Zhone IMACS 8000 User Manual page 434

Running Head
HSU Card User Screens and Settings
If ext is selected but the system does not detect an incoming clock on the SCTE leads, the HSU
Card automatically generates an internal clock. If this clock is not synchronized with the
incoming data, reset the CLOCK PLRTY option to synchronize the clock and data. The Tx
CLOCK PLRTY option settings are described in the next paragraphs.
On the HSU-T V11, HSU-T 35 and HSU*4E 530/35 SS Cards, the Transmit Clock option can
be set only if the Mode for the card port is set to dce. The default TX Clock setting in the dce
mode is int. For a dte port, the only available setting is n/a.
Tx CLOCK PLRTY ( 821660 card )
The Transmit Clock Polarity (Tx 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).
On the HSU-T V11, HSU-T 35 and HSU*4E 530/35 SS Cards, the Clock Polarity setting
above can be set only if the port Mode is set to dce. The default setting in that node is norm.
For a dte port, the only available setting is n/a.
DATA PLRTY
The Data Polarity (DATA PLRTY) option allows you to either send all data bits to the network
as normal ones and zeros, or to invert all bits in the transmitted data stream. Choose norm
(normal) to leave the transmitted data intact; or, choose inv (inverted) to invert all outgoing
data. This can be helpful in ensuring minimum-ones density transmission over T1 links when
the data contains long strings of zeros. Inverting the zeros reduces the likelihood that the
composite T1 stream will not meet minimum-ones density requirements. Both systems of the
end-to-end HSD circuit path require the same DATA PLRTY option setting.
On the HSU-T V11 and HSU-T 35 Cards, the Data Polarity option is available only if the port
Mode is set to dce. The default setting in that mode is norm. For a dte port, the only available
setting is n/a.
CTS
The Clear To Send (CTS) setting controls when data is sent. Some DTE equipment must
receive a CTS signal before transmitting data. Set the CTS option to perm (permanent) to
make CTS permanently High (asserted). Choose rlocl (remote-local) to allow RTS to control
both CTS on the local DTE device and RLSD on the remote DTE device.
Choose to ignor (ignore) to always force CTS Low (negated). Set the CTS option to locl
(local) to make CTS follow RTS from the local DTE.
14-14
Model No.
HSU Card
Data Cards