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Welcome
to NComm's WAN Developer's Update! |
By subscription only! Welcome to your next issue of NComm
WAN Developer's Update. You are receiving
this newsletter because you are a current user of NComm's
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| IN THIS ISSUE |
Table of Contents |
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| TMS
Release News |
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TMS Version 6.x Reduces MIPS Requirement
for Telephony Applications by 20%
TMS
Version 6.0 is now fully released for T1, E1, T3, E3,
SONET and SDH. Version 6.0 incorporates
major changes to meet the expanding needs of wide area network
interfaces for
products
today
and
tomorrow.
As more "nested" (eg T1 within T3 within OC-3)
WANs are deployed, processing efficiency becomes more critical as
the
burden for fault
isolation and segmentation increases. NComm's new version
of its TMS software line meets these new requirements as it continues
its
tradition
of making WAN interfaces easy to add to customer as well as network
equipment.
Among
the many important improvements achieved in this release
is the MIP consumption when T1 Robbed-Bit Signaling or
E1
Channel
Associated Signaling is used. Previous TMS versions consumed
about 1 1/4 MIPS per T1 span and proportionally higher for
E1. The new version is now scoring below 1 MIP per span for
framer devices that do not utilize the indirect register
access method in the process. Devices that require indirect
access
methods
are also proportionately faster.
This
improvement is of minor importance for equipment with low
span densities. However, when breaking out T1s and E1s
from optical interfaces, the resulting T1/E1 spans can mount
up fast. In these applications, this MIP reduction is significant.
Another improvement is that 6.0 presents the Customer with
greater flexibility in the assignment of CPU and Operating
System resources to the TMS. This results in much more efficient
execution and memory usage.
NComm's
TMS V.6.0 requires updated drivers. Contact us for current
availability. |
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| Technology
Highlight |
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Automatic
Protection Switching - Equipment vs. Facility
We see allot
of confusion between equipment and facility protection
switching. They are different and one needs to be clear
about which one they are accommodating. One backs up the
transmission facilities in case service in interupted for
any reason. The other backs up local pieces of equipment
in case they stop working. Both of these capabilities might
be required, but they represent two different design and
engineering tasks. Keeping them clear at the outset will
insure that design requirements are properly met.
Equipment
protection switching provides for the potential
failure of hardware. The transport facility (copper pair,
coax, fiber, etc.)
is assumed to remain functional. During a hardware failure
event, alternate hardware is substituted for transmission
on the original facility. This can be accomplished with
spare cards and a matrix switch, dedicated equipment sparing
(1:1) with splitters, or relays that re-point the facility
to a different hardware port. Usually, protection ports
are on different boards from the protected ports avoiding
cascading failure as well as making the repair of failed
hardware unobtrusive.
Facility
protection switching provides for the
potential failure of the transport facility itself. Redundant
facilities are provisioned that
may be switched into the original port or a new port. A
very important consideration in facility protection is
alternate path back-ups. It is foolish and risky to have
the protection and protected circuits running in the same
binders along the same physical paths. Common causes of
facility damage include back-hoe incidents and earth quakes.
Poor facility planning can easily result in the protection
circuit going down with the protected circuit.
Both of these
protection objectives require minimum service disruption
and deliver continuity of alarm management and performance
monitoring. As in the case of SONET and SDH, schemes can
be devised
that provide restoral in a matter of milliseconds. Protection
switching at these speeds can even be accomplished without
dropping telephone calls before full service is restored.
In the "old
days", dial restoral systems actually provided both
equipment and facility protection by using different technologies
for restoral. This technique can still be used today by
protecting a subset of the traffic with a slower (and cheaper)
wide area network service.
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| From our Readers: |
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Reader Questions - Coming Soon!
Do you have
a question about Wide Area Network Interfaces? Send it
to readerquestion@ncomm.com.
If we include your question and answer in our next newsletter,
we will
send you your very own NComm 100% cotton T-shirt! |
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| NComm
Overview |
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NComm
continues to offer an expanding set of Wide Area Network
telecom source code (TMS), and custom consulting services,
that completely address all of the overhead functions needed
to place and maintain a WAN interface in the network. Included
in this are Configuration, Alarms, Maintenance/Performance
Monitoring and CAS signaling. We do this for any framer
device, RTOS and processor you decide to design with. Prior
to 2003,
full support was offered for T1, E1, T3, E3 and SONET including
Linear
Automatic Protection Switching. This
year we added SDH including Linear APS.
TMS users experience very fast implementation
times. Once debugged hardware is available, typical integration
time
is few days. There is no faster way to produce
a standard compliant, fully functioning WAN interface.
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| Copyright Information |
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Copyright 2003 NComm, Inc. |
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