Services Units and Gateways
Network Services Units
Description
Mitel Network Services Units (NSUs) provide connectivity to digital trunks for public or private
networks.
• NSUs are designed to be installed on a desktop, stacked with other stackable data equip-
ment (including controllers and ASUs), or mounted in a 19" rack or on a wall using brackets
supplied with the unit.
There are three variants of NSUs:
• Universal Network Services Unit (NSU)
• R2 Network Services Unit (NSU)
• BRI Network Services Unit (NSU).
Universal Network Services Unit
The 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&M, Digital CO, Digital DID
• T1 CCS - Primary Rate ISDN (4ESS, DMS 100, DMS 250, NI-2, NI-2-5ESS, NI-2-GTD5,
IDA-P), XNET over PRI, QSIG, and MSDN/DPNSS.
The protocols supported by the E1 interfaces are
• QSIG, Euro ISDN, XNET over PRI, DASS II, and MSDN/DPNSS
The Universal NSU connects to a 3300 ICP Controller through a fiber optic cable. Additional
digital trunk capacity can be added to the 3300 ICP by chaining two NSUs together. NSUs are
chained together by connecting a Category 5 crossover cable from a Copper Interface Module
(CIM) port on one NSU to a CIM port on the other.
Note: The CX/CXi and CX/CXi II Controllers and MXe Server do not support Network
Services Units. The AX Controller only supports R2 NSUs. You can connect up to two
R2 NSUs to the AX Controller.
Note: Both interfaces must be either T1 or E1 and both must be T1 CAS or DPNSS or
DASS II or PRI/QSIG. For T1/D4 and PRI/QSIG, you can mix the variants on each
interface. For example, on T1/D4 you can mix the types on each interface (DID, CO,
E&M) and for PRI/QSIG you can run different protocols for the signalling types.
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