Rainbow Electronics DS26519 - Manual (Page 104)

DS26519 16-Port T1/E1/J1 Transceiver
104 of 310
9.12.6.2 Local Loopback
The transmit system data is looped back to the receive framer. This data is also encoded and output on TTIPn and
TRINGn. Signals at RTIPn and RRINGn are ignored. This loopback is conceptually shown in
Figure 9-29 .
Figure 9-29. Local Loopback
Line
Driver
Transmit
Framer
Optional
Jitter
Attenuator
Transmit
Digital Transmit
Analog
TCLK
TSER
Receive
Framer
Optional
Jitter
Attenuator
Receive
Digital Receive
Analog
RCLK
RSER
RTIP
RRING
TTIP
TRING
9.12.6.3 Remote Loopback 1
The outputs decoded from the receive LIU are looped back to the transmit LIU, not including the jitter attenuator in
the path. Remote Loopback 2 includes the jitter attenuator in the loopback path. The inputs from the transmit
framer are ignored during Remote Loopback 1.
9.12.6.4 Remote Loopback 2
The outputs decoded from the receive LIU are looped back to the transmit LIU, including the jitter attenuator. The
inputs from the transmit framer are ignored during Remote Loopback 2. This loopback is conceptually shown in
Figure 9-30 .
Figure 9-30. Remote Loopback 2
Line
Driver
Transmit
Framer
Optional
Jitter
Attenuator
Transmit
Digital Transmit
Analog
TCLK
TSER
Receive
Framer
Optional
Jitter
Attenuator
Receive
Digital Receive
Analog
RCLK
RSER
RTIP
RRING
TTIP
TRING