Configuration Option Tables
A-5
7112-A2-GB20-20 March 1998

Table A-2. Network Interface Options (3 of 4)

FDL Subnet Mask
Possible Settings: 000.000.000.000 – 255.255.255.255, Clear
Default Setting: 000.000.000.000
Specifies the subnet mask used to access the unit via the FDL interface.
000.000.000.000 – 255.255.255.255 – Set the FDL interface subnet mask. The range
for each byte is 000 to 255.
Clear – Clears the FDL Subnet Mask and sets to all zeros. When the subnet mask is all
zeros, the device creates a default subnet mask based on the class of IP address:
– Class A defaults to 255.000.000.000
– Class B defaults to 255.255.000.000
– Class C defaults to 255.255.255.000
Network Initiated Line Loopback (LLB)
Possible Settings: Enable, Disable
Default Setting: Enable
Allows initiation and termination of the LLB to be controlled by the receipt of
LLB-actuate and LLB-release commands from the network (or remote DSU/CSU).
Enable – Causes the DSU/CSU to enter an LLB (if the DSU/CSU can perform an LLB
in its current state) and to cause an LLB-release command to terminate the LLB.
Disable – Causes the DSU/CSU to ignore LLB-actuate and LLB-release commands
(the DSU/CSU is not in compliance with ANSI T1.403 and AT&T TR 62411).
NOTE: If this configuration option is enabled, the DSU/CSU recognizes the in-band
LLB-actuate and LLB-release codes specified by AT&T as well as the
bit-oriented FDL messages specified by ANSI (for ESF only).
Network Initiated Payload Loopback (PLB)
Possible Settings: Enable, Disable
Default Setting: Enable
Allows initiation and termination of the PLB to be controlled by the receipt of
PLB-actuate and PLB-release commands from the network (or remote DSU/CSU).
Enable – Causes the DSU/CSU to enter a PLB (if the DSU/CSU can perform a PLB in
its current state) and to cause a PLB-release command to terminate the PLB.
Disable – Causes the DSU/CSU to ignore PLB-actuate and PLB-release commands
(the DSU/CSU is not in compliance with ANSI T1.403 and AT&T TR 54016).
NOTES: – If this configuration option is enabled, the DSU/CSU recognizes the
in-band PLB-actuate and PLB-release codes specified by AT&T as well
as the bit-oriented FDL messages specified by ANSI.
– This configuration option is only available if the network interface
framing is set to ESF.