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The Indoor Unit (IDU) Chapter 1
FA4800 User Manual Release 1.9.30 1-10
The IDU-E rear panel (right to left) has a 25 pin Dry Contact Alarms port.
the two (or no) trunk ports, two LAN ports, an ODU port and finally a 3 pin
DC power plug identical to that used on the IDU-C.
.
Figure 1-11: New style IDU-E: Rear panel
IDU-R
The IDU-R is a compact, half 19 inch, 1U plastic unit for 1 x T1/E1 backup,
providing in addition 2 Ethernet ports and an external alarms interface. It
looks the same as the IDU-E above, without the HSS LED. The IDU-R is an
indoor unit used for automatic backup of leased lines. The IDU-R monitors
the status of leased lines, and in the event of a connection failure automati-
cally switches to the radio link. You may choose which of the two links is the
main link and which is the backup link. The IDU-R may be configured for
multi-hop (see
Chapter 24 ).
Figure 1-12: IDU-R Rear Panel
Figure 1-13: Backup link for E1/T1 connections
IDU-C
The IDU-C is a carrier-class 19 inch, 1U unit, providing E1/T1 ports,
Ethernet ports, dry contact alarms and indication LEDs. It has two