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2270 Fiber Optic Modem
Chapter 3 - Data Interfaces
3.1 Electrical Data Interfaces
A variety of interfaces are available with the 2270 Modem. Each is designed to conform with
existing standards. Refer to Section 7, Specifications, for applicable configurations, standards
and physical connector types.
PHOTO
Figure 3-1.
2270
Interchangeable
Interfaces
3.2 RS-232C/423 Interface Model -32
This interface is electrically compatible with EIA RS-423A. It will also operate with RS-232C
systems when adhering to the more limiting RS-232C specifications (50-foot distance and
20-kbps data rate). EIA standard RS-423 does not reference physical connector type or pinouts.
This RS-423 interface uses the physical connector type and pinouts specified in RS-232C (refer to
Table 3-A).
The RS-232C/423 interface uses a 25-pin female D-type connector for the physical connection.
NOTE: The control leads support only a local handshake.
3.3 RS-449/422 Interfaces
The RS-449/422 interface is available in several models to suit a wide range of user requirements.
Table 3-B lists the standard models.
This interface is compatible with EIA Standard RS-449. It uses a standard 37-position, female
D-type connector (DC-37). Pin assignments for each of the models are outlined in Table 3-C.
Only a local handshake is supported for the control leads. The maximum data rate specified is
10 Mbps.