Instruction manual

Strata DK424i
Remote Expansion Cabinet Unit
30 Strata DK General Description 6/00
Remote Expansion Cabinet Unit
The RRCU PCB enables a DK424i Expansion Cabinet to be located up to three kilometers from its
Base Cabinet. One RRCU connects to up to two ribbon-type Data Cables and applies the inter-
cabinet signal to a fiber-optic pair. One fiber pair can support one or two expansion cabinets in one
remote location using one RRCU in the Base Cabinet and another in the Remote Expansion
Cabinet.
A DK424i Base Cabinet will support up to four RRCU PCBs. A DK424i will support up to four
Remote Expansion Cabinets.
Remote cabinets support all line and trunk interfaces. Network clock signals can only be derived
from digital trunks installed in the Base Cabinet (Master) location.
One BDCL cable set is required for each RRCU (master and slave) except for the daisy chain
configuration where only one BDCL cable set is required at the intermediate site.
Power Considerations
Each DK424i Base and Expansion Cabinet houses a power supply that furnishes power to all of
the stations and some of the peripherals that interface with the cabinet (see Table 24).
Reserve Power
Two or four customer-supplied 12VDC reserve batteries can be connected to the system to
maintain normal operation during a power failure (see Tables 26 and 27). The batteries are kept in
a highly-charged state by the standard power supply and must be connected when the system is
operating normally. Fully charged batteries must be connected when normal AC power is
available, batteries cannot be connected after/during an actual power failure.
Table 24 DK424i Electrical Characteristics
DK424i Primary AC Power Voltage
Input Voltage
AC Frequency
Watts per cabinet (continuous)
Watts for five cabinet system
115VAC
±10V or 208VAC±20V or
240VAC
±20V
50/60 Hz, Single-phase
180
900
DK424i Primary Power Current Consumption (Rating in Amperes)
120VAC 208VAC 240VAC
1 cabinet
2 cabinets
3 cabinets
4 cabinets
5 cabinets
3.2 amps.
6.4 amps.
9.6 amps.
12.8 amps.
16.0 amps.
2.2 amps.
4.4 amps.
6.6 amps.
8.8 amps.
11.0 amps.
2.0 amps.
4.0 amps.
6.0 amps.
8.0 amps.
10.0 amps.
Power Supply Unit (BPSU672)
DC voltage output specification
-24VDC (-26.3~-27.8VDC, 6.0 DC amps. )
+5VDC (+4.5~5.5VDC, 4.0 DC amps.)
-5VDC (-4.5~-5.5VDC, 0.8 DC amps.)