tive and is wired for a two-wire interface. The signal/pin relationships are shown in Figure 4.
Figure 4. Model 1052 twisted pair line interface
4.2CONNECTING THE CONNECTING THE MODEL 1052/A (RS-232)
The Model 1052/A supports RS-232 serial port connections. This section describes how to connect the serial ports to your RS-232 equipment.
Connecting the Model 1052/A (RS-232) to a DTE Device
The Model 1052/A provides an RS-232 DCE (data communications equipment) interface on a DB-25 female connector. As a DCE, this inter- face is designed to connect to DTE equipment, such as a router. When connecting the RS-232 interface of the Model 1052/A to your DTE device, use an RS-232 straight-through cable (see Figure 5). Appendix C on page 19 describes pin assignments and signal sources for the Model 1052/A RS-232 interface. When purchasing or constructing an interface cable, use the pin diagrams in Appendix C as a guide.
Model 1052
Model 1052/A
iDSL Modem With
RS-232 Interface
TM | ER | NS | DSL | RXD | TXD |
| | | LINK | | |
| Interface 232-RS | |
| With Modem iDSL | |
| 1052/A Model | | |
| Maryland Gaithersburg, | |
DSL Span
Straight-through 25-pin
D-sub cable
Model 1052 (DCE)
Figure 5. Connecting the Model 1052/A to an RS-232 serial DTE
4.3 POWER CONNECTION
The Model 1052 (all versions) are available with Universal AC (100–240 VAC), 120 VAC, 230 VAC or -12, -24, or -48 VDC power options. This section describes these options.
