Black Box ME615A User manual

MARCH 2007
ME615A ME615AE
ME616A
ME616AE
CUSTOMER SUPPORT
INFORMATION
Order toll-free in the U.S.: Call 877-877-BBOX (outside U.S. call 724-746-5500)
FREE technical support 24 hours a day, 7 days a week: Call 724-746-5500 or fax [phone]
Mailing address: Black Box Corporation, 1000 Park Drive, Lawrence, PA 15055-1018
Web site: www.blackbox.com • E-mail: [email protected]
Miniature Asynchronous
Modems

Declaration of Conformity
The Async Mini Fiber Optic Modem conforms to the
following standard(s) or other normative document(s):
EMC:
EN 55022 (1994): Limits and methods of measurement
of radio disturbance characteristics of information
technology equipment.
EN 50082-1 (1992): Electromagnetic compatibility –
Generic immunity standards for residential, commercial
and light industry.
Supplementary Information:
The product herewith complies with the requirements of
the EMC Directive 89/336/EEC. The product was tested
in a typical configuration.

Application 5
ME615A, ME615AE,
ME616A, ME616AE
1. Features
• Provide asynchronous transmission at data rates of up to 115.2 kbps
• Operate in full-duplex over 4-wire or half-duplex over 2-wire and 4-wire lines
• Meet ITU RS-485 and ITU V.11 requirements
• Meet ITU V.54 and ITU V.52 requirements (in V.11 only)
• Operate over multimode fiber optic cables
• Point-to-point or multipoint applications with up to 32 units in RS-485
• Six LED indicators
• Miniature, lightweight and easy to install
• Operate with an external power supply
2. Application
Figure 1. Typical Application

ME615A, ME615AE, ME616A, ME616AE
6 Description
3. Description
ME615A, ME615AE, ME616A, ME616AE , asynchronous RS-485 miniature fiber
optic modems, transmit an RS-485 or V.11 signal via a fiber optic link. They are
typically used for data transmission in utility applications. The asynchronous data
rate can be up to 115.2 kbps in full- or half-duplex mode.
The modems perform diagnostic loopbacks in compliance with ITU V.54 standard.
Two V.54 loopbacks are available: local analog (Loop 3) and remote digital
(Loop 2). The loopbacks are activated via external DIP switches. Local digital
loopback is also available. The loopbacks are available in V.11 mode only.
The devices include a built-in V.52 standard BER tester for testing link integrity.
The internal BER tester is activated by an external DIP switch. The ERR LED blinks
when an error is detected in the data transmission.
ME615A, ME615AE, ME616A, ME616AE incorporate all the advantages of a fiber
optic system, providing:
• Lower attenuation than with copper wire
• EMI/RFI immunity, saving the cost of expensive and heavy shielding, and
complex error checking routines
• Almost absolute security and reduction in the cost of data encryption
• Eavesdropping is virtually impossible as negligible power is radiated from the
fiber
• Safety and electrical isolation: no spark hazard and no ground-loop noise
problems.
The modems operate with an external 9 VDC, 300 mA power supply.

ME615A, ME615AE, ME616A, ME616AE
Technical Specifications 7
4. Technical Specifications
Fiber Optic Interface Transmission Line Optical duplex cable
Transmission Mode Full- or half-duplex
Fiber Optic Characteristics See Table 1
Fiber Optic Connectors ST, FC, or SC
DTE Interface Type V.11 over 4-wire
RS-485 over 2-wire or 4-wire
Data Rate Up to 115.2 kbps
Pulse Width Distortion Less than 25%
DTE Transmission Mode Full- or half-duplex, user-selectable
DTE Connectors RJ-45 or 5-clip terminal block
LED Indicators TD (yellow) – Transmit Data
RD (yellow) – Receive Data
ERR (yellow) – BERT error
RTS (yellow) – Request to Send
DCD (yellow) – Data Carrier Detect
TST (red) – A test is active
Power 9 VDC, 300 mA
Physical Length 10.0 cm (3.9 in)
Height 2.3 cm (0.9 in)
Width 5.3 cm (2.1 in)
Weight 140g (4.9 oz)
Environment Temperature 0–50°C (32–122°F)
Humidity Up to 90%, non-condensing

