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Black Box Corporation.
BLACK BOX
®
T h e W o r l d ’ s S o u r c e f o r C o n n e c t i v i t y SM
V.35 Synchronous Multiport Line Driver
Short-haul sync data communication over your own twisted-pair cable is a breeze with the V.35 Synchronous
Multipoint Line
Driver.
MP485/35
RTS CD TD RD PWR
DLB LLB TEST
Key Features
Uses your existing twisted-pair cable.
Standalone unit or rackmount card available.
Point-to-point or multipoint.
2- or 4-wire half-duplex, or 4-wire full-duplex operation.
Diagnostic LEDs.
Speeds from 1.2 to 256
Kbps.
DB25 to V.35 adapter included.
T he V.35 Synchronous
Multipoint Line Driver
(MP485/35) gives you shorthaul synchronous data transmission over your own twisted-pair cable. The Line
Driver is available as a standalone unit or a rackmount card. The rackmount version is functionally identical to the standalone unit. You can install the Card in a rackmount chassis that holds up to 16 cards.
The Line Driver has a V.35
port (configured as DCE) that connects to a host computer or terminal (DTE), and a 4-screw terminal block for RS-485 communication over 2- or
4-wire cable.
The Line Driver operates in two- or four-wire half-duplex mode, or four-wire full-duplex mode. Baud rates are switchselectable, and range from
2400 to 256,000 bps.
LEDs on the Line Driver’s front panel indicate flow control (TX, RX, RTS, and CD) and status (TD, RD, PWR).
And three pushbuttons (TST,
LLB, DLB) on the front panel select line and digital loopback tests.
Simply set the internal switches or jumpers to determine these characteristics:
• Speed
• Carrier: constant or switched
• Operation: full- or halfduplex
• TX data clock select
• Node termination
The Line Driver package includes:
• Line Driver (standalone with power supply or card version)
• DB25 to V.35 Adapter
• User’s Manual
Typical Application
The Line Driver works in point-to-point or multipoint synchronous applications over two- or four-wire twisted-pair cable.
1
The diagram at right shows a multipoint application over 2or 4-wire twisted-pair cable.
IBM 3274
Controller
IBM Mainframe
Master
2- or 4-wire
Cable
Node
Node
Node
PC with 3270
Emulation
PC with 3270
Emulation
Technically Speaking
T he Line Driver has diagnostic LEDs, pushbuttons, and DIP switches for easy operation.
• The front panel has LEDs for TD, RD, RTS, CD, and
PWR.
• The front panel has pushbuttons for TST, LLB, and DLB.
• The printed circuit board has DIP switch banks S4,
S5, S6, and S7 to set baud rate, transmit data clock, and node termination.
The ten available speeds are: 2.4, 4.8, 9.6, 19.2, 38.4,
56, 64, 112, 128, and 256
Kbps.
Choose from three transmit data clock settings: Internal
Clock (factory setting),
Recovered Clock, and
External Clock.
Select node termination on or off. The default setting is
TERM on.
Additional equipment you may need:
• Multifunction Rack (16-
Card)
• V.35 Interface Cable
• Unshielded Twisted-Pair
Cable
For these and other components...
Call our expert Technical Support Staff for all your LAN needs. They’ll help you find the best equipment for your application.
Specifications
Speed—1.2, 2.4, 4.8, 9.6, 19.2,
38.4, 56, 64, 112, 128, or 256
Kbps
Interface— Terminal : V.35
DCE, Line: EIA RS-485 twisted pair (26 AWG minimum), DC continuity required
Pins Supported— V.35: CTS,
DCD, DSR, ETCA, ETCB,
FG, RCA, RCB, RDA, RDB,
SG, TCA, TCB, TDA, TDB;
Terminal Block: RXA, RXB,
TXA, TXB
Range—1 mile at 56/64 Kbps on 24 AWG unshielded twisted-pair
Connectors—(1) DB25 female, (1) screw-terminal block; 6-inch (15.2-cm)
DB25 male to 34-pin Mblock V.35 adapter included
Operation—Point-to-point or multipoint
Mode—2-wire half-duplex, 4wire full- or half-duplex
Clocking—Internal, external, or recovered
Carrier—Constant or switched
Loopback—None, line, or digital
RTS/CTS Delay—0, 11, 50, or
160 ms
Indicators—5 LEDs: TX, RX,
RTS, CD, and PWR
Diagnostics—DLB, LLB
Power— Wallmount transformer: 115 VAC, 90 mA or 230 VAC, 45 mA
Size— Standalone: 1.8”H x
5.5”W x 8.5”D (4.5 x 13.9 x
21.5 cm); Rackmount Card:
4.7”W x 7.4”D (11.9 x 18.8
cm)
Weight— Standalone: 1 lb. (0.5
kg); Standalone unit and transformer : 1.5 lb. (0.7 kg);
Rackmount card: 0.5 lb. (0.2
kg)
Ordering Information
This information will help you place your order quickly.
PRODUCT NAME ORDER CODE
V.35 Synchronous Multipoint Line Driver (MP485/35)
Standalone, 115 VAC ...............................................ME521A
Standalone, 230 VAC.............................................ME521AE
Rackmount Card ......................................................ME521C
Multifunction Rack (16-Card).........................................RM005
V.35 Interface Cable...............................................EYN450-0010
