Verilink PRISM 4101 (34-00230) Product Manual - Manual (Page 20)

8 C HAPTER 2: I NSTALLATION
assignments. See Appendix B, Customer Service for cable information. The COA
feature works through the supervisory port only.
You can configure the unit firmware through this port as well as the COA feature
on page 45. You may access this port through either a direct VT100 connection or
a dial-up connection via an AT command set compatible modem. The modem
should be configured to ignore DTR, enable auto answer, inhibit command echo,
and return verbose result codes.
If you call the unit and send the BREAK command before receiving the CONNECT
message, the modem will hang-up.
You can perform network management through the SUPV port as well as the LAN
port (page 5) or the SLIP port (page 6). The unit incorporates the full TCP/IP
stack, supports inbound telnet, and has an embedded SNMP agent for trap
reporting or SNMP monitoring and management supporting the DDS specific and
TxPORT enterprise MIBs as listed in Appendix A.
DBU The Dial Backup port is a 10 -pin modular connector that either interfaces with an
RS-232 DCE connection on an external device or supplies the connection to the
switched network when the internal Dial Backup option is installed. When the port
is used with an external device, it can interface to a synchronous or asynchronous
device. Configuration of the external device is achieved through AT commands that
are configured in the DBU screen of the terminal interface (page 46). The internal
Dial Backup option can be ordered as either a 33.6 modem or as an ISDN terminal
adapter. Pinout assignments for the DBU port are shown in Table 2-3. Interface
cables can also be ordered from TxPORT (page 62).
✍
Table 2-3 DBU Pinout Assignments
Pin
External DBU
Connection
Internal ISDN
Connection
Internal Modem
Pinout
1 Tx Clock In
2 DTR In
3 RTS In
4 Frame Ground Ground
5 Data In ISDN U-Interface Tip
6 Data Out ISDN U-Interface Ring
7 Signal Ground Ground
8 CTS Out
9 DCD Out
10 Rx Clock In