ME260A - Black Box

Specifications:
BLACK BOX
PWR
TD-1
TD-1
MODE
RD-1
RD-1
TD-2
TD-2
RD-2
RD-2
RATE
Int. Elastic Modem
INT.
Elastic Modem
Conv.
Elimin.
Conv. Buffer
Buffer
Elimin.
6
0 -02048
- 2.048 K
K
1 -11544
- 1.544 K
K
- 1.024 K
2 -21024
K
3 - 768 K
3 -4 - 768
512 K
K
4 -5 - 512
384 K
K
256 K
K
5 -6 - 384
7 - 128 K
6 - 256 K
7 - 128 K
8 K- 48 K
8 - 48
9 - 56
9 K- 56 K
A - 64
A K- 64 K
B - 112K
B - 112 K
Transmission Format: Synchronous
Transmission Mode: Full- or Half-Duplex
Timing: Internal Clock (user-selectable from front-panel switch): 48, 56,
64, 112, 128, 256, 384, 512, 768, 1024, 1544, and 2048 Kbps.
External Clock: Up to 2048 Kbps
RTS/CTS Delay: Internal Jumpers; 0, 6, or 51 ms.
DCD: Internal Jumpers; Continuously ON or controlled by the RTS signal
Interface Modules:
Elastic Buffer Size: (2) buffers, 256 bits each.
ME261C:
ME262C:
ME263C:
ME265C:
ME266C:
ME267C:
ME268C:
Mode Select
ME
IC
TE
JP6
Chassis Gnd
Connect
Disconnect
JP7
Jumper Settings:
CTRL
ON
DCD for Port 2
JP1: Selects the delay between the activation of the RTS line in connector J2
and the acitvation of the CTS line in the same connector.
CTRL
ON
DCD for Port 1
JP2: Selects the delay between the activation of the RTS line in connector J1
and the activation of the CTS line in the same connector.
INT
Transmit Timing
JP5
JP4
JP3
Interface = RS-232; (1) DB25 female connector.
Interface = V.35; (1) M/34 Block female connector.
Interface = X.21; (1) DB15 female connector.
Interface = RS422/RS449; (1) DB37 female connector.
Interface = G.703; (1) DB15 female connector.
Interface = Coax; (1) Coax female connector.
Interface = T1; (1) DB15 female connector.
EXT
JP2
0 ms
6 ms
51 ms
RTS/CTS Delay Port 1
0 ms
6 ms
51 ms
RTS/CTS Delay Port 2
JP3: Selects the timing source in the ME mode:
INT: Modular Modem Eliminator internal oscillator. The data rate is
determined by the RATE selector.
EXT: The transmit clock applied to connector J1. The data rate
equals the clock rate.
JP1
JP4: Carrier Detect: (ME mode ONLY)
ON: The DCD line in connector J2 is continuously on.
CTRL: The DCD line in connector J2 follows RTS
JP5: Carrier Detect: (ME mode ONLY)
ON: The DCD line in connector J1 is continuously on.
CTRL: The DCD line in connector J1 follows RTS
JP6: Selects the Modular Modem Eliminator operating mode:
ME = Modem Eliminator
IC = Interface Converter
TE = Elastic Buffer
ME260A
JP7: Connects of Disconnects signal ground to chassis ground.
Connectors: Determines the modules that are inserted.
Power: ME260A;115VAC, 60 Hz, 5watts. ME260AE;230VAC, 50 Hz,
5 watts
Maximum Distance: 330 ft.
Operating Modes:
Modem Eliminator Mode: The unit is used to connect two DTE's, thereby
replacing two synchronous modems. The interface-conversion
function of the unit allows connecting even DTE's with different
interfaces, in addition to the modem-eliminator function. In this
mode, the unit fully emulates the operation of two modems
connected in a link (one for each DTE). This includes supplying
clock signals and handshaking control signals. The data rate is
derived from an internal oscillator, and is selected by mean of the
front-panel switch. Any standard rate in the range of 48 Kbps to
2048 Kbps can be selected. Both modules can also use External
Timing: With External Timing, the unit accepts an external clock in
the range of 1.2 Kbps to 2048 Kbps. This permits the transfer of
system timing from one side to the other (clock locking). The
maximum range that can be archieved depends on the interface
type, cable type, and data rate, and can be up to 330 ft.
Interface-Converter Mode: In this mode, lets you connect a DTE device to a
DCE device that has a different interface. A physical and electrical
conversion between the DTE and DCE interfaces is performed.
The data rate is determined by the equipment connected to the unit.
Elastic Buffer Mode: This mode is used to connect two independentlyclocked
plesiosynchronous DCE's via FIFO buffers. By providing
bi-directional buffering of data, the unit reduces loss of data that
would otherwise occur because of the difference in clock rates.
The two DCE's can have similar or different interfaces, and the
data rate can be up to 2048 Kbps.