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					                                     Telkom SA
                                     Wall of Excellence

With its one hundred and twenty      Formed out of the need to have a more centralized
                                     control of its operations, the all-new Telkom National
meter wide wall Telkom has a         Network Operations Centre (NNOC) at Centurion
                                     Techno Park is an impressive place. The new Centre
bird’s eye-view of the network,      allows the company to manage and monitor the core
                                     international and national network from one
twenty-four hours a day, seven       centralized control point, for the first time.
days a week. For a long time the     It provides real-time contact with all of Telkom’s
                                     exchanges and network transport elements, such as
NNOC wall is going to be the
                                     ATM and SDH. This means that they can detect and
reference     point   for   Barco    correct network problems proactively, greatly speeding
                                     up response times and service.
worldwide and represents a
                                     Investing in a monitoring solution for both the NNOC
feather in South Africa’s cap to     and the Information Technology Center (ITC)
                                     represents yet another step for Telkom towards
have gone from a very low tech       preparing its network for the future. This new NNOC
                                     officially began monitoring the network on October
to a very high tech base in such a   22nd 1999.
short time.

                                                           innovators in image processing
    Poly-Silicon projection, a technology
developed and owned by Barco, produces
           a bright and impressive image

                                            Poly-Silicon, the technology
                                            to go with
                                            The need for a centralized
                                            approach to network management
                                            became increasingly obvious as
                                            time went on and Telkom began to
                                            consider what technology would
                                            be optimum for use in a video wall.

                                            Eventually an open public tender
                                            was put out to various players to
                                            suggest technological options.
                                            The possibility of using CRT’s
                                            (Cathode Ray Tubes) was mooted
                                            but Telkom rejected these on the
                                            grounds that they were heavy on
                                            electricity, created burn marks on
                                            the phosphor coating inside the
                                            tube if used for too long, and
                                            tend not to last. Other companies
                                            in the tender suggested DLP
                                            (Digital Light Processing) chips,
                                            but these were rejected because
                                            of potential support problems.

                                            Barco, whose products are locally
                                            supported and distributed, had
                                            also pitched the idea of DLP’s, but
                                            at the same time suggested Poly-
                                            Silicon projection. This is a
                                            technology they have developed
                                            themselves and is the latest type
                                            of LCD technology.
It uses less lamp power to produce    When the basic structure was in        The projectors with sets of mirrors
the same brightness as other          place, the framework needed to         fold the image into the sixty-
technologies, but the lamps last      be balanced and leveled. A             seven inch screen. This method
up to 8000 hours at a stretch.        precise alignment of the walls was     was used to enable them to keep
In addition Poly-Silicon is           of critical importance to make         the cube structure small,
producing a brighter image and        sure the screens would look like       otherwise the projector would
scored the highest overall score in   one logical screen, the entire         need to be placed a couple of
a test of a number of criteria,       length of the structure.               meters away from the screen.
including compliance with the                                                Once the first images were
technical specifications, economic    The next step was placing screens.     successfully projected onto the
empowerment, local content,           Each screen is sixty-seven inches in   screens, it was necessary to color
life-cycle cost of the product and    diagonal, and enormous patience        balance the wall to make sure
delivery. Since Poly-Silicon is a     was required to seamlessly stitch      that the exact color being
technology owned and developed        them together. The eventual            projected through the system was
by Barco, Telkom felt that this       allowance is an extraordinary one      precisely the color being displayed
guaranteed company support.           millimeter of space between each       on the screens. A color meter was
This will not change during the       of the cloths. This patented           then used to measure the color
lifetime of the wall and Barco has    ‘stitch’ technique allows multiple     temperature of each individual
a proven track record in              display screens to move and            cube in degrees Kelvin, with
producing world class 24-7-365        expand when necessary, but this is     adjustments made to bring all the
control centers.                      minimal, considering the fact that     cubes to the same uniform
                                      the air conditioning keeps the         temperature.
Installation with Accuracy            temperature constant. The screens      The final step was the integration
and Speed                             are of a very special construction.    of the software in the building,
The basic aluminium framework         The screen is a high gain fresnel      primarily between Telkom’s
for holding the whole structure       screen type and produces more          management and applications
together was the necessary first      than three times the light output      software, allowing
step. It consists of moveable metal   compared to a diffusion screen.        communication between the two
poles and partitions to house the     The fresnel lens works on a similar    and ensuring a seamless flow of
projectors.                           principle to that of the light rays,   information from the outside
                                      thus giving more output. So,           world to the video wall.
                                      when combined with the XGA
                                      resolution of the projector
                                      behind, the performance is very
Software Integration                                Resolution Revolution
Once greenlighted, the wall was                     The resolution of the wall at the
able to receive signals from its                    NNOC is rightfully claimed to be
exterior source. The flow of                        the highest resolution and the
information from the outside                        biggest in the world, measuring
world follows a pattern. The                        as it does twenty-seven metres
video signal is received by two                     wide by four meters high. The
DSTV decoders in the crisis room                    total width available is one
(ERAC) on the ground floor and                      hundred and twenty metres and
fed to a Central Control System                     another fifty-four metres are soon
(controlled by a LAN). When an                      to be installed. The resolution is
image needs to be stretched too                     achieved through sheer
many times its original size,                       multiplication. Each XGA cube
special Video Insertion Units                       screen consists of 1,024x768
(VISU) resize the image by                          pixels, with eighty cubes placed
recalculating it, freeing the                       twenty across and four high, the
system from the bottle-neck of a                    total resolution equals 20x1,024
computer’s PCI bus.                                 by 4x768. That equates to a total
In addition to the image being                      wall resolution of 2,048x3,072 –
monitored in large-screen format                    over sixty-two million pixels! Since
on the video wall, it can also be                   the object of the wall is to project
examined in detail on any one of                    a huge image with a very high
hundreds of PC’s in the area in                     brightness and resolution, it
front of the wall.                                  succeeds admirably.
One of the PC’s on the floor is a
management tool for the
configuration and manipulation
of data that needs to be displayed
and analysed. This information
can be displayed, sized, or used in
any way the technician wants, as
he accesses it on his PC for further
use and analysis. For this purpose
PC management software called
OSIRIS facilitates this function.

Barco Control Rooms                                                                                                  BarcoProjection
a business unit of BarcoProjection                                                                                   is an ISO 9001
BarcoProjection - Belgium                                                                                            registered company.
                                                                                                                                                Ref. no: R599534 - February 2002 - Printed in Belgium

Phone (32) (56) 36-8211 • Fax (32) (56) 36-8248
                                                                                           The information and data given are typical for the
Barco Control Rooms GmbH - Germany
Phone (49) (721) 6201-0 • Fax (49) (721) 6201-298                                          equipment described. However any individual item
E-mail                                                               is subject to change without any notice.

Barco Inc. - USA
Phone (1) (770) 218-3200 • Fax (1) (770) 218-3250

Barco Ltda. - Brazil
Phone (55) (11) 3842-1656 • Fax (55) (11) 3045-1160

Barco Co., Ltd. - Japan
Phone (81) (3) 5950-8100 • Fax (81) (3) 5950-8110

Barco Electronic Systems Ltd. - Hong Kong
Phone (852) 2172-5600 • Fax (852) 2397-1903