Tài liệu LoopStar® 800/1600 SONET Access System DS3 Transmux Card Provides DACS Functionality pdf

APPLICATION NOTE
www.adc.com • +1-952-938-8080 • 1-800-366-3891
LoopStar
®
800/1600 SONET Access System
DS3 Transmux Card Provides DACS Functionality
As bandwidth needs have increased, enterprise customers have found it more economical to
aggregate traffic from remote offices and have it backhauled to the data center via a DS3.
For the carrier, this presents a problem. The carrier must be able to access the DS1s within
the DS3 and then cross-connect them to the appropriate VT1.5s within the SONET payload.
Traditionally, this operation has been performed using a Digital Cross-Connect System (DCS)
and a SONET ADM. Obviously, requiring two separate devices for this function increases
CAPEX and OPEX for the carrier. With the LoopStar 800/1600 SONET Access System’s DS3
Transmux card, there is now a simpler, more economical, solution for this problem.
STS-1 #1
STS-1 #2
STS-1 #3
SONET
Interface Card
DS3 #1
DS3 #2
DS3 #3
Any STS to Any DS3
DS3 Interface
Card
1-28 DS1s
1-28 DS1s
1-28 DS1s
SONET
Interface Card
Transmux

Card
Any VT1.5 to any DS1
within a DS3
STS-1 #1
STS-1 #2
STS-1 #3
DS3 #1
DS3 #2
DS3 #3
DS3 #4
DS3 #5
DS3 #6
Standard DS3:
Point-to-Point DS3
Transmux:
DACS-like
Functionality
APPLICATION NOTE
Functionality
The DS3 Transmux card is capable of terminating up to 6 DS3
electrical signals. Currently, two of these cards can be deployed
in the LoopStar 800/1600 SONET equipment providing a total
of 12 DS3 connections. A protection card with front test access
ports is also available. Since the LoopStar 800/1600 SONET
Access System supports VT1.5 grooming, a carrier can provide
T1s to their end customers, transport them as VT1.5s over the
SONET network, and then efficiently multiplex them into the
appropriate DS3s for backhaul to the customer’s data center.
Without the DS3 Transmux card, each of these VT1.5s would
need to be cross-connected to a DS1 and then electrically

dropped to a DCS, which would multiplex the DS1s into a DS3
for transport. Providing both VT1.5 grooming and the transmux
functionality in a single platform reduces both CAPEX and
OPEX, while providing maximum service flexibility.
Service Flexibility and Cost Savings
Since each port can be configured to operate in channelized or clear channel mode, carriers do not have
to buy a separate DS3 card to support different applications. Of course, this also decreases the number
of spare cards required. In addition, the same card can be used for both port and portless transmux
functionality. Portless transmux functionality refers to the ability to access VT1.5s within one STS and
cross-connect them into one or more different STSs without requiring them to be dropped electrically.
This feature is supported on a port-by-port basis as well; therefore, one card can support any of the
possible DS3 connection applications that may arise within a network. Incorporating all this functionality
in one card can save a carrier 50% or more in initial CAPEX and ongoing OPEX expenditures.
Network Reliability
Tributary protection is available for any TDM interface on the LoopStar 800/1600 SONET Access products.
For the transmux card, it is 1:n (n=1 or 2). With its protection flexibility, the LoopStar SONET Access
System provides one of the most reliable and versatile solutions available for use in transmux applications.
Summary
In summary, the LoopStar 800/1600 SONET Access System enables carriers to drastically reduce their
cost and operational issues regarding DS3 backhaul. Using the transmux card, carriers can efficiently
groom traffic between optical connections or between STS-ns and DS3s. Providing this functionality on a
per-port basis within a single card, significantly reduces CAPEX and OPEX for carriers.
Web Site: www.adc.com
From North America, Call Toll Free: 1-800-366-3891 • Outside of North America: +1-952-938-8080
Fax: +1-952-917-3237 • For a listing of ADC’s global sales office locations, please refer to our web site.
ADC Telecommunications, Inc., P.O. Box 1101, Minneapolis, Minnesota USA 55440-1101
Specifications published here are current as of the date of publication of this document. Because we are continuously
improving our products, ADC reserves the right to change specifications without prior notice. At any time, you may
verify product specifications by contacting our headquarters office in Minneapolis. ADC Telecommunications, Inc.
views its patent portfolio as an important corporate asset and vigorously enforces its patents. Products orfeatures

contained herein may be covered by one or more U.S. or foreign patents. An Equal Opportunity Employer
102855AE 6/06 Original © 2006 ADC Telecommunications, Inc. All Rights Reserved
OC-n
DS1s
LoopStar 800/1600
SONET Access
System
DS1s
VT1.5s are
cross-connected
to DS1s within
the DS3
DS3