RAD Data comm 4-Wire Symmetrical VDSL Modem ASM-60 Uživatelský manuál stáhnout pdf

L A S T M I L E ( L O C A L L O O P )

128

RAD Data Communications 2009 Catalog

“xDSL” is a generic name for a group of technologies

that pass high speed digital transmissions over

twisted copper wire pairs, where DSL stands for

“digital subscriber line.” Included are standard

technologies, such as SHDSL, SHDSL.bis, ADSL,

and VDSL.

The SHDSL.bis standard enables symmetrical transmission

at rates up to 5.7 Mbps over 2-wire, 11.4 Mbps over

4-wire or 22.8 Mbps over 8-wire, to a range of 2.9 km

(1.825 miles). With SHDSL.bis technology, a variety of

services can be deployed over high bandwidth DSL

connections. This compares with SHDSL, which enables

symmetrical transmission at data rates up to 2.3 Mbps

and symmetrical VDSL, which enables transmission at

data rates up to 6, 13 or 26 Mbps for shorter ranges.

Baseband modems

Baseband modems, also known as short haul or short

range modems, connect computers, bridges, routers, and

other digital communications equipment over relatively

short distances, such as inside buildings and campuses or

within cities. The modems overcome limitations of digital

interfaces and can provide LAN extension when connected

to bridges and routers. Many of RAD’s baseband modems

support LAN extension using a built-in remote bridge or

router, with no need for an external one.

Intelligent modems

Intelligent modems (RAD’s “i” series) are baseband

modems with management capabilities. These modems

include a management channel that enables the user at

the central site to configure the unit at the customer

premises, remotely activate diagnostics and receive real-

time alerts on the system status. The management

channel can operate in parallel to the data channel over

the same wire or fiber link.

Fiber optic technology

Deregulation and demands for increased bandwidth have

reduced the price of fiber optic cabling and installation.

Fiber is generally superior to copper wires because it

provides higher bandwidth over longer distances, is

immune to electrical interference and power surges, and

provides data security.

Fiber optic modems are usually smaller and lighter and

consume less power than copper modems.

Fiber optic distance and bandwidth

Distance and bandwidth are determined by fiber type and

light source:

Fiber type – There are two types of fiber optic strands:

multimode and single mode. Multimode fiber allows

propagation of light at various paths, resulting in high

attenuation, while single mode fiber allows a single

transmission path, which results in lower attenuation and

higher speeds.

Light source – Signal attenuation in fiber optics also

depends on wavelength. Low attenuation occurs at three

different wavelengths: 850 nm, 1310 nm and 1550 nm.

Point-to-point wireless links

License-exempt wireless links provide high bandwidth

connectivity over long distances, at a fraction of the cost

and time required to deploy fiber optic cables. Businesses

can also avoid the cost of leased line service by

connecting remote campus locations over wireless links.

The Airmux is RAD’s wireless point-to-point multiplexer. It

aggregates E1/T1 circuits and Ethernet traffic over

wireless links, extending data/voice transmission for tens

of kilometers and miles.

Miniature fiber and short range modems

Miniature short range modems offer the same

communications functions as AC-powered modems but

with fewer features, such as limited diagnostics capability

and no BER tests. Usually, they operate over shorter

distances at lower rates (normally up to 19.2 kbps).

However, certain modems can operate at data rates up to

115.2 kbps in async transmission and up to 128 kbps in

sync transmission. A reference guide on pages 210-211

will help you select the most suitable modem for your

application.

Last Mile (Local Loop)

1 2 3 4 5 6 ... 21 22

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Strany 1 - Last Mile (Local Loop)

L A S T M I L E ( L O C A L L O O P )128RAD Data Communications 2009 Catalog“xDSL” is a generic name for a group of technologies that pass high

Strany 2

4137RAD Data Communications 2009 Catalog• Data rates up to 2.3 Mbps over 2-wire and 4.6 Mbps over 4-wire • Extended range up to 10 km (6.2 miles) •

Strany 3 - High Speed Short Range Modem

138RAD Data Communications 2009 CatalogASMi-54, ASMi-54CSHDSL.bis Modem and MultiplexerThe ASMi-54 SHDSL.bis modem and multiplexer is a cost-effective

