Zycoo Mod E1 ISDN PRI

The Primary Rate Interface (PRI) is a standardized telecommunications service level within the Integrated Services Digital Network (ISDN) specification for carrying multiple DS0 voice and data transmissions between a network and a user.

PRI is the standard for providing telecommunication services to offices. It is based on the T-carrier (T1) line in the US and Canada, and the E-carrier (E1) line in Europe. The T1 line consists of 24 channels, while an E1 has 32.

The four LEDs (Light-Emitting Diodes) assembled on the mainboard indicates port status:

LED 1:
Solid Red = Module loading success
Red Off = Module loading failure

LED 2:
Solid Red = CPE signal
Solid Green = NET signal
Off = No signal

LED 3:
Solid Red = SS7 signal
Solid Green = Mfcr2 signal
Off = NO signal

LED 4:
Red = Disconnected / Alarm
Green = Connected / No alarm

Note: 1PRI module can not be inserted to SLOT 2 of U50.