Issue 1, Section 150-231-164
Revision 04
Page 33
TABLE 12. HLU-231 LIST 6D/ HDU-451 LIST 1, 2, & 3 DEPLOYMENT GUIDELINES
Shelf Type
Shelf Fuse
Amps
Max Number of Doubler
Systems Per Shelf
(60 mA CPE Current ON)
Max Number of Doubler
Systems Per Shelf
(60 mA CPE Current OFF)
List 1 & 2
List 3
List 1 & 2
List 3
-48 V New Bays
(J98725P, J98725P,
J98725P)
20
13
13
13
13
SXSS (CO)
(J98725CA)
10
10
13
13
13
Original 220 Bays
(J98725A, B, C, D, E, F)
3.43
4
5
5
6
Upgraded 220 Bays
(J98725A, B, C, D, E, F)
20
13
13
13
13
SXSS (80D Cabinet)
5
5
7
6
8
Kentrox T-Term 220
10
10
13
13
13
PairGain HCS-417
20
14
14
14
14
2.05
The thermal loading limitations imposed when
using the HLU-231 List 6D in Controlled
Environmental Vaults (CEV) or other enclosures are
determined by applying the HLU-231 List 6D power
parameters to the manufacturer requirements for each
specific housing.
2.06
The power consumption listed in Table 11 is the
total power that the HLU-231 List 6D consumes
or draws from its -48 VDC shelf power source. This
parameter is needed when the HLU-231 List 6D is
located remote to its serving CO. It determines the
battery capacity required to maintain an 8-hour stand-by
battery reserve for emergency situations. It thus limits
the maximum number of plugs per remote enclosure.
Use this data to perform this analysis on a case by case
basis.
3. LOOPBACK OPERATION
3.01
The HiGain system has a family of loopback
options. The most important of these is the
Smart-Jack loopback which enables the HRU-412 to
respond to the standard (2/3 in 5) Smart-Jack in-band
loopback codes. This option can be enabled or disabled
from either the front panel settings or the terminal
SYSTEM SETTINGS Menu Screen.
3.02
In addition to the Smart-Jack loopback, the
HiGain system can be configured for one of five
special in-band loopback (SPLB) command sequences.
These are selected from the SPLB user options shown
in Table 1. The loopback locations are shown in Figure
14.
3.03
“GNLB” is the HiGain system Generic loopback
code. The GNLB allows in-band codes from the
network to loop-up either the HLU/NLOC (4 in 7) or
HRU/ NREM (3 in 7) towards the network. In addition, it
allows in-band codes from the Network Interface (NI) to
loop-up the HLU/CREM (6 in 7) or HRU/CLOC (5 in 7)
towards the customer. For Doubler applications it
permits looping Doubler #1 towards the network NDU1
(2 in 6) or towards the customer CDU1 (4 in 6). Doubler
#2 is looped towards the network with NDU2 (3 in 6) or
towards the customer with CDU2 (5 in 6). Either loop-up
condition is terminated (looped-down) with the (3 in 5)
loop-down code. All messages must be present for five
seconds before the HiGain system will respond. Table
13 lists the test procedures that apply when using the
GNLB mode.
