BT8954 CONEXANT [Conexant Systems, Inc], BT8954 Datasheet - Page 38

• Manufacturer Part Number: BT8954
• Description: VOICE PAIR GAIN FRAMER
• Manufacturer: CONEXANT [Conexant Systems, Inc]

3.0 Circuit Descriptions
3.6 Loopbacks
Figure 3-14. PCM and DSL Loopbacks
Table 3-4. PCM and DSL Loopbacks
3-16
Loopback
DD_LOOP
PP_LOOP
DP_LOOP
PD_LOOP
RDAT
TDAT
Command Register
RCMD_2; 0x91
TCMD_2; 0x87
DD_LOOP
CMD_1; 0xC0
CMD_1; 0xC0
DSL Channel
3.6 Loopbacks
Bt8954 provides multiple PCM and DSL loopbacks as illustrated in
The output towards which data is looped is called the test direction. Loopback
activation in the test direction does not disrupt the through-data path in the
non-test direction.
initials corresponding to test direction and the channel from which data is looped.
PD_LOOP
Test Direction
Transmit
Transmit
Receive
Receive
Table 3-4
Conexant
lists the loopback controls which are designated by
PCM Loopback on PCM Side
DSL Loopback on PCM Side
PCM Loopback on DSL Channel
DSL Loopback on DSL Channel
DP_LOOP
PCM Channel
Loopback Description
PP_LOOP
Voice Pair Gain Framer
Figure
N8954DSC
PCMR
PCMT
Bt8954
3-14.