Verilink PRISM 4001 (34-00244) Product Manual - Manual (Page 31)

Terminal Operation 4-11 PRISM 4001
Dial Backup Parameters Screen
This 4001 can provide an alternate data path when the DDS
network connection fails. This alternate data path is estab-
lished across a switched circuit such as PSTN or ISDN. Dial
Backup (Figure 4-15) handles the functions described in the
following paragraphs.
DBU S TATUS
Shows the current state on the left and the programming
choices on the right in enclosed brackets. The possible val-
ues are DISABLED, DISALLOWED, ENABLED, CON-
NECTING, DIALING, ANSWERING, and ACTIVE.
DISABLED: DBU has been disallowed by the user via the
DBU command field.
ENABLED: DBU is allowed, but is not immediately
needed.
CONNECTING: Establishment of the DBU is in progress.
DIALING: Establishment of the DBU is in progress.
ANSWERING: The unit is waiting for the other end to call it.
ACTIVE: DBU is active.
DBU COMMAND
Used to control DBU operations. The choices are DIS-
ABLE, ENABLE, and ACTIVATE.
DBU A CTIVATOR
Used to select the criteria that the 4001 uses to activate the
dial backup sequence. The choices for dial backup activa-
tion are the LOS, OOS, OOF, or ANY one of these alarm
thresholds.
DBU F ORMAT
Used to set the data format used between the 4001 and the
DBU device, after connection is established. Connection is
always done in ASYNC format. The SYNC format is to be
used with ISDN terminal adapters at 56K, 64K, or synchro-
nous modems.
DBU R ATE
Used to select a dial backup rate of 2.4, 4.8, 9.6, 19.2, 38.4,
or 57.6 kbps. The usable rates depend on the type of modem
used or if a terminal adapter is used.
DBU M ODE
Used to select the CSU/DSU’s call response mode. If
ORIGINATE is selected, the CSU/DSU initiates a call when
needed. If set to ANSWER, it only answers an incoming
call. If set to CALLBACK ORIGINATE, it calls the pre-
defined number, issues a password, hangs up, and then waits
for the other end to call back. After the password is deliv-
ered in the secure mode, the CSU/DSU is in the ANSWER
mode only. If the setting is CALLBACK ANSWER, the
CSU/DSU waits for a call and password from the CALL-
BACK ORIGINATE unit. It then calls the other unit back.
Password: This field only appears when DBU Mode is set
to CALLBACK ORIGINATE or CALLBACK ANSWER.
The password trigger character and text must be entered
here. The values entered in this field must be identical in the
4001 DSU x.xx/x.xx PRISM 4001 Local Screen
4001 DSU x.xx/x.xx Unit Address: X
----------------------- DIAL BACKUP PARAMETERS -------------------------
DBU Status: DISABLED
DBU COMMAND: [DISABLED]
DBU Activator: [LOS]
DBU Format/Rate: [SYNC] [19.2K] Password
DBU Mode: [Originate] (*********)
DBU Dial String: (ATDT )
Initialization String: (AT&F )
Disconnection String: (ATH0 )
Reset String 1: ( )
Reset String 2: ( )
Reset String 3: ( )
Reset String 4: ( )
Reset String 5: ( )
Figure 4-15 Dial Backup Parameters