Datasheet

DS21348/DS21Q348
21 of 76
Table 2-8. Loopback Control in Hardware Mode
LOOPBACK SYMBOL
CONTROL
BIT
LOOP1 LOOP0
Remote Loopback RLB CCR6.6 1 1
Local Loopback LLB CCR6.7 1 0
Analog Loopback ALB CCR6.4 0 1
No Loopback — — 0 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)
RECEIVE SENSITIVITY
0 0 (E1) -12dB (short haul)
1 0 (E1) -43dB (long haul)
1 1 (T1) -30dB (limited long haul)
0 1 (T1) -36dB (long haul)
Table 2-11. Monitor Gain Settings
MM1
(CCR5.5)
MM0
(CCR5.4)
INTERNAL LINEAR
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
(CCR5.1)
RT0
(CCR5.0)
INTERNAL RECEIVE
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