 | Article ID: 1601 |
| Q&A | |
DSU IV ESP Interface Pinouts
Q:
DSU IV ESP Interface Pinouts
A:
The following charts give the pin assignments for the DSU IV ESP interfaces. They can also be found in the DSU IV ESP User Manual.
Pin Assignments for Telco Connector
| Pin | Name | Description |
|---|---|---|
| 1 | R1 | Transmit Data from DSU to Network-Ring 1 |
| 2 | T1 | Transmit Data from DSU to Network-Tip 1 |
| 3-6 | - | Not Used |
| 7 | T | Receive Data from Network to DSU-Tip |
| 8 | R | Receive Data from Network to DSU-Ring |
Pin Assignments for ESP DBU Card Connectors
| Pin | Name | Description |
|---|---|---|
| 4-wire Switched 56 | ||
| 1 | R1 | Transmit Data from DSU to Network-Ring 1 |
| 2 | T1 | Transmit Data from DSU to Network-Tip 1 |
| 3-6 | - | Not Used |
| 7 | T | Receive Data from Network to DSU-Tip |
| 8 | R | Receive Data from Network to DSU-Ring |
| V.34 and 1B+D ISDN | ||
| 1-3 | - | Not Used |
| 4 | T | Network-Tip |
| 5 | R | Network-Ring |
| 6-8 | - | Not Used |
DTE Pin Assignments
The DTE should be connected to either the EIA-232 DTE connector or the CCITT V.35 DTE connector. The maximum cable lengths recommended are 50 feet for the EIA-232, and 100 feet for the CCITT V.35.
The V.35 connector is recommended for use with data rates above 19.2 kbps. The EIA-232 connector works up to 56 kbps with a low capacitance cable or with the external transmit clock option selected. The DTE rate is configured from the front panel. The DTE can operate in asynchronous or synchronous modes.
To prevent possible radio frequency interference emissions, a shielded cable is required.
Pin Assignments for EIA-232 Connector
| Pin | EIA | Description |
|---|---|---|
| 1 | AA | Protective Ground (PG) |
| 2 | BA | Transmit Data (SD) |
| 3 | BB | Receive Data (RD) |
| 4 | CA | Request to Send (RS) |
| 5 | CB | Clear to Send (CS) |
| 6 | CC | Data Set Ready (SR) |
| 7 | AB | Signal Ground (SG) |
| 8 | CF | Received Line Signal Detector (CD) |
| 9 | - | +12 Test Point |
| 10 | - | -12 Test Point |
| 15 | DB | Transmit Clock (TC) |
| 17 | DD | Receive Clock (CR) |
| 18 | - | Local Looback (LL) |
| 20 | CD | Data Terminal Ready (TR) |
| 21 | - | Remote Looback (RL) |
| 22 | CE | Ring Indicator (RI) |
| 24 | DA | External TX Clock (ETC) |
| 25 | - | Test Indicator (TI) |
Pin Assignments for V.35 Connector
| Pin | CCITT | Description |
|---|---|---|
| A | 101 | Protective Ground (PG) |
| B | 102 | Signal Ground (SG) |
| C | 105 | Request to Send (RTS) |
| D | 106 | Clear to Send (CTS) |
| E | 107 | Data Set Ready |
| F | 109 | Received Line Signal Detector (CD) |
| H | - | Data Terminal Ready (DTR) |
| J | - | Ring Indicate (RI) |
| L | - | Local Loopback (LL) |
| N | - | Remote Loopback (RL) |
| R | 104 | Receive Data (RD-A) |
| T | 104 | Receive Data (RD-B) |
| V | 115 | Receiver Signal Element Timing (SCR-A) |
| X | 115 | Receiver Signal Element Timing (SCR-B) |
| P | 103 | Transmitted Data (SD-A) |
| S | 103 | Transmitted Data (SD-B) |
| Y | 114 | Transmitter Signal Element Timing (SCT-A) |
| AA | 114 | Transmitter Signal Element Timing (SCT-B) |
| U | 113 | External TX Signal Element (SCX-A) |
| W | 113 | External TX Signal Element (SCX-B) |
| NN | - | Test Indicator (TI) |
Pin Assignments for Control Connector
| RJ Pin# | Function | Direction |
|---|---|---|
| 1 | GND | |
| 2 | RTS | I |
| 3 | TD | I |
| 4 | DSR | O |
| 5 | RD | O |
| 6 | CTS* | O |
| 7 | - | Not Used |
| 8 | - | Not Used |
| *Used for hardware flow control. | ||
Pin Assignments for 10BaseT Connector
| Pin | Name | Description |
|---|---|---|
| 1 | TD+ | The positive signal for the TD differential pair. This signal contains the serial output data stream transmitted onto the network. |
| 2 | TD- | The negative signal for the TD differential pair (pins 1 and 2). |
| 3 | RD+ | The positive signal for the RD differential pair. This signal contains the serial input data stream received from the network. |
| 4, 5 | N/A | Not Used |
| 6 | RD- | The negative signal for the RD differential pair (pins 3 and 6). |
| 7, 8 | N/A | Not Used |
