The external power connector is used to power the unit and for battery charging. Input is 12 VDC to 15 VDC at up to 5.0 A. A green flashing indicator light near the power switch shows that the instrument battery is being charged by the external charging unit. The indicator is steadily illuminated when the battery is fully charged.
Warning
When using the AC‑DC Adapter, always use a three‑wire power cable that is connected to a three‑wire power line outlet. If power is supplied without grounding the equipment in this manner, then the user is at risk of receiving a severe or fatal electric shock.
LAN Connection
The RJ‑45 connector is used to connect the BTS Master to a local area network. Integrated into this connector are two LEDs. The amber LED shows the presence of a 10 Mbit/s LAN connection when on, and a 100 Mbit/s LAN connection when off. The green LED flashes to show that LAN traffic is present. For additional information about the LAN connection, Ethernet connection, and DHCP, refer to Ethernet Configuration.
USB Interface – Type Mini‑B
The USB 2.0 interface can be used to connect the MT8221B BTS Master directly to a PC. The first time the MT8221B is connected to a PC, the normal USB device detection by the computer operating system will take place. The CD‑ROM that shipped with the instrument contains a driver for Windows XP that is installed when Master Software Tools is installed. Drivers are not available for earlier versions of the Windows operating system. During the driver installation process, place the CD‑ROM in the computer drive and specify that the installation wizard should search the CD‑ROM for the driver.
Note
For proper detection, Master Software Tools should be installed on the PC prior to connecting the BTS Master to the USB port.
USB Interface – Type A
The MT8221B BTS Master can also be a USB Host and allow various USB Flash Memory devices to be connected to the instrument for storing measurements, setups, and files.
Headset Jack
The headset jack provides audio output from the built‑in AM/FM/SSB demodulator for testing and troubleshooting wireless communication systems. The jack accepts a 2.5 mm 3‑wire miniature phone plug such as those commonly used with cellular telephones.
Ext Trigger In
A TTL signal that is applied to the External Trigger female BNC input connector causes a single sweep to occur. In the Spectrum Analyzer mode, it is used in zero span, and triggering occurs on the rising edge of the signal. After the sweep is complete, the resultant trace is displayed until the next trigger signal arrives. This port is also used for External Clock Recovery in T1/T3/E1 operations (described in the Backhaul Measurement Guide). Refer to Measurement Guides for reference to the Backhaul Measurement Guide, which also can be found on the documentation disc.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
IF Out 140 MHz
BNC connector for Zero Span IF Output.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
SPA RF In and VNA Port 2
50 Ω Type‑N female connector.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑N connector. Do not overtighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
Ref Out 10 MHz
10 MHz Reference Out, BNC, female 50 Ω.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
RF Output and VNA Port 1
RF output, 50 Ω impedance, for reflection measurements. Max input is +23 dBm at ±50 VDC.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑N connector. Do not overtighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
RF In
50 Ω Type‑N female connector.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the Type‑N connector. Do not overtighten the connector. The recommended torque is 12 lbf · in to 15 lbf · in (1.36 N · m to 1.70 N · m).
E1, Rx, Tx Connectors
Female BNC connectors for transmit and receive.
To prevent damage to your instrument, do not use pliers or a wrench to tighten the BNC connector. Do not overtighten the connector.
T1, T3, Rx, Tx Connector
BERT tester (Option 51 and Option 53) Bantam jacks for transmit and receive.
GPS Antenna Connector
The GPS antenna connection on the BTS Master is type SMA.
To prevent damage to your instrument, do not use pliers or a plain wrench to tighten the SMA connector. Do not overtighten the connector. The recommended torque is 8 lbf · in (0.9 N · m or 90 N · cm).