Strany 4 - C O P P E R M O D E M S

4139RAD Data Communications 2009 CatalogD S L M O D E M SHigh rate Ethernet services over SHDSL.bis4 x ETH4 x ETHASMi-542W up to 8WASMi-54SDH/SONETI

Strany 5 - FOMi-E1/T1

140RAD Data Communications 2009 CatalogASMi-31Sync/Async 2-Wire Manageable IDSL ModemD S L M O D E M S• 2-wire sync/async, all-rate short range mod

Strany 6 - FOMi-E3, FOMi-T3

4141RAD Data Communications 2009 Catalog• SHDSL line repeaters for operation over 2-wire or 4-wire lines• Based on the SHDSL standard for higher sp

Strany 7 - FOM-E3/ETH, FOM-T3/ETH

142RAD Data Communications 2009 CatalogM I N I A T U R E F I B E R M O D E M Shost. Transmission range (regardless of the data rate):• 3.5 km (2

Strany 8 - FOM-E1/T1

4143RAD Data Communications 2009 CatalogM I N I A T U R E F I B E R M O D E M S /M I N I A T U R E C O P P E R M O D E M S• Converts from RS-

Strany 9 - F I B E R M O D E M S

144RAD Data Communications 2009 Catalog• High density 19" modem rack (up to 14 cards)• Central solution for copper and fiber modems• Compac

Strany 10 - ASMi-52, ASMi-52L

4145RAD Data Communications 2009 Catalog• Transparent modem concentrator • Operates 16 SHDSL, E1 modems on2-wire• Multiple data rates: between 64 k

Strany 11 - ASMi-54, ASMi-54C

146RAD Data Communications 2009 CatalogLRS-24Modular Modem Rack with SNMP ManagementThe LRS-24 is RAD’s manageable access system for providing full co

Strany 12 - D S L M O D E M S

4129RAD Data Communications 2009 CatalogL A S T M I L E ( L O C A L L O O P )412111098Distance(in kilometers)*765432164 128 192 256 384 512 768

Strany 13

4147RAD Data Communications 2009 CatalogT R A N S P A R E N T R A C K S• Transports any traffic over fiber optic or SHDSL.bis links• Modular chass

Strany 14 - S-RPT, S-RPT/4W

148RAD Data Communications 2009 CatalogAirmux-400Broadband Wireless MultiplexerW I R E L E S S M U L T I P L E X E R SVillageNLOSbackhaulingVillageS

Strany 15 - FOM-5A, FOM-6A

4149RAD Data Communications 2009 CatalogW I R E L E S S M U L T I P L E X E R SUp to 80 km(50 miles)Base Station10/100BaseTn x E1/T1n x E1/T1BTSBase

Strany 16

130RAD Data Communications 2009 CatalogPFH-4Power Feeding Hub• Remote power feeding of up to four SHDSL wire-pairs (four x 2-wire or two x 4-wire)•

Strany 17 - ASM-MN-214

4131RAD Data Communications 2009 CatalogThe ASM-20 is a synchronous/asynchronous short range modem operating at selectable rates from 19.2 kbps to 25

Strany 18

132RAD Data Communications 2009 Catalogtwisted pair. Transmit timing is provided internally, derived externally from the DTE or recovered from the rec

Strany 19

4133RAD Data Communications 2009 CatalogF I B E R M O D E M S• Extends the range of equipment with electrical E3, T3 or HSSI interfaces• In-band

Strany 20 - Cellular backhaul extension

134RAD Data Communications 2009 CatalogFOMi-40High Speed Fiber Optic Modem with Remote ControlF I B E R M O D E M S• User-selectable data rates fro

Strany 21 - Airmux-400

4135RAD Data Communications 2009 CatalogF I B E R M O D E M S• Extends the range of E3 or T3 signals over fiber optic cable up to 110 km (68 miles)

Strany 22 - Airmux-200

136RAD Data Communications 2009 CatalogFOM-40High Speed Fiber Optic ModemF I B E R M O D E M S• Selectable data rates: 56, 64, 112, 128, 256, 384,

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