Octal E1 Line Interface — LXT381

Datasheet

25

The Analog Test Port can be used to verify continuity across the coupling transformer’s primary

winding. By applying a stimulus to the AT1 input, a known voltage will appear at AT2 for a given

load. This, in effect, tests the continuity of a receive or transmit interface. See Figure 8.

3.3.5

Instruction Register (IR)

The IR is a 3 bit shift register that loads the instruction to be performed. The instructions are shifted

LSB first. Table 7 shows the valid instruction codes and the corresponding instruction description.

11001

TTIP6

TRING6

11000

RTIP7

RRING7

10111

RTIP0

RRING0

10110

RTIP1

RRING1

10101

RTIP2

RRING2

10100

RTIP3

RRING3

10011

RTIP4

RRING4

10010

RTIP5

RRING5

10001

RTIP6

RRING6

10000

RTIP7

RRING7

Table 6.

Analog Port Scan Register (ASR) (Continued)

ASR Control Code

AT1 Forces Voltage To:

AT2 Senses Voltage From: