IBM3009K2672
IBM SONET/SDH Framer
9.6: GLoopTx2 [385C H]
Transmit loopback stage 2 control. When this loopback is enabled, cells/chunks that are put into the transmit
ACB are looped back towards their corresponding receive ACB after the TCSF or PPP processing functions
are performed. 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/frames to be transmitted towards the SONET/SDH line in addition to
being looped back towards the receive APH blocks. Loopback-only mode disables cells/frames from being
transmitted out to the SONET/SDH line; only the loopback function is performed. Refer to Loopback Capabil-
ities on page 131.
For bit positions 3 to 0: 0: ACH Loopback #2 disabled (DEFAULT)
1: ACH Loopback #2 enabled
For bit positions 7 to 4: 0:On-the-fly monitoring (LpB #2)
1: Loopback #2 only
Signal Name
Bits
Access
Default
Description
Loopback #2 control, transmit macro #1
TxLpB21
TxLpB22
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 #2 control, transmit macro #2
Loopback #2 control, transmit macro #3
Loopback #2 control, transmit macro #4
Loopback #2 only, transmit macro #1
Loopback #2 only, transmit macro #2
Loopback #2 only, transmit macro #3
Loopback #2 only, transmit macro #4
TxLpB23
TxLpB24
TxLpB21only
TxLpB22only
TxLpB23only
TxLpB24only
ssframer.01
8/27/99
Register Descriptions
Page 133 of 279
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