Nortel Meridian 1 Succession 1000M Installation And Configuration Manual page 499

Figure 132
Display telephone
Remote TTY
Survivable IP remote TTY
The three Serial Data Interface (SDI) ports on the Small System Controller
(SSC) card of an IP expansion cabinet or chassis are available for use as
additional system remote TTYs.
If the IP expansion cabinet or chassis is configured for Survivability, the SDI
ports of the IP expansion SSC can be used during survival mode. In this
mode, they function as a TTY connected to a stand-alone Small System.
However, the TTY has no access to either LD 43 or LD 143. When in survival
mode, the SDI ports of the IP expansion cannot be used to access the main
cabinet or chassis. Refer to Table 135 for SDI port numbering.
Table 135
SDI port numbering
Cabinet or chassis
Main
IP Expansion 1
IP Expansion 2
IP Expansion 3
IP Expansion 4
Survivability
Local mode
Normal mode
0, 1, 2
3, 4, 5
6, 7, 8
9, 10, 11
12, 13, 14
Small System Installation and Configuration
Page 499 of 562
Survival mode
0, 1, 2
0, 1, 2
0, 1, 2
0, 1, 2
0, 1, 2