User's Manual

Required Test Equipment – continued

May 2000

1-7

SC 4812T CDMA BTS Optimization/ATP

10BaseT/10Base2 Converter

 Transition Engineering Model E–CX–TBT–03 10BaseT/10Base2

Converter

– or –

 Transition Engineering Model E–CX–TBT–03 10BaseT/10Base2

Converter

Xircom Model PE3–10B2 or equivalent can also be used to

interface the LMF Ethernet connection to the frame.

NOTE

3C–PC–COMBO CBL

 Connects to the 3COM PCMCIA card and eliminates the need for a

10BaseT/10base2 Converter.

RS–232 to GPIB Interface

 National Instruments GPIB–232–CT with Motorola CGDSEDN04X

RS232 serial null modem cable or equivalent; used to interface the

LMF to the test equipment.

 Standard RS–232 cable can be used with the following modifications

(see Figure 1-1):

– This solution passes only the 3 minimum electrical connections

between the LMF and the GPIB interface. The control signals are

jumpered as enabled on both ends of the RS–232 cable (9–pin D).

TX and RX signals are crossed as Null Modem effect. Pin 5 is the

ground reference.

– Short pins 7 and 8 together, and short pins 1, 4, and 6 together on

each connector.

Figure 1-1: Null Modem Cable Detail

GND

RTS

CTS

RSD/DCD

DTR

GND

RTS

CTS

RSD/DCD

DTR

ON BOTH CONNECTORS

SHORT PINS 7, 8;

SHORT PINS 1, 4, & 6

9–PIN D–FEMALE 9–PIN D–FEMALE

DSR

FW00362

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