User's Manual

General Information Guide - Release 3.1
- 5 -
Network Services Units
Network Services Units
The Network Services Units (NSUs) provide connectivity to digital trunks for public or private
networks. Protocol support includes DASS II, PRI, BRI, MSDN/DPNSS, R2, T1/ CAS, Q.Sig, and
XNET.
There are three variants of NSU:
• Mitel Networks 3300 Universal Network Services Unit (NSU)
• Mitel Networks 3300 R2 Network Services Unit (NSU)
• Mitel Networks 3300 BRI Network Services Unit (NSU).
Mitel Networks 3300 Universal Network Services Unit
The Mitel Networks 3300 Universal NSU provides T1 or E1 connectivity and supports up to two T1 or
E1 links per unit. The protocols supported by the T1 interfaces are
• T1 CAS - Digital E and M, Digital CO, Digital DID
• T1 CCS - Primary Rate ISDN (4ESS, 5ESS, DMS 100, DMS 250, NI2, NI3), XNET over PRI,
Q.Sig and MSDN/DPNSS.
The protocols supported by the E1 interface are:
• Q.Sig, Euro ISDN, XNET over PRI, DASS II, and MSDN/DPNSS.
The 3300 Universal NSU connects to a 3300 Controller by using a fiber cable.
Additional digital trunk capacity can be added to the 3300 ICP by chaining two NSUs together via the
Copper Interface Module (CIM) connection using a Category 5 crossover cable.
For detailed information on the hardware specifications, refer to the Hardware User Guide.
Mitel Networks 3300 R2 Network Services Unit
The Mitel Networks 3300 R2 NSU provides connectivity to R2 trunks with MF-R2 digital trunk
signaling. Up to two links are supported by a single 3300 R2 NSU.
The 3300 R2 NSU connects to a 3300 Controller by using a fiber cable.
Additional R2 trunks can be added to the 3300 ICP by chaining two NSUs together via the Copper
Interface Module (CIM) connection using a Category 5 crossover cable.