Specifications

9-6 High Speed Data Ports
Model No.
Running Head
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.
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 rlocal (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.
CTS DELAY
The Clear To Send (CTS) Delay setting delays changes in the CTS signal in the local mode.
Enter the value you need in milliseconds. The available options are 0, 30, 60, and 100 ms. If
you do not know what value you need, start with 0 (zero) ms and increase the value gradually
until you no longer experience problems. The CTS option above must be set to locl before the
CTS DELAY setting has any effect.
LOCAL LB
The Local Loopback (LOCAL LB) option activates a loopback on the selected card port.
Choose the dte setting to loop the outgoing data from the external DTE device back to the
DTE receiver. This loopback (see Figure 9-3 on page 9-7) allows you to check the local
cabling and most of the circuitry in the HSU port. It also disconnects the incoming data from
the far end.