SSC Expansion Cabinets
Two types of Small System Expansion Cabinets exist: Fiber and IP. Fiber expansion cabinets are relatively transparent, IP Expansion Cabinets allow for Survivability if communication with the Main cabinet fails (requires an additional keycode).
The following Fiber Expansion daughterboards, installed on the SSC card in the Main Cabinet, must be paired with the corresponding Fiber Receiver card installed in the Expansion Cabinet (slot 0).
Expansion DB Receiver Card Distance, Mode Single-port NTDK22 NTDK23 10 m (33 ft), Plastic Multimode NTDK24 NTDK25 3 km (1.8 mi), Multimode NTDK79 NTDK80 3 km (1.8 mi), Single Mode Dual-port NTDK84 NTDK23 10 m (33 ft), Plastic Multimode NTDK85 NTDK25 3 km (1.8 mi), Multimode
A NTDK23 Receiver Card uses the orange A0632902 Plastic Multimode cable.
NTDK20 SSC cards always require a security dongle, there are two types:
- NT_STD - for the Main Cabinet
- NT_REM - for IP Expansion Cabinets
IP Expansion:The following IP Expansion daughterboards can be installed on the SSC card in both the Main or Expansion Cabinet:
- NTDK83 - dual-port, 100BaseT
- NTDK99 - single-port, 100BaseT
- NTTK02 - dual-port, 100BaseF
- NTTK01 - single-port, 100BaseF
IP expansion SSC cards require a NT_REM dongle. To install, select: "1. Media Gateway/IP Expansion Cabinet" from the "Software Installation Main Menu", and enter the IP address information.
Note: When both Fiber and IP Expansion daughterboards coexist in a system, set the Fiber Expansion daughterboard in Position 1 (Ports 1&3) and the IP Expansion daughterboard in Position 2 (Ports 2&4).
|Cabinet / Port:||Card Slots:|
|Main Unit||1 - 10|
|Expansion #1||11 - 20|
|Expansion #2||21 - 30|
|Expansion #3||31 - 40|
|Expansion #4||41 - 50|
Small system terminal numbers (TN's) comprise Card and Unit numbers.
The cabinet card slot designations are as shown right:
- Two single-port expansion daughterboards will service Expansion cabinets 1 & 2.
- A single dual-port expansion daughterboard will service Expansion cabinets 1 & 3, or 2 & 4.
STAT CPU and
STAT FIL in LD 135 to check the configuration.
NTDK20 DaughterBoard LEDs:
|Port Status LED (Layer 7)|
|Link is up and running|
|Link trying to establish|
|Link is down|
|No DB port present|
A survivable IP Expansion Cabinet is able to function without access to the Main SCC, eg, during an outage. This feature is keycode activated. Switchover can be manually invoked with SBFS/SOTS in LD 135, or automatic when the Switchover Time Out timer (SWOTO) expires, set in LD 117. Automatic Switch Back from survival mode is set by the AUTOSB command in LD 117.
The customer database is replicated (during EDD) to the IP Expansion Cabinet SSC's, this is used locally when in Survival mode. A database download can be forced by
DWL cab# in LD 43. If a cab# is omitted, the database is sent to all IP cabinets. Any local changes made while is survivable mode will be lost on switch back, as LD 43 and 143 are not available in survival mode.
Dial tone in survival mode is different from that in normal mode. The Flexible Survivable Dial Tone (SURV) is set LD 56.
Enable cabinet x
Disable cabinet x
Disable the cabinet in LD 32, then the fiber port in LD 135.
DIS FIL n
Disable fiber optic link n (1-4)
ENL FIL n
Enable fiber optic link n (1-4)
LLBK FIL n
Perform local loop back test on fiber optic link n
LLBK ip n
Perform local loop back test IP connectivity link n
RLBK FIL n
Perform remote loop back test on fiber optic link n
Switch Back From Survival. Force IP cabinet to Normal/Slave mode
Switch Over To Survival mode. Force IP cabinet to Local/Survival mode
Get status of all fiber optic links
STAT FIL n
Get status of fiber optic link or IP link n
STAT IPL cab
Get the IP link status between Call Server and MG 1000S
Get MAC address of IP daughterboards installed on SSC card
LOCK x IP
Lock an expansion cabinet (or MG 1000S) in its current operating mode
Unlock an IP Expansion cabinet (or MG 1000S) from its operating mode
PRT SURV cab#
Print Survivability parameters
PRT CAB cab#
Print Cabinet parameters
CHG SURV cab# (NO) YES
Allow Survivability for each IP Expansion cabinet
CHG AUTOSB cab# (YES) NO
Automatic Switch Back (AUTOSB) option On/Off
CHG SWOTO cab# seconds
Switchover Time Out timer, 2 - (120) - 600 seconds