ADTRAN 1200218L1, User Manual

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Chapter 2. Installation and Operation
2-6 OSU 300 User Manual 61200663L1-1
DTE Port 1 (HSSI Interface)
DTE port 1 is a built-in HSSI port that resides on the main board of
the OSU 300. Configure the bandwidth of this port in 75 kbps
increments from 75 kbps to 44.2 Mbps. If a single application
requires the full 44.2 Mbps of bandwidth, the OSU 300 does not
have to be equipped with additional port cards. Appendix A
contains the pinout for this port.
Alarm Connector
The alarm connector is a three-position, screw-type terminal block
that connects to the three contacts of a Form C-type relay on the
main board of the OSU 300. This relay activates any time the OSU
300 detects an alarm condition on the high-speed network
interface. Table 2-1 describes the alarm connector terminal block.
Use the
A
LARM
R
ELAY
selection of the C
ONFIGURATION
menu to
disable the alarm function.
LAN Port
The LAN port is an 8-pin modular connector that provides a
10BaseT Ethernet LAN interface. This interface uses SNMP and
Telnet to control the unit. Appendix A contains the pinout for this
port.
Table 2-1. Alarm Connector Terminal Block Description
Position Name Description
Left NC (Normally Closed) Opens when a selected alarm condition is
present.
Center COM (Common) Common connection between external circuitry
and NC or NO terminal.
Right NO (Normally Open) Closes when a selected alarm condition is
present.