Premisys 600, Reference Manual

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Server Cards 4-5
ATM Card ACS-ATM Card User Screens and Settings
LB CFG (DS3)
The Loopback Configuration setting shows the loopback status of the local interface. The off
state indicates that no loopback is present. The local state shows that the transmitted signal at
the interface is looped back to the receiver. The line state shows that the received signal is
looped back to the sender before this interface. The payld (payload) state indicates that the
received signal is looped back after passing through the ports reframing function. The cell
state indicates that the received cells are looped back to the transmit FIFO for retransmission
before passing through the receive FIFO. The payld and cell are ONLY used for DS3.
LB GEN (DS3)
The Loopback Generate setting indicates the type of loopback command to be sent to the
remote system. The off setting tells the remote system that the transmitted signal is either
looped or normal data. The line setting sends a request to the remote system for a local
loopback (see above). The payld setting sends a request for a payload loopback. The reset
setting tells the remote system to deactivate loopbacks. The test setting sends a test pattern to
the remote system. This pattern will be a user-generated cell running AAL0 through ALC on
a specific VCI.
LB DET (DS3)
The Loopback Detect setting tells the system to either detect or ignore remote loopback
requests. The off option tells the system to ignore remote loopback requests. The on option
tells the system to detect remote loopback commands. The system then loops data back in the
format specified until the remote equipment releases the loopback. The w/to (with timeout)
setting is the same as the on setting, but after 10 minutes the loopback is automatically
released.
TX CLKSRC (DS3)
The Transmit Clock Source setting allows you to indicate the source of the transmit clock. The
options are line (source is the DS3 receive line rate) and plcp (source is the PLCP frame
receive rate). The last setting is valid only if Cell Framing is set to plcp (see above).
Note: An Interface Card is required to derive timing from the DS3 line.
TX-RX SCRAM (DS3)
The Transmit-Receive Scramble setting will show if the transmitted and received data is
scrambled to maintain minimum-ones density. The options are yes and no.