User guide

3-20 Encore Multi-port DSU/CSU User GuideÑJuly, 1997

Table 3-6 Menu-5 Data Port Parameters

Parameter Setting Description

Code NORMAL,

HDLC,

FORCED,

DEFERRED

DefaultÑNORMAL. NORMALÑThis code makes the DTE

device responsible for proper ones density (or the T1 line is

conÞgured for B8ZS). Additional ones are not inserted.

HDLCÑ(High Level Data Link Control) The DSU/CSU receives

HDLC data from the DTE device and inverts it (0 to 1, 1 to 0) to

ensure proper ones density. The remote

DSU/CSU inverts the

data to the original polarity before passing it to the DTE device.

FORCEDÑThe DSU/CSU inserts a one into every DS0Õs eighth

bit which reduces the port bandwidth and results in bandwidth

in multiples of 56K. The remote

DSU/CSU removes the 1s

before passing data to the DTE device.

DEFERREDÑThis code provides multiples of 64 Kbps data rates

on T1 lines not using the DS0 timeslot least signiÞcant bit. The

DSU/CSU uses only 7 out of every 8 bits in every DS0 timeslot.

You must allocate additional timeslots to replace the missing bits;

the DSU/CSU does not do this automatically. The total number of

bits allocated to the data port is always a multiple of 8. The last

allocated timeslot can have less than 7 utilized bits.

Loss DTR, RTS or

NONE

DefaultÑ RTS. Select the criteria the DSU/CSU uses for detecting

a loss of signal.

MODE DTE or DCE DefaultÑDCE. ConÞgure the data port as a DTE (Data Terminal

Equipment) or DCE (Data Circuit Equipment). Use the

appropriate cable for each mode.