Zhone Technologies 900 - Manual (Page 29)

Data Cards IMACS System Release 5.1.6 1-17
HSU Card HSU Card User Screens and Settings
RATE
The Rate setting allows you to select the bandwidth for all time slots assigned to this port. The
available options are 56k or 64k. This selection is multiplied by the number of time slots
assigned to the port, to define the overall port speed. For example, if you choose 64k as the
port Rate and assign four time slots to that port, the overall port speed is 256 kbps.
Tx CLOCK
The Transmit Clock (Tx CLOCK) setting identifies the clock source for the SD (send data)
signal from the external CPE. The int (internal) setting requires an external DTE to
synchronize its transmitted data with the clock on the SCT leads. The ext (extended) setting
requires the DTE to synchronize its transmitted data with the clock on the SCTE leads.
Use ext with a long cable run to ensure the data and clock are in-phase when they arrive at the
system. The DTE must loop back the clock on the SCT leads to the SCTE leads.
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