DLP-521: Detailed Level Procedure 363-206-285
Page 1 of 4 Issue 2, February 2000
DDM-2000 OC-3 MULTIPLEXER
Connect CIT and Establish Session
1.
!
CAUTION:
You must wear an ESD wrist strap plugged into the grounding jack on the
right side of the assembly whenever working with the DDM-2000.
NOTE:
If all shelves in a bay are connected together with CIT bay mult cabling,
the CIT may be connected to any shelf front or rear CIT connector and
gain access to any other shelf by entering a shelf address. If the CIT is
connected to the rear CIT connector, it must be connected through a null
modem.
NOTE:
If shelves are connected together with bay mult cabling and ANY shelf in
the chain becomes unpowered with the SYSCTL inserted, CIT
communications will be lost to all shelves. Once the shelf is repowered,
CIT communications are restored without established login sessions
being dropped. If shelves are not powered, the SYSCTL should not be
inserted.
NOTE:
With a CIT baud rate of 19200, CIT communication to a shelf may fail if
the CIT bay mult cabling is connected to the shelf but not terminated on
the next shelf. This condition is only present at baud rates greater than
9600 and does not affect communication at lower baud rates.
Connect CIT to the RS-232C CIT connector on the DDM-2000 User Panel or
rear CIT connector.
2. Turn on CIT and set terminal parameters as follows (consult your terminal’s
manual for setup procedures):
• Full duplex.
• 8 data bits.
• 1 start bit.
• 1 stop bit.
• No flow control.
• Baud rate setting is automatically set by DDM-2000 when connection is
made.
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