Digital Trunk E1/T1 Interface

Note: This chapter does not apply to MGU2-X.

MGU2 provides 4 digital trunk interfaces (PRI:s) of type E1 or T1. Each PRI is implemented as a “virtual board” in the “virtual magazine 2” (i.e. EQU range 2-0-00 to 2-30-31) and can be configured and run independently of each other.

The configuration of E1 resp T1 framing of each interface is done during “board” activation. Each interface can be configured as either:

E1 with ISDN protocol (corresponding to a TLU76/11 board)
E1 with CAS protocol (corresponds to a TLU76/13 board)
T1 with ISDN protocol (corresponding to a TLU77/11 board)

MGU2 ISDN/PRI interface has been verified to comply with ETSI TBR004 (EU), TIA-968-A 47 CFR Part 68 (US), CS-03 Issue 9 Part VI (CA), AS/ACIF S038 (AU) and Newsletter No 125 (NZ).

MGU2's Layer 1 and 2 supports ETS 300 011 and ETS 300 125 respectively.

When an E1 interface is configured as CAS trunk the ISDN Layer 2 protocol in time slot 16 is replaced by a CAS multi frame structure and signaling according to ITU-T G.732 for 2048 kbit/s. MGU2 supports MFC R1 and R2 signaling, replacing similar functionality in the MFU board.

Configuration parameters per PRI are set in run-time in the MX-ONE Service Node SW:

Application = E1 or T1
Network Termination = User side or Network side (for ISDN)
A set of parameters unique for CAS trunk

Note: The E1 interface can as well be used for CAS Extension. In this configuration, 30s logical extensions can be represented at each E1 port.

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