Black Box ME521A User manual

1
®
®
BLACK BOX
The World’s Source for ConnectivitySM
© Copyright 1997. All rights reserved.
Black Box Corporation.
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 short-
haul 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.
MP485/35
RTS CD TD RD PWR
DLB LLB TEST
The Line Driver works in point-to-point or multipoint
synchronous applications over two- or four-wire twisted-pair
cable.
Short-haul sync data
communication over
your own twisted-pair
cable is a breeze with
the V.35 Synchronous
Multipoint Line
Driver.
Typical Application
The Line Driver operates in
two- or four-wire half-duplex
mode, or four-wire full-duplex
mode. Baud rates are switch-
selectable, 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
Key Features
• Carrier: constant or
switched
• Operation: full- or half-
duplex
• 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
V.35 Synchronous Multiport Line Driver

2
• Multifunction Rack (16-
Card)
• V.35 Interface Cable
• Unshielded Twisted-Pair
Cable
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.
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 M-
block V.35 adapter
included
Operation—Point-to-point
or multipoint
Additional equipment you may need:
Technically Speaking
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
IBM 3274
Controller
IBM Mainframe
Master
PC with 3270
Emulation PC with 3270 Emulation
2- or 4-wire
Cable
Node
NodeNode
The diagram at right shows a
multipoint application over 2-
or 4-wire twisted-pair cable.
Mode—2-wire half-duplex, 4-
wire 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)
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.
2