4.0 INSTALLATION
After you have configured the DCE/DTE strap, all you need to do
is plug the Model 2020 or 2020N into the proper device ports. Figures
4 and 5 showhow to intstall the Model 2020/2020N.
*NOTE: The diagrams below show the Model 2020 in the installed
application. If you are using a Model 2020N, connect the RS-232
interface directly to the RS-232 equipment and connect the V.35
interface to the V.35 interface using a cable no longer than
164 feet (50m).
4.1 CONNECTING AN RS-232 DTE TO A V.35 DCE*
Figure 4 (below) illustrates proper connection of an RS-232 DTE
to a V.35 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DCE.
4.2 CONNECTING A V.35 DTE TO AN RS-232 DCE*
Figure 5 (below) illustrates proper connection of a V.35 DTE to
an RS-232 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DTE.
4.3 CONNECTING THE MODEL 2020-25
The Model 2020-25 is connected the same way as the standard
Model 2020, with the exception that the V.35 interface has a DB-25
connector instead of an M/34 connector. The DB-25 carries the same
signals as the M/34, but is pinned according to the RS-530 Standard.
Please refer to Appendix B for specific pin out information.
APPENDIX A.
MODEL 2020 AND 2020N SPECIFICATIONS
Interfaces:
EIA RS-232/ITU/CCITT V.24 to ITU/CCITT
V.35/EIA RS-530
Data Rates:
0 - 384 Kbps
Transmission Mode: Synchronous, full or half duplex
Protocol:
Transparent to protocol
Clocking:
Set by connected devices
Connectors:
All Versions: DB-25 male or female on
RS-232 side;
Model 2020: M/34 male or female on V.35
side at the end of 6 ft. cable.
Model 2020-25: DB-25 male or female on
V.35 side at the end of 6 ft. cable.
Model 2020N: RS-232 Male with M/34
male or female on V.35 side OR, RS-232
female with M/34 male.
Power Supply:
None required. Uses power from NIC data
and control signals
Temperature Range:
0-60 degrees C (32-140 degrees F)
Altitude:
0-15,000 feet (0-5,000 meters)
Humidity:
5 to 95% noncondensing
Dimensions:
Model 2020: 2.66"L x 2.10"H x 0.73"W
(6.76cmL x 5.33cmH x 1.85cmW)
Model 2020N: 2.40”L x 1.73”H x 0.89”W
(6.10cmL x 4.39cmH x 2.26cmW)
Weight:
Model 2020: 14 oz, including cable and
connectors
Model 2020N: 2.2 oz
7
8
Sync. Terminal
(DTE)
V.35 Modem
(DCE)
Figure 4. A Common RS-232 DTE to V.35 DCE Installation
V.35 Mini Computer
(DTE)
Sync. Modem
(DCE)
Figure 5. A common V.35 DTE to RS-232 DCE installation