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1. STMU and SET in BSC3i
STMU and SET is included in BSC3i first deliveries and in S12 upgrade
deliveries.
Purpose: In S12, there are two ways to equip ETS2 plug-in units into GTIC
cartridges:
• The default way is to equip four ETS2 plug-in units to both
GTIC cartridges (GTIC cartridges powered by different PDFU-
Bs) and to use both STM-1/OC-3 interfaces (two active and two
standby SETs per STM-1/OC-3 interface) of ETS2 plug-in units.
• The alternative way is to equip eight ETS2 plug-in units to both
GTIC cartridges (GTIC cartridges powered by different PDFU-
Bs) and use only the first one of the STM-1/OC-3 interfaces
(active SET + standby SET) of ETS2 plug-in units.
The optical interface from the front panel of the ETS2 plug-in unit is
cabled through the CPGO at the cabinet top.
One STMU unit (that is, one ETS2 plug-in unit) has four SETs in use in
the default alternative presented above and in the other alternative one
STMU unit (that is, one ETS2 plug-in unit) has two SETs in use.
In optical interface redundancy, only even STMU indexes are used;
either four (by default) or eight (alternative) in both cartridges (GTIC 0
and GTIC 1).
Redundancy: Transmission protection
Type: Functional unit
Plug-in units: ETS2 Exchange Terminal for 2 x STM-1/OC-3
Interfaces: GSW2KB
Control interface from a signalling unit (through GSW2KB)
STM-1/OC-3 (SDH/SONET)
Synchronisation
Optical interface panel
SFP Single-Mode LC Optical Transceiver Modules, SFPS1L
In S12, the new 2048 PCM bit group switch GSW2KB is a prerequisite
for the use of SDH/SONET Exchange Terminal (SET). One ETS2 plug-
in unit forms a STMU functional unit. Depending on configuration, each
STMU consists of two or four SETs. One SET consists of 63 STM-1
(ETSI) / 84 OC-3 (ANSI) ETs.
The SETs, both active and standby, are installed in the GT4C-A
cartridges. The number of SET units with an optical interface

2. redundancy in S12 first deliveries is from 0 to 32 (16 active and 16
standby; in steps of one active and one standby at a time). All SETs
have a unique index of their own.
The GT4C-A cartridges can contain up to eight ETS2 plug-in units, each
containing two SET functional units.
Figure: STMU and SET in GT4C-A (GTIC 0 and 1) cartridges
Table: STMU and SET in GT4C-A cartrige (GTIC 0 and GTIC 1; two
active + two standby SETs in user per ETS2)
Position Name Function Notes
F01 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F02 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F03 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F04 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F05 SHIM4T Shim plate
F06 SHIM4T Shim plate
F07 SHIM4T Shim plate
F08 SHIM4T Shim plate
F09 SHIM4T Shim plate

3. Position Name Function Notes
Notes
1) If no ETS2 is equipped, SHIM4T is left equipped in this slot.
2) Number of hotlinks: 2 x 2
Table: STMU and SET in GT4C-A cartrige (GTIC 0 and GTIC 1; one
active + one standby SET in user per ETS2)
Position Name Function Notes
F01 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F02 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F03 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F04 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F05 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F06 SHIM4T/
ETS3
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F07 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F08 SHIM4T/
ETS2
Shim plate /
SDH/SONET Exchange Terminal
1)
2)
F09 SHIM4T Shim plate
Notes
1) If no ETS2 is equipped, SHIM4T is left equipped in this slot.
2) Number of hotlinks: 2 x 1