Zhone Technologies 900 - Manual (Page 34)

1-22 IMACS System Release 5.1.6 Data Cards
Model No. Running Head HSU Card User Screens and Settings HSU Card
LB DET
Depending on the selection you made for the Loopback Generation mode above, the HSU
Card port will respond to any of the loopback codes generated by a remote system. The
Loopback Detection (LB DET) setting lets you enable or disable this capability on each card
port. However, this setting does not affect local loopback commands from a local control
terminal.
Choose off to have the system ignore remote loopback commands. Choose on to make the
system monitor the card ports for loopback commands sent from the remote equipment. Note
that the system will detect only the loopbacks in the format selected as the LB GEN mode.
When the system detects a loopback code, it loops the data back until the remote equipment
releases the loopback. The w/to (with time-out) setting is the same as on, except that after 10
minutes the system automatically releases the loopbacks initiated by the remote equipment.
On the HSU-T V11 and HSU-T 35 Cards, the same choices above appear only if the port Mode
is set to dce. For a dte port, this setting is always n/a.
ISDN CONN
This option is not available with this host release.
EER (821360 card)
The Excessive Error Rate (EER) parameter is only available on the HSU-AD 530/35 Card.
This setting defines an error rate threshold which, when exceeded, causes an alarm to be
declared. If the number of errors exceeds this threshold, an E will be placed in the Status
Column of the card’s Performance Monitoring Screen. The available options are from 10e-4
(one error in 10,000 bits) to 10e-9 (one error in 1,000,000,000 bits), or none. Choose none if
you do not want to report alarms for excessive error rates.
Rx CLOCK PLRTY (821660 card)
The Receive Clock Polarity ( Rx CLOCK PLRTY) setting provides another way to
compensate for long cables in those cases where the DTE equipment does not provide SCTE.
When you choose inv (inverted mode), the relationship between the clock and data is altered
to compensate for long cable runs that the data signals must traverse between the card port and
CPE. When you choose norm (normal), the relationship between the clock and data is
unchanged. If you use inv, set the Tx CLK (Transmit Clock) option above to int (internal).
Only the HSU*4E 530/35 SS Card supports this parameter. For all other HSU’s this setting is
n/a. The default setting in that node is norm. For a dte port, the only available setting is n/a.