PairGain HIGAIN HLU-231 Manual page 13
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- Manual (78 pages) ,
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- Quick installation manual (8 pages)
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Revision 02
TABLE 2. HLU-231 LIST 7B SYSTEM OPTIONS (CONTINUED)
Mode
Selection
ESAL
17
170
NONE*
LBTO
NONE
20
60*
120
ALM
DIS*
ENA
DS1
AUTO
B8ZS
AMI*
FRMG
AUTO*
UNFR
HiGain Line Unit HLU-231
Description
Activates (closes) the minor alarm relay contacts on pins 20 & 21 and flashes the red STATUS
LED when 17 Errored Seconds (ES) (17 HDSL cyclic redundancy check (CRC) errors on either
HDSL loop or a total of 17 BPVs) occur within a 24-hour period.
Activates (closes) the minor alarm relay contacts on pins 20 & 21 and flashes the red STATUS
LED when 170 ES (170 HDSL CRC errors on either HDSL loop or a total of 170 BPVs) occur
within a 24-hour period.
Prevents generation of a minor alarm due to excessive Errored Seconds.
Disables automatic time-out cancellation of all loopbacks.
Sets automatic cancellation of all loopbacks to 20 minutes after initiation.
Sets automatic cancellation of all loopbacks to 60 minutes after initiation.
Sets automatic cancellation of all loopbacks to 120 minutes after initiation.
Opens the minor alarm relay contacts if closed, and disables activation of the minor alarm relay
when a minor alarm condition occurs.
Enables activation of the minor alarm relay when a minor alarm condition occurs.
The HLU-231 List 7B & HRU-412 independently monitor their incoming DS1 bit streams for
the Binary Eight Zero Substitution (B8ZS) pattern. If either unit detects this pattern, it enters
its B8ZS mode. It reverts back to its Alternate Mark Inversion (AMI) mode if no B8ZS
patterns are received for five seconds.
Places both the HLU-231 List 7B & HRU-412 into their B8ZS modes.
Places both the HLU-231 List 7B & HRU-412 into their AMI modes.
Configures the HiGain system to operate in an auto-framing (AUTO) mode in which it
continuously searches the input T1 bit stream for a valid SF or ESF frame pattern. This feature
is required for fractional T1 applications (DS0 blocking) where it insures proper channel time
slot alignment. While the HiGain system can also process unframed data in this AUTO mode,
it is recommended that the unframed (UNFR) mode be used for all unframed applications.
Using the AUTO mode for unframed applications runs the risk of detecting "pseudo-valid"
frame sequences, which can affect the data integrity.
Configures the HiGain system to operate in an unframed mode. This mode disables the auto
framing process and forces the HiGain system to function as a transparent bit pipe.
PairGain Engineering - Plant Series
January 31, 1997
Table continued on next page
Section 150-231-172
Page 11
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