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|DEI's Model 1257 SDSL 768Kbps
Modem transfers symmetric data over a single twisted pair copper wire, driving
data at distances up to 13,000 ft. The DSL advanced electronics combined
with complex 2B1Q technology provides DEI's Model 1257 with high performance fiber quality
The modems operate in pairs with a Central unit and a Remote unit. The Model 1257 modems automatically configure and synchronize when powered allowing quick, easy, plug 'n play connections.
From the front panel, select from the push button controls to run common testing features. The front panel LED indicators display testing, and maintenance functions. More comprehensive system monitoring and diagnostics can be performed by using the maintenance port via the RS-232 (DB-9) on the front panel.
The units accommodate a 110/220 VAC power source using DEI's plug-in power module or can receive a direct connection of 48 VDC source. The Remote unit can be powered by the Central Unit through the SDSL line..
Model 1257 offers V.35 or RS-530 interfaces to connect customer equipment to meet various interface applications. The rear panel accommodates a copper line connection of RJ-45 or 2-wire screw down.
V.35 Interface - The V.35 provides a M-34 female connector that
maximizes the use of network equipment with superior performance. The V.35 interface
is a common connection between routers, terminals, bridges and controllers, where V.35
standards are required.
|The Model 1257 transmits 768Kbps data rates across single pair copper wire up to 2.5 miles (13,000 ft).|
|Model 1257 offers front panel LED status, RS-232 maintenance port, diagnostic loop backs and self tests to support quick and easy diagnostics.|
|SDSL employs 2B1Q technology with echo cancellation, and does not require removal of bridge taps that may exist in leased or private analog lines.|
|SDSL utilizes existing copper infrastructure allowing quick installations without the need for costly fiber optic cabling.|
|Install SDSL in your campus area networks for LAN/WAN connections, Video Conferencing, Distance Learning, Internet Access, PBX Network and Voice Traffic Distribution.|
|Start Up Time||Less than 28 Seconds Maximum Per Attempt|
|Line||Single Line Twisted Pair, 120 Ohm characteristic impedance|
|Signal Format||Full Duplex 784Kbps Per Pair, SDSL-2B1Q Code|
|Drive Distance||2.5 Miles (4km) on 24 AWG, 2.3 Miles (3.7km) on 26 AWG|
|Transmit Signal Power||13.4dBm (min), 14.0dBm (max)|
|Transmission Delay||One Way <200uSec|
|Return Loss||18dB 10kHz @ 125 Ohms|
|Loop Provisioning Loss||30dB @ 500kHz|
|LineTerminationConnector||2 Position Screw Terminal & 8 Position Modular Jack (RJ-45)|
|Diagnostics||Local Loop, Remote Loop, Self Test|
|Maintenance Port||SDSL Line Status, Interface Line Status, System Status, 24hr-@ 15 minute intervals and 100 day Performance|
|Front Panel||LED monitoring indicators, Push button reset, Loop Back, Testing|
|Rear Panel||RJ-45 Line Terminator, 2-wire Screwdown Line Terminator, Power Connector, DTE Interface Connector|
|Power and Dimensions|
|Power Requirements||100-250 VAC, 50-60 Hz or local 48 VDC|
|Power Consumption||Central and Remote units locally powered, 5 watts each. Central unit supplying line power to Remote unit, 17 watts.|
|Dimensions||1.52"H x 5.57"W x 9.75"D|
|Operating Temperature||0-50 degree C|
|Connector||V.35 is a M-34 Female, RS-530 is a DB-25 Female|
|Clock Selection||Front Panel Selectable Internal, External, Recovered|
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