IBM3009K2672
IBM SONET/SDH Framer
9.5: GLoopTx1 [385B H]
Transmit loopback stage 1 control. When this loopback is enabled, cells/chunks that are put into the transmit
ACB are looped back to their corresponding receive ACB without TCSF processing. Bit positions 7-4 set the
mode of the respective loopback to on-the-fly monitoring or loopback- only. On-the-fly monitoring allows
cells/chunks to be forwarded to the SONET/SDH line after TCSF processing has been performed, while
cells/chunks are internally looped back before TCSF processing is performed. Loopback-only mode disables
cells/chunks from being transmitted out to the SONET/SDH line; only the loopback function is performed.
Refer to Loopback Capabilities on page 131.
For bit positions 3 to 0: 0: ACH Loopback #1 disabled (DEFAULT)
1: ACH Loopback #1 enabled
For bit positions 7 to 4: 0: On-the-fly monitoring (LpB #1)
1: Loopback #1 only
Signal Name
Bit
Access
Default
Description
Loopback #1 control, transmit macro #1
TxLpB11
TxLpB12
0
1
2
3
4
5
6
7
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
0
0
0
0
0
0
0
0
Loopback #1 control, transmit macro #2
Loopback #1 control, transmit macro #3
Loopback #1 control, transmit macro #4
Loopback #1 only, transmit macro #1
Loopback #1 only, transmit macro #2
Loopback #1 only, transmit macro #3
Loopback #1 only, transmit macro #4
TxLpB13
TxLpB14
TxLpB11only
TxLpB12only
TxLpB13only
TxLpB14only
Register Descriptions
Page 132 of 279
ssframer.01
8/27/99
IBM [ IBM ]
