### Rear Panel Connectors

The rear panel
of the analyzer provides various connectors for external devices and control signals.

### AUX

Coaxial bidirectional auxiliary connector that can be wired as needed. The AUX connector is not fitted on standard instruments.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
Center conductor | AUX | I or O or B | See data sheet | Can be wired as needed
Outer conductor | GNDA | – | 0 V | Analog ground

### LAN1 / LAN 2

8-pin connector RJ-45 used to connect the analyzer to a Local Area Network (LAN). The pin assignment of the RF-45 connector supports category 5 UTP/STP (Unshielded/Shielded Twisted Pair) cables.

Pin No. | Name | Input (I) or Output (O) | Voltage Range
1 | INPUT RECEIVE DATA (+) | I | +2.5 V
2 | INPUT RECEIVE DATA (–) | I | –2.5 V
3 | OUTPUT TRANSMIT DATA (+) | O | +2.5 V
6 | OUTPUT TRANSMIT DATA (–) | O | –2.5 V

The other pins are not used.

### USB

Double Universal Serial Bus connector of type A (master USB), used to connect e.g a keyboard, mouse or other pointing devices, the Calibration Unit
(accessory R&S ZV-Z51/-Z52 or R&S ZV-Z58), a printer or an external storage device (USB stick, CD-ROM drive etc.).

The length of passive connecting USB cables should not exceed 1 m. The maximum current per USB port is 500 mA.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
1 | +5.2VD | – | +5.2V | Supply voltage (rt)
2 | USBD0M | B | TTL | Data D– (ws)
3 | USVD0P | B |  | Data D+ (gn)
4 | GNDD | – | 0 V | Digital ground (sw)
5 | +5.2VD | – | +5.2V | Supply voltage (rt)
6 | USBD1M | B | TTL | Data D– (ws)
7 | USBD1P | B |  | Data D+ (gn)
8 | GNDD | – | 0 V | Digital ground (sw)

### 10 MHz REF

Coaxial BNC connector used as an input or output for the 10 MHz reference clock signal.

The function of the 10 MHz REF connector depends on the Int. Reference
or Ext. Reference
setting in the System menu:

- If Int. Reference is active, 10 MHz REF is used as an output connector for the 10 MHz internal reference clock signal of the analyzer.

- If Ext. Reference is active, 10 MHz REF is used as an input connector for an external 10 MHz reference clock signal. The external reference signal must meet the specifications of the data sheet. The internal reference signal is synchronized to the external signal.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
Center conductor | FR_REF_10_OUT/IN | B | See data sheet | Reference frequency
Outer conductor | GNDA | – | 0 V | Analog ground

### DC MEAS

Two inputs for DC measurements
. The connectors are of the same type but specified for different input voltage ranges, see data sheet.

Pin No. | Name | Input (I) or Output (O) | Function
3 | GNDA | - | Analog ground
5 | GNDA | - | Analog ground
6 | DCMEAS1VPOS DCMEAS10VPOS | I | Positive 1 V or 10 V DC input (see data sheet)
8 | DCMEAS1VNEG DCMEAS10VNEG | I | Positive 1 V or 10 V DC input (see data sheet)

### PORT BIAS

Coaxial BNC connectors used to apply an external DC voltage (bias) to the test ports
. The PORT BIAS connectors are numbered 1 to 4 (for four-port analyzers).

Each PORT BIAS input is protected by an exchangeable fuse
.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
Center conductor | PORTBIAS1/2/3/4 | I | See data sheet | DC input for test port 1/2/3/4
Outer conductor | GNDA | – | 0 V | Analog ground

### MONITOR

15-pole Sub-Min-D connector used to connect and external VGA monitor.

Pin No. | Name | Input (I) or Output (O) | Voltage Range | Function
1 | RED | O | 75 W shielded | Red signal
2 | GREEN | O | 75 W shielded | Green signal
3 | BLUE | O | 75 W shielded | Blue signal
4 | NC | – | – | –
5 | GNDA | – | 0 V | Analog ground
6 | GNDA | – | 0 V | Analog ground
7 | GNDA | – | 0 V | Analog ground
8 | GNDA | – | 0 V | Analog ground
9 | GNDA | – | 0 V | Analog ground
10 | GNDA | – | 0 V | Analog ground
11 | NC | – | – | –
12 | DDCDAT |  |  |
13 |  |  |  |
14 |  |  |  |
15 |  |  |  |

### CASCADE

8-pin RJ-45 connectors for future extensions.

### USER CONTROL

25-pole D-Sub connector used as an input and output for low-voltage (3.3 V) TTL control signals. Some of the USER CONTROL lines can be controlled via GPIB bus (see CONTrol...
and OUTPut...
subsystems).

Pin No. | Name | Input (I) or Output (O) | Function
1 | GNDD | - | Digital ground
2 | EXT TRG | I | External trigger signal *)
3 | GNDD | - | Digital ground
4 | BUSY | O | Measurement running
5 | GNDD | - | Digital ground
6 | READY FOR TRIGGER | O | Measurement terminated, r eady for trigger
7 | GNDD | - | Digital ground
8 | CHANNEL BIT 0 | O | Channel-specific bit 0; see CONTrol:AUXiliary:C[:DATA] and OUTPut<Ch>:UPORt[:VALue]
9 | CHANNEL BIT 1 | O | Channel-specific bit 1
10 | CHANNEL BIT 2 | O | Channel-specific bit 2
11 | CHANNEL BIT 3 | O | Channel-specific bit 3
12 | GNDD | - | Digital ground
13 | PASS 1 | O | Pass/fail result of limit check TTL Out Pass 1
14 | PASS 2 | O | Pass/fail result of limit check TTL Out Pass 2
15 | GNDD | - | Digital ground
16 | DRIVE PORT 1 | O | Test port 1 is source port (drive port)
17 | DRIVE PORT 2 | O | Test port 2 is source port (drive port)
18 | DRIVE PORT 3 | O | Test port 3 is source port (drive port)
19 | DRIVE PORT 4 | O | Test port 4 is source port (drive port)
20 | GNDD | - | Digital ground
21 | EXT GEN TRG | O | Control signal for external generator
22 | EXT GEN BLANK | I | Handshake signal from external generator
23 | GNDD | - | Digital ground
24 | FOOT SWITCH 1 | I | Control input A
25 | FOOT SWITCH 2 | I | Control input B

*) Note: Feeding in the external trigger signal via the BNC connector EXT TRIGGER
is equivalent.
Both input connectors must not be used simultaneously, because this can cause malfunctions of the analyzer.

| Important note: Use only well shielded cables or disconnect the input pins of the USER CONTROL connector in order to avoid spurious input signals which may cause undesirable events. This is of particular importance for the external trigger input (pin no. 2) if the EXT TRIGGER input is used.

### EXT TRIGGER

Coaxial BNC connector used as an input for a low-voltage (3.3 V) TTL external trigger signal.

*) Note: Feeding in the external trigger signal at pin 2 of the D-Sub connector USER CONTROL
is equivalent. Both input connectors must not be used simultaneously, because this can cause malfunctions of the analyzer.

Pin No. | Name | Input (I) or Output (O) or Bidirectional (B) | Voltage Range | Function
Center conductor | RP_EXT_TRG | I | 3.3 V TTL | External trigger signal
Outer conductor | GNDA | – | 0 V | Analog ground