AK2504A Datasheet, PDF (17/30 Pages) List of Unclassifed Manufacturers – DS3/STS-1/ES Transceiver

ASAHI KASEI
[AK2504A]
Loopback
AK2504A has two loopback modes, which are Remote Loopback mode and Local Loopback mode.
Each function of those is shown in Table 12 and Fig. 8.
Table 12 Loopback Function
Mode
Remote
Local
RLOOP
1
0
LLOOP
0
1
RPDATA
RNDATA
TPDATA
TNDATA
TCLK
TTIP
TRING
RPDATA
RNDATA
RCLK
Function
Transmit rate is determined by RCLK.
TPDATA/TNDATA are ignored.
Transmit rate is determined by TCLK.
TPDATA/TNDATA are ignored.
1
1 Not permitted that both RLOOP and LLOOP are high.
Remote
LoopBack
RLOOP=1
LLOOP=0
TPDATA
TNDATA
TCLK
RPDATA
RNDATA/BPV
RCLK
B3ZS/HDB3
ENCODER
LOOP BACK
MUX
PULSE SHAPER
OUTPUT DRIVER
B3ZS/HDB3
ENCODER
CLOCK&DATA
RECOVERY
TTIP
TRING
RTIP
RRING
Local
LoopBack
RLOOP=0
LLOOP=1
TPDATA
TNDATA
TCLK
RPDATA
RNDATA/BPV
RCLK
RLOOP LLOOP
B3ZS/HDB3
ENCODER
LOOP BACK
MUX
PULSE SHAPER
OUTPUT DRIVER
B3ZS/HDB3
ENCODER
CLOCK&DATA
RECOVERY
TTIP
TRING
RTIP
RRING
RLOOP LLOOP
Fig. 8 Loopback Path
MS0143-E-01
- 17 -
2004/01