DS2148 データシートの表示（PDF） - Maxim Integrated

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DS2148

5V E1/T1/J1 Line Interface Unit

Maxim Integrated 

DS2148/DS21Q48

Table 2-8. Loopback Control in Hardware Mode

LOOPBACK

SYMBOL CONTROL BIT

Remote Loopback

RLB

CCR6.6

Local Loopback

LLB

CCR6.7

Analog Loopback

No Loopback

ALB

–

CCR6.4

–

LOOP1

1

1

0

0

LOOP0

1

0

1

0

Table 2-9. Transmit Data Control in Hardware Mode

TRANSMIT DATA

SYMBOL

CONTROL

BIT

TX1

TX0

Transmit Unframed All Ones

TUA1

CCR3.7

1

1

Transmit Alternating Ones and Zeros

TAOZ

CCR3.5

1

0

Transmit PRBS

TPRBSE

CCR3.4

0

1

TPOS and TNEG

–

–

0

0

Table 2-10. Receive Sensitivity Settings

EGL

(CCR4.4)

ETS

(CCR1.7)

0

0 (E1)

1

0 (E1)

1

1 (T1)

0

1 (T1)

RECEIVE SENSITIVITY

-12dB (short haul)

-43dB (long haul)

-30dB (limited long haul)

-36dB (long haul)

Table 2-11. Monitor Gain Settings

MM1

MM0

INTERNAL LINEAR

(CCR5.5) (CCR5.4)

GAIN BOOST (dB)

0

0

Normal operation (no boost)

0

1

20

1

0

26

1

1

32

Table 2-12. Internal Rx Termination Select

RT1

RT0

INTERNAL RECEIVE

(CCR5.1) (CCR5.0) TERMINATION CONFIGURATION

0

0

Internal receive-side termination disabled

0

1

Internal receive-side 120Ω enabled

1

0

Internal receive-side 100Ω enabled

1

1

Internal receive-side 75Ω enabled

Table 2-13. MCLK Selection

MCLK

JAMUX

(CCR1.3)

ETS

(CCR1.7)

2.048MHz

0

0

2.048MHz

1

1

1.544MHz

0

1

20 of 73

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