Verilink PRISM 4101 (34-00230) Product Manual - Manual (Page 52)

40 C HAPTER 4: T ERMINAL I NTERFACE
Port Format. Can operate in two general modes, Sync and Async with async
allowed only in the TxPORT proprietary mode and line rates less than 56 kbps in
async format only. See Table 4-4 for details on configuring the format.
DSR Control. Data Set Ready is output from the unit to the DTE. Its behavior can
be set to TEST>OFF where DSR is On except when the unit is in test or set to
FORCED ON all the time regardless of any unit condition.
DCD Control. Data Carrier Detect is output from the unit to the DTE. Its behavior
can be set to IDLE>OFF where DCD is On except when the unit is receiving idle
code from the network or FORCED ON all the time regardless of any unit
condition.
RTS Control. Request To Send is input from the DTE to the unit. Clear To Send is
an output from the unit to the DTE. The behavior of RTS and CTS can be set to
NORMAL where CTS tracks RTS or FORCED ON all the time regardless of any
unit condition.
RTS/CTS Delay. Allows you to choose the amount of delay on an RTS to CTS
transition. When set to NORMAL, the unit reacts to RTS from DTE. When RTS is
On, the unit transmits data normally and turns CTS On (depending on the setting
of Circuit Assurance and after the delay set by the RTS/CTS Delay option). When
RTS is Off, the unit transmits idle code to the network and turns CTS Off. When
the delay is set to LONG, the delays are longer. Table 4-5 displays the delays
associated with the data rates.
DTR Alarm. Selecting ENABLE allows the unit to go into alarm on loss of DTR.
The unit will not go into alarm upon loss of DTR if DISABLE is selected.
V.54 Loop. Selecting ENABLE allows the unit to respond to inband V.54 loop
commands. If DISABLE is selected, the unit ignores these commands.
LL Detect. Allows you to select whether the unit will respond to the Local Loop
lead on the DTE connector. When the DTE device changes the state of this lead,
the unit will activate or deactivate a Local Loopback. The default setting is
DISABLE.
RL Detect. Allows you to select whether the unit will respond to the Remote Loop
lead on the DTE connector. When the DTE device changes the state of this lead,
the unit will activate or deactivate a Remote Loopback. The default setting is
DISABLE.
Table 4-5 RTS/CTS Data Rate Delays
DDS Rate (kbps) Normal Delay Long Delay
2.4 8
±
0.4 ms 16
±
0.8 ms
4.8 4
±
0.2 ms 8
±
0.4 ms
9.6 2
±
0.1 ms 4
±
0.2 ms
19.2 1
±
0.05 ms 2
±
0.1 ms
38.4 0.5
±
0.025 ms 1
±
0.05 ms
56 0.4
±
0.02 ms 0.8
±
0.04 ms
64 0.3
±
0.015 ms 0.6
±
0.03 ms