site with the same configuration.
You need to drop channels out to another remote location.
Solution
Coastcom's TTU plug in channel card can save you the purchase
of a second channel bank at your switching site, while still
offering you the full functionality of T1.
How Does It Work?
The TTU plugs into the shelf like any data channel card. It supports
a full T1 or a fraction thereof. The D/I Mux III is configured
to drop the appropriate number of DS0s to the TTU. The TTU
passes the DS0s over a T1 span. The circuit really works like
a "Y", with T1-1 being the stem and T1-2 and the
TTU fanning from it.
Figure d13. Fractional T1 Extension
What Actually Occurs?
The County Gas and Electric Co. (CG&E) has a drop and
insert network set up between their electrical substations. Each
substation has a Coastcom D/I Mux III. CG&E wants to run
a couple of circuits out to a natural gas storage station to
monitor environmental conditions and to provide a maintenance
telephone.
Karen, the communications director at CG&E, has decided
to pull two circuits off of the D/I Mux III at substation 5A.
The storage station is about a mile from substation 5A.
Karen has decided to use T1 instead of separate lines because
she may need to add circuits to the storage station to accommodate
upgrades at a later date. The TTU allows her to set up another
site without rerouting the current network.
A data and voice circuit coming into T1-1 at substation 5A are
dropped to the TTU. The TTU transports the two circuits over
another T1 span to the storage station. The storage station has
access to and from the main control center over T1-1.
The TTU works only with the D/I Mux III T1 it is assigned to.
In this scenario, T1-1 is talking to the TTU and T1-2 does not
have access. In other words, facilities upstream from substation
5A can communicate with the storage station but facilities downstream
cannot.
How Do You Set It Up?
The TTU can be set up to accept from 1 to 24 DS0s as needed.
In the D/I Mux III mapping functions, map the required number
of DS0s to the channel slot where the TTU will reside. Set
the TTU and the remote D/I Mux III to the same framing formats
and line formats. Set the D/I Mux IIIs to loop timing so they
can recover clock from the incoming T1. Set the TTU to accept
clock from the PSN's incoming T1.
What Do You Order?
You will require one TTU and two D/I Mux IIIs for this application.
|