ME615A, ME615AE, ME616A, ME616AE
8 Installation
5. Installation
When setting the jumpers or performing any actions inside the open product, be
careful not to bend or break any components.
 To install ME615A, ME615AE, ME616A, ME616AE :
1. Open the plastic case by pressing on the points indicated on the sides.
2. Configure the modem according to the desired mode (see Figure 1 and
Table 1).
S2
CARR. HOLD
1.1
PATT
DIG
ANA
REM
4.4
8.8
17.7
S1
S3
ON
ON
ON
H.D/F.D 4W/2W
Figure 1. DIP Switch Locations
3. For full- or half-duplex operation over 4-wire:
 Set the H.D./F.D. switch to F.D. for full-duplex or H.D. for half-duplex
 Set the 4W/2W switch to 4W.
4. For half-duplex operation over 2-wire:
 Set the H.D./F.D. switch to H.D.
 Set the 4W/2W switch to 2W.
5. Set the CARR. HOLD switch to 4.4 msec.
6. Close the unit by pressing the two halves of the unit together.
7. Connect the DTE:
For the terminal block versions:
 Connect the 4- or 2-wire UTP or STP line, observing the following polarity:
4-wire: TDA and TDB clips are data output from the modem; RDA and
RDB clips are data input to the modem (see Figure 2).
2-wire: RDA and RDB clips are data input/output in and from the modem
(see Figure 2).
Caution

ME615A, ME615AE, ME616A, ME616AE
Installation 9
TDB
GND
RDB
RDA
TDA
Figure 2. Terminal Block Connector Pinout
For RJ-45:
 Plug the cable into the RJ-45 jack (see Figure 3).
1 8
8
1
RJ-45 plug (male)
clip at rear
RJ-45 jack (female)
external view
8 NC
7 NC
6 TDA
5 RDB
4 RDA
3 TDB
2 GND
1 NC
Figure 3. RJ-45 Connector Pinout
8. Connect the line:
 Remove the plastic dust caps from the fiber optic connectors, and connect
the cable, observing the following polarity:
 Connect Tx on the local modem to Rx on the remote modem
 Connect Rx on the local modem to Tx on the remote modem.
9. Connect the external power supply to ME615/6 A/AE, and then plug it into the
mains.

ME615A, ME615AE, ME616A, ME616AE
10 Installation
Table 1. DIP Switch Settings
Switch Switch
Identity
Function Possible Settings
(Factory settings shown in bold)
S3-1 H.D./F.D. Selects the transmission mode on the
DTE side
H.D. – Half-duplex operation, RS-485
F.D. – Full-duplex operation, V.11
S3-2 4W/2W Selects the operation type of the
RS-485 interface
4W – 4-wire operation
2W – 2-wire operation
S2-1,
S2-2,
S2-3,
S2-4
CARR. HOLD
(see Note)
Selects the length of time that the
modem maintains transmission when
received data from RS-485 interface
becomes mark or idle (carrier delay)
1.1 msec
4.4 msec
8.8 msec
17.7 msec
S1-1 PATT Controls the BER testing See Operation (OFF)
S1-2 DIG Controls the local digital loopback See Operation (OFF)
S1-3 ANA Controls the local analog loopback See Operation (OFF)
S1-4 REM Controls the remote digital loopback See Operation (OFF)
Set the carrier delay to 1.1 msec when working at the high data rate.
For the low data rate applications, set the carrier delay to 17.7 msec.
Note

ME615A, ME615AE, ME616A, ME616AE
Operation 11
6. Operation
Normal Operation
For normal operation, make sure that the test and diagnostic switches (S1-1, S1-2,
S1-3, and S1-4) are set to OFF (see Figure 4).
Tests and Diagnostics
Figure 4. Front Panel Test and Diagnostic Switches
BERT Test Mode V.52
BERT enables testing of the local modem and the communication line. When the
PATT DIP switch is set to ON, the modem generates and transmits standard V.52
pattern (511-bit pseudo-random) and checks its response. If errors are detected,
the ERR indicator LED lights. The test can be carried out in local analog loopback,
in remote digital loop, or in normal point-to-point operation, opposite a remote
modem.
V.54 Loopback Tests
FOM-485 features diagnostic loopbacks according to ITU V.54. The modem
performs local analog loopback (ANA), as well as local and remote digital
loopbacks (DIG, REM). All tests are controlled by the S1-2, S1-3, S1-4 switches.
The TST LED turns on when a diagnostic loopback is active.
The ANA V.54 loopback (Loop 3) tests the local FOM-485 only. The XMT signal is
returned to the receiver (see Figure 5).
The REM V.54 loopback (Loop 2) tests the remote modem and the
communication link (see Figure 6).
To return to normal operation, set the test DIP switches to OFF.

ME615A, ME615AE, ME616A, ME616AE
12 Operation
Figure 5. Local Analog Loopback (ANA)
Figure 6. Remote Digital Loopback (REM)