· Full T1 Bandwidth (1.544MB)
· Fractional Bandwidth (128k, 256k, 384k, 512k)
· Fractional Bandwidth (from 3MB to 45MB)
· Burstable technologies available
· OC 3 (155MB)
· Bandwidth intensive applications
T1 is a high speed digital network (1.544 mbps) developed by AT&T
in 1957 and implemented in the early 1960's to support long-haul pulse-code
modulation (PCM) voice transmission. The primary innovation of T1 was
to introduce "digitized" voice and to create a network fully
capable of digitally representing what was up until then, a fully analog
The term T1 circuit is commonly used to identify a multiplexed 24 channel,
1.544 Mbps digital data circuit providing communications between two facilities
or from a local service provider. T1 refers to the transport of a DS-1
formatted signal onto a copper, fiber or wireless medium for deploying
voice, data or video-conferencing services. The T1 is part of an extensive
digital hierarchy that starts with 24 DS0s at 64 kbps. These individual
DS0s are used to provide voice or digital data to support point to point
or network applications. By combining multiple DS0s, a high-speed interface
can be provided to support a synchronous interface to a LAN router or
voice PBX. For distances longer than one mile, a repeater is placed every
mile to regenerate the signal.
Reliable and fast, T1 lines remain the most popular way for businesses
to access the Internet.
This option allows the flexibility of lower cost for lower bandwidth usage
and a high performance dedicated connection. Fractional service allows
scalability with a single set up. Costs are aligned with bandwidth usage.
(T1 increments include: 128K, 256K, 512K, and 1.54MB.)
Sirus Networks Dedicated High-Capacity DS-3 Internet Access
is the ideal solution for businesses that require high-bandwidth access
at a great price. Whether you host high-traffic web sites or need high-capacity
bandwidth on an as needed basis, there's a level of DS-3 service - dedicated,
burstable - that will meet your needs.
Dedicated DS-3 Service
Sirus Networks dedicated DS-3 service is the answer if you need dedicated,
high bandwidth connectivity to support web hosting, high-traffic web sites,
large data and file transfers, multimedia applications, or hundreds of
Internet users. With this service, dedicated point-to-point circuits connect
your LAN directly
to Sirus Networks world-class IP backbone.
Fractional DS-3 Service
If your Internet traffic is predictable throughout the month, then
our Fractional DS-3 access is the service for you. Because this service
is billed at a fixed monthly cost based on the bandwidth level you choose,
it's easy to plan your budget. You can easily adjust bandwidth up or down
as your needs change.
Burstable DS-3 Service
This cost-effective option is ideal for organizations that want the benefits
and potential - but not the entire cost - of full DS-3 bandwidth over
an unshared 45 Mbps digital leased line. When you choose burstable DS-3
service, you pay only for what you use. Monthly billings are based on
traffic samples and are priced in tiers of 3 Mbps increments from 3 Mbps
to 45 Mbps.
SONET is an acronym for Synchronous Optical
NETwork. It defines optical signals and a synchronous frame structure
for multiplexed digital traffic. It is a set of standards defining the
rates and formats for optical networks specified in ANSI T1.105, ANSI
T1.106 and ANSI T1.117.
A similar standard, Synchronous Digital Hierarchy (SDH),
has also been established in Europe by International Telecommunication
Union Telecommunication Standardization Sector (ITU-T). SONET equipment
is generally used in North America and SDH equipment is generally used
everywhere else in the world.
Both SONET and SDH are based on a structure that has a basic
frame and speed. The frame format used by SONET is the synchronous transport
signal (STS), with STS-1 being the base level signal at 51.84 Mbps. A
STS-1 frame can be carried in an OC-1 signal. The frame format used by
SDH is the synchronous transport module (STM), with STM-1 being the base
level signal at 155.52Mbps. A STM-1 frame can be carried in an OC-3 signal.
Both SONET and SDH have a hierarchy of signaling speeds.
Multiple lower level signals can be multiplexed together to form higher
level signals. For example, three STS-1 signals can be multiplexed together
to form a STS-3 signal, and four STM-1 signals multiplexed together will
form a STM-4 signal.
SONET and SDH are technically comparable standards. The
term SONET is often used when referring to either.