Chapter 4: Eiu Maintenance - Nortel DMS-100 User Manual

Chapter 4: EIU maintenance

This chapter provides information on Ethernet interface unit (EIU)
maintenance.
EIU maintenance is limited to hardware diagnostics for the Ethernet interface
card (EIC) and the Ethernet interface paddle board (EIP). The maintenance
procedures do not include detection or isolation of hardware faults for LAN
equipment beyond the EIP, such as a media access unit (MAU) or hub.
However, the DMS-100 switch can detect some local area network (LAN)
faults, which it reports using EIU in-service trouble alarms and logs.
CAUTION
Possible loss of network security
Using the Ethernet interface unit (EIU) and a telnet or file
transfer protocol (FTP) session to establish a maintenance
and administration position (MAP) session can introduce a
security risk to both the DMS node and its subtending
network.
When establishing and operating a MAP session in this way,
there is limited security for clear text (user identification and
passwords) and for Internet Protocol (IP) addresses for
screening. This limited security makes an open local area
network (LAN) vulnerable to entry by unauthorized persons.
Nortel recommends that the operating company, as a
minimal precaution, integrate intermediate security servers
with encryption to avoid unauthorized access to the switch.
For alternative approaches, contact your Nortel
representative to discuss state-of-the-art secure OA&M data
communications equipment products.
By using the EIU, telnet, and FTP software, the operating
company assumes any and all risks associated with the
implementation and use of this hardware and software.
DMS-100 Family EIU User Guide August 1999
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