Nortel Meridian 1 Hardware Replacement Manual page 105

5 With the Nortel side facing upward, slide the Security Device between
the security device holder and the holder clip in the new IODU/C card.
Do not bend the clip more than necessary when inserting the Security
Device. Ensure that the Security Device is securely in place.
6 Insert the new IODU/C into the following slots:
a. For NT5D21 Core/Net Modules, insert the IODU/C in slots 17,18,
and 19.
7 Lock the locking devices by pushing them gently towards the
faceplate. Set the ENB/DIS switch to ENB.
A blinking letter "E" and number "5" displayed indicates that a failure occurred.
In that case, reseat the Security Device in its holder and reinsert the card.
8 Press the MAN RST button on the CP card.
Once the keycode is validated against the Security Device, the Install menu is
displayed.
Replacing equipment
Hardware Replacement
Page 105 of 250