Meridian Nortel 1 Option 11C Technical Reference Manual page 217

System Controller cards Page 217 of 544
Figure 23
Fiber Receiver card in fiber expansion cabinet (NTDK23 shown)
PCMCIA interface
The NTDK20 SSC card has a PCMCIA interface through a socket located on
its faceplate. The PCMCIA socket can accommodate a Software Delivery
card used for software upgrading and as backup media.
Security device for the IP Expansion
The SSC card on the Option 11C Main cabinet must contain a NTDK57AA
Security device which is keycoded to match the NTDK57DA Security device
on each IP expansion cabinet.
Option 11C and 11C Mini Technical Reference Guide