SR2 Technical Manual EN
Indice : C
25/03/2019
Firmware v2.9
15 / 31
ERECA SAS - 75 rue d'Orgemont, 95210 St Gratien France
T : +33 1 39 89 76 23 W : www.ereca.fr
2.3.12.3 Trunk types
Internally a Trunk comprises of a QSFP+ mounted and connected inside the machine to the LC/PC sockets
on the back of the unit. Different models can cohabitate in the unit depending of customer needs.
There are at least two types of modules available:
STAR2-T4LR: Long Reach optical module offering a guaranteed optical transmission of up to 10km. This is
the most common type of Trunk used in Stage Racer 2.
STAR2-T4ER: For much longer distance the Extended Reach optical module is designed for 40Km
transmission.
CAUTION: The high sensitivity APD receivers of the T4ER may be destroyed by optical power overload, do
NOT apply more than -10dBm on the input port (labelled R). A damaged T4ER receiver port is not covered
by warranty.
Similarly if too much power is applied the receiver may overload and the link will not establishes, in this case
the optical power reading on the interface may be false as well.
NOTE: The Extended Reach module transmission length it may be affected by fiber chromatic dispersion.
Losses in some rare cases of very old fiber.
REMARK:
It is advised to source the QSFP+ at Ereca as factory validates it one by one for compliance with
Stage Racer 2 standard. Also the warranty label will be broken.
