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COMSPHERE 3600 Series Data Service Units
2-6 March 1999 3610-A2-GB41-60
Changing the Flex Interface Switch
The TDM or MCMP field installation upgrade is
shipped from the factory with the switch position set to
EIA-232. The following procedure tells you how to
change this setting to V.35 or back to EIA-232.
" Procedure
1. Determine whether the port interfaces will be
strapped for EIA-232 or V.35.
2. Locate interface Switch S1 on the TDM/Flex or
MCMP/Flex circuit card (Figure 2-5).
If you have the 6-port version of the TDM/Flex or
MCMP/Flex, Switch S1 has four straps, but only
Strap 1 is used. (S1 is not installed on 2-port
versions of the TDM/Flex or MCMP/Flex.)
3. Insert a small pointed tool into position 1 of
Switch S1, and carefully flip the switch in the
direction of the circuit card label identifying the
setting. To select EIA, push switch to EIA (Off)
direction. To select V.35, push switch to V.35
(ON) direction.
4. Reinstall the DSU circuit card, securing it to the
base with the three screws (refer to Figure 2-4).
5. Reconnect the LCD, keypad, and TDM/MCMP
flat cables.
6. Replace the cover over the expanded base,
carefully aligning the rear panel and four snap tabs
over their corresponding slots.
7. Press the cover and base together until all four
tabs snap into place.
Figure 2-5. Changing TDM/Flex or MCMP/Flex Interface Compatibility