RAD Data comm 4-Wire Symmetrical VDSL Modem ASM-60 Manual de usuario descargar pdf (Pagina 3)

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RAD Data Communications 2009 Catalog

PFH-4

Power Feeding Hub

•

Remote power feeding of up to four

SHDSL wire-pairs (four x 2-wire or two x

4-wire)

•

Output power feeding options per line:

120 VDC @60 mA or 180 VDC @60 mA

•

Terminal block connectors for each line

input and output

•

Current limit protection for each

channel (line and earth)

•

DIP switch allows for selective control

for each wire-pair

•

LED line status indicators

•

Dry contact connectors for alarms

•

All connectors on front of 1U-high, half

19-inch metal enclosure

Although SHDSL modems provide superior reach

in comparison with other DSL technologies, the

maximum range of standard SHDSL modems is

still not sufficient for some longer range

applications, such as those along railways or

pipelines. In such cases, SHDSL repeaters are

employed to duplicate and retransmit the signal.

To simplify deployment and save the cost of

laying power lines, repeaters can operate on a

remote power feeding source. In other words,

they can be powered over the same lines that

carry the data traffic. RAD’s PFH-4 is a remote

power feeding hub designed especially to

support long range SHDSL applications. It

delivers power and data for up to four SHDSL

wire-pairs (four x 2-wire lines or two x 4-wire

lines), eliminating the need for local power

sources for modems or repeaters on the line.

The hub runs on 48 VDC power and can supply

an output of 120 VDC or 180 VDC to each line.

Each SHDSL wire-pair is input to the PFH-4,

which then adds power to the original data

signal. This power output feeds the repeaters

on the line, which retransmit the data signal.

Separate terminal block connectors are provided

for easy connection of the input and output of

each wire-pair.

All lines are protected from overload, short-

circuiting and leakage to earth. At overload, a

current-limiter drops the line, activates an LED

alarm and initiates an auto-restart recovery.

Dry contacts relay major and minor alarm

warnings via a DB-9 connector.

Front panel LEDs indicate the power feeding

status for each line and provide warnings for

current and temperature overload conditions.

An external DIP switch allows selective power

feeding for each individual line.

C O P P E R M O D E M S

For latest updates visit www.rad.com

ASM-40

High Speed Short Range Modem

•

Selectable data rates: 32 kbps to

2.048 Mbps

•

Range up to 1.75 km (1.1 miles)

•

SNMP-managed double modem card

version for LRS-24

•

V.54 diagnostics

•

Digital interfaces: V.24, V.35, X.21,

RS-530, V.36/RS-449, Ethernet (bridge)

or G.703 (HDB3)

•

Optional built-in router

The ASM-40 is a high speed synchronous short

range modem operating at 13 selectable data

rates, from 32 kbps up to 2.048 Mbps with a

range up to 1.75 km (1.1 miles).

The modem transmits data to the line at four

data rates, depending upon the selected DTE

rate or the PCM network. Data rates of 32, 64,

128, 256, 512, 1,024 and 2,048 kbps are

transmitted at 2,048 kbps; data rates of 192,

384, 768 and 1,536 kbps are transmitted at

1,536 kbps; the 1,544 kbps data rate is

transmitted at 1,544 kbps; and the 1,920 kbps

data rate is transmitted at 1,920 kbps.

The modem’s line interface is coded using

HDB3, AMI or B8ZS (strap-selectable). On the

digital side, a choice of V.35, V.36/RS-449, X.21,

RS-530, built-in Ethernet bridge, router or

G.703/HDB3 interfaces is available. This also

enables the ASM-40 to perform as an interface

converter, a rate converter or a repeater for G.703.

The ASM-40 features V.54 diagnostic capabilities

to perform local analog loopbacks and local and

remote digital loopbacks. An internal test

pattern complying with the V.52 standard can be

generated to provide end-to-end integrity

testing.

The ASM-40 is available as a standalone unit or

as a card for the 19-inch ASM-MN-214 rack that

holds up to 14 cards (see page 144).

An SNMP-managed double modem card –

ASM-40CD – is available for the LRS-24 chassis.

This chassis can hold up to 24 modems and

provides management from a central or remote

management station. RADview, RAD’s SNMP

management application, enables configuration,

monitoring and diagnostics for the ASM-40CD

cards, as well as for other modems in the

LRS-24 modem rack.

For latest updates visit www.rad.com

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