AT&T 3551 Switch User Manual


 
COMSPHERE 3550 Series Data Service Units
5-16 February 1995 3550-A2-GB20-10
Table 5-7
External DBU Configuration Options
ExtBU: None
Next Ansr Orig None Prev
External Backup Unit
. This feature allows dial backup for a DSU using an
external
dial backup unit (DBU).
Ansr Select for the
external
DBU to answer an incoming dial backup call.
Orig Select for the
external
DBU to originate dial backup. Only when the
external
DBU is set to Orig will the
Backup option set be available. The
external
DBU must be set for Dial on DTR.
None Select to disable the
external
DBU. This is the default setting.
Rate(Kbps): 9.6
Next 64 56 38.4 28.8 19.2 14.4 9.6 4.8 2.4 1.2 Disab Prev
Backup Rate for the External Dial Unit (DBU)
.
64 to Select the data rate to match the
external
DBU’s port speed.
1.2 kbps
TxClkSource: DCE
Next DCE Prt1 Prt2 Prev
Transmit Clock Source
. Specifies the transmit timing source for the
external
DBU.
DCE Select if clock is provided by the
external
DBU.
Prt1 or Select the port that timing is to be taken from, using the selected port’s external Transmit
Prt2 Timing lead
(Prt2 is only displayed if a TDM/Flex is installed and enabled).