NEC Xen Master System Hardware Manual page 164

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4.13 IPT(4)/(8)-U13 ETU
4.13.1 Description
The IP Gateway IPT(4)/(8)-U13 ETU is an optional
interface for the Xen KSU that can combine various trunk
and Tie line calls into Gateway trunks. This ETU can be
assigned as a two-port TLI(2)-U13, four port DID(4)-U13/
COI(4)-U13/COID(4)-U13 ETU, or eight-port COI(8)/
COID(8)-U13 ETU
Xen Master & Xen Axis
IPE(4)-U 13
for IPT(8)-U 13 ETU
C onnects to J5
Figure 5-1 IPT(8)-U13 ETU
Installing Electronic Telephone Units