150-319-205-05, Issue 5
Compatibility
ELU-319 List 5E and List 6E
January 26, 2000
5
H
I
G
AIN
D
OUBLER
C
IRCUIT
D
EPLOYMENT
All generations of HiGain ELU and ERU modules are compatible with each other. Although all HiGain doublers
are backward-compatible with all prior ELU and ERU models, some of the circuit application enhancements of
newer doubler models require that all circuit modules be of the same type in order to realize these enhancements.
Enhanced doubler applications preclude the mixing of newer doubler models with older models of the ERU
and ELU.
Table 3
provides HiGain doubler deployment rules to achieve maximum circuit enhancement:
•
Maximum number of doublers allowed for a given circuit, depending upon the doubler and line unit models
used to implement the circuit.
•
Any restrictions on the ERU models.
All spans are fully HCDS-compliant unless otherwise specified. Circuits that use more than
one type of doubler are governed by the most limiting doubler rules. For example, if the
EDU-451 is used with the EDU-409, use the EDU-451 deployment rules.
Table 3.
HiGain Doubler Deployment
Maximum Number of Doublers Per Circuit
EDU-451 List 1 and List 2
EDU-409 List 1
ELU Model
Line Powered
Remote
Local Powered
(1)
Remote
(1) The ERU-412 List 1D and List 2D can be powered locally. The ERU-412 List 1E and
List 2E cannot be powered locally.
Line Powered
Remote
Local Powered
(a)
Remote
ELU-319
List 5E and 6E
1
2
2/3
(2)
(2) The ERU-412 List 1D and 2D supports two doublers. The ERU-412 List 1E and List 2E
supports three doublers.
2
