Product specifications

Efficient Networks
®
Router family
Technical Reference Guide
Chapter 2: Product Overview
Efficient Networks
®
Page 2-3
IDSL
IDSL (ISDN DSL) A hybrid of ISDN and DSL; it’s an always on alternative to dial up
ISDN. Does not support voice connections on the same line.
• Speed - 144 Kbps
• Max. Distance From CO - 35,000 ft. (6.6 miles)*
• Key Applications - As an alternate solution: it has a longer range than other
DSLs, and is more affordable than dial-up ISDN.
SHDSL
SHDSL (Symmetric high-bit-rate DSL) Standards-based symmetrical DSL that will
become widely used, particularly for business. It uses only a single copper pair but
can be doubled to two pair for twice the bandwidth.
• Speed - 2.31 Mbps over single pair and 4.6 Mbps over two pair
• Max. Distance From CO - 20,000 ft. (3.78 miles)* and more
• Key Applications - low frequencies. Small and mid-sized business and
enterprise branch offices.
VDSL
VDSL (Very high-bit-rate DSL) Still in an experimental phase, this is the fastest DSL,
but deliverable over short distance from the CO.
• Downstream Speed - 13 to 52 Mbps
• Upstream Speed - 16 Mbps upstream
• Max. Distance From CO - 4,000 ft. (three quarters of a mile)*
• Key Applications - Carry high-bandwidth over a short distance.
VoDSL
A Voice over DSL (VoDSL) router allows the delivery of both telephony (voice) and
data services over a single DSL line. It acts as an Integrated Access Device (IAD),
residing on the customer premises and connecting to a DSL circuit. As such, it serves
as a circuit/packet gateway and provides standard telephone service as well as
Internet service via an Ethernet connection. Thus, the user has access to toll-quality
telephone lines and continuous, high-speed Internet and remote LAN services over a
single copper loop.
Key Applications - Small businesses that can balance a need for several phone
extensions against their Internet connectivity needs.