omnitron-systems-technolo iconverter x21 ユーザーズマニュアル

a. The X21 Serial Media Converter is available in tabletop and wall-mounting models.

For wall-mounting, attach the unit to a wall, backboard or other flat surfaces. For
tabletop installations, place the unit on a flat level surface.  Attach the rubber feet to
the bottom of the unit to prevent the unit from sliding.  Make sure the unit is placed
in a safe, dry and secure location.

To power the unit using the AC/DC adapter, connect the AC/DC adapter to the AC
outlet.  Then connect the barrel plug at the end of the wire on the AC/DC adapter to
the 2.5mm DC barrel connector (center-positive) on the chassis.  Confirm that the
unit has powered up properly by checking the power status LED located on the
front of the unit.

To power the unit using a DC power source, prepare a power cable using a two-
conductor insulated wire (not supplied) with a 14 AWG gauge minimum.  Cut the
power cable to the length required.  Strip approximately 3/8 of an inch of insulation
from the power cable wires.  Connect the power cables to the standalone unit by
fastening the stripped ends to the DC power connector.

Connect the power wires to the DC power source. The Power LED should indicate
the presence of power.

b.  When using the SFP model (8859-0), insert the SFP Fiber transceiver into the Port

1 SFP receptacle on the X21 converter (see SFP Data Sheet 091-17000-001 for
supported transceivers).

c. Connect the included adapter cable to the serial port on the X21 converter.  Use

the appropriate gender plug to attach the X.21 device.

d. Connect an appropriate multimode or single-mode fiber cable to the fiber port of

the installed module. It is important to ensure that the transmit (TX) is attached to
the receive side of the device at the other end and the receive (RX) is attached to
the transmit side. Single-fiber (SF) media converter models operate in pairs.  The
TX wavelength must match the RX wavelength at the other end and the RX
wavelength must match the TX wavelength at the other end.

The serial port is a DE-15 female connector with the following pin-out configuration.

 

4 

1 

10 

6 

15 

11 

3 

2 

5 

7 

8 

9 

14 

13 

12 

When this DIP-switch is in the Terminal Timing Clock “TTC” (default) position, the clock
edge used to sample the data on the serial port is defined by the TIA/EIA-334-C specification.
When the DIP-switch is in the Terminal Timing Clock Inverted “Inv” position, the data on
the serial port is sampled on the inverted clock edge.

When “L-LB” is selected, the serial port data signals are looped back to the attached
device.  At the same time, the fiber port is looped.  If the module has Terminal Timing
enabled (see DIP-SWITCH BANK 1), the clock signals are also looped back to the
attached device.

DCE:
DCE Interface enabled

DTE:
DTE Interface enabled

RC:
RXC Clock polarity normal

Inv:
RXC Clock polarity inverted

TTC:
TXC Clock polarity normal

Inv:

TXC Clock polarity inverted

Norm:
Loopback disabled

L-LB:
Loopback enabled

When this DIP-switch is in the “Off” (default) position, Terminal Timing is disabled.
When this DIP-switch is in the “On” position, Terminal Timing is enabled.  When Terminal
Timing disabled, it uses the ‘Signal Element Timing’ clock (SET clock, circuit S, X.21
pin pair 6, 13) as supplied by the DCE device to time Transmit data (TXD) and Receive
data (RXD). This is called Contra-directional Timing.  When Terminal Timing is enabled,
it uses ‘DTE Signal Element Timing’ clock (DTE SET clock, circuit X, X.21 pin pair 7,
14) as supplied by the DTE device to time TXD, and uses ‘Signal Element Timing’
clock to time RXD. This is called Co-directional Timing.

When Terminal Timing is used, both the local and remote modules must be set to use
Terminal Timing, as well as the devices connected to each module. All four units must
be in Terminal Timing Mode.

Off:

Terminal Timing disabled

On:

Terminal Timing enabled

Off:
Reserved

On:
Reserved

Off:
Reserved

On:
Reserved

Off:
Reserved

On:
Reserved