User Guide: Technical Reference
SECTION 3 OPERATING THE
ioLink 4
PRELIMINARY
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-3-12
(2) Remote
The data from the user device connected to the DSX or G.703 interface is looped back to
it as well as passed through the modem to the far end of the link. Data from the far end of the link is
ignored.
(3) Network
The line interface chip looks at the data stream received from the DSX or G.703 interface
for the NLOOP enable and disable data patterns. When the enable pattern is repeated for five
seconds, the modem is placed into remote loopback (as above).
3.1.4 Remote Control (CONSOLE) Connector
The DE-9 connector is used to interact with the SNMP-compliant agent embedded into the modem unit.
This feature allows user SNMP software to interface with the
ioWave
SNMP-compliant agent. The
Revision 1.1.1 version of the embedded software includes a serial interface that communicates via User
Datagram Packets (UDP). Future versions will have a Point-to-Point Protocol (PPP) interface.
3.1.5 E1/G.703 Interface
The two female BNC connectors, labeled TX and RX, are used to connect an E1 device to the modem
unit. You may also connect the E1 device to the modem unit using the RJ-48C connector. There is a two-
pin jumper inside the modem unit to provide an (optional) ground to the outer conductors of the TX and
RX connector.
Note:
The termination impedance is selected via an internal jumper, JP319. Units shipped as E1 are
terminated at 75 ohms (jumper installed).
3.1.6 T1 Interface
User
RF
Spreading
Section
LIU
FEC
IF
Section
Figure 3-7. LIU Loopback (Remote)
