Rainbow Electronics DS26519 - Manual (Page 83)

DS26519 16-Port T1/E1/J1 Transceiver
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9.9.17 Framer Payload Loopbacks
The framer, payload, and remote loopbacks are controlled by RCR3 .
Table 9-35. Register Related to Framer Payload Loopbacks
RECEIVE CONTROL
REGISTER 3 (
RCR3 )
FRAMER 1
ADDRESSES
FUNCTION
Framer Loopback 083h Transmit data output from the framer is looped back to the receiver.
Payload Loopback 083h The 192-bit payload data is looped back to the transmitter.
Remote Loopback 083h Data recovered by the receiver is looped back to the transmitter.
Note: The addresses shown above are for Framer 1.