Verilink PRISM 4101 (34-00230) Product Manual - Manual (Page 28)

16 C HAPTER 3: F RONT P ANEL I NTERFACE
Timing
The PRISM 4101 can source its timing from three choices. With NETWORK
selected, timing is derived from the network recovered clock (the normal DDS
mode). With DTE selected, the unit synchronizes to the clock recovered from the
DTE port (DTE clocking is supported only in Standard mode). With INTERNAL
selected, the internal oscillator’s frequency standard is used for all timing.
Alarm Thresholds
The unit can be programmed to generate an alarm condition based on a specific
level of performance degradation. Alarm thresholds are set for periods of 1, 2, 3, 4,
5, 10, 20, and 30 consecutive seconds for the OOS, OOF, and LOS parameters. A
field set to [---] causes the unit not to alarm on that statistic. To effectively disable
alarm reporting, set all fields to [---].
OOS - Sets the Out of Service seconds threshold. This occurs when the OOS code
is received from the DDS network. The default value is disabled [---].
LOS - Sets the loss of signal seconds threshold. The default value is 5.
OOF - Sets the Out of Frame seconds threshold. This occurs on receipt of OOF
code from the DDS network. The default value is disabled [---].
ART - Sets the alarm reset timer. The setting determines when the Alarm
Indication/Contacts are cleared after the last error. The choices are 0, 10, 20, 30,
60, 90, 100, 200, 300, 400, 500, 600, 700, 800, and 900 seconds.
DTE Configuration The DTE Configuration menu sets the operating parameters for the data port (V.35
or RS-232). Figure 3-10 displays the menu structure.
Figure 3-10 DTE Configuration Menu Structure
Mode
The unit can operate in two general modes (sync and async). When a unit is
configured for asynchronous DTE data, it operates in the TxPORT proprietary
mode and requires another PRISM 4101 on the remote end. The supported
asynchronous DTE rates are listed in Table 3-1. The following parameters must be
set for asynchronous operation; the number of async bits per character is 8, the
number of stop bits is 2, and parity is none.
Sync
Async
2.4K 4.8K
9.6K 19.2K
38.4K
54K 56K
57.6K
62K 64K
RS-232
V.35
Off
10 sec
30 sec
60 sec
Force On
Idle>
Off
Force On
Normal
Off
On
Normal
Long
Enable
Disable
Enable
Disable
Force On
Test>
Off
V.54
Loop
DTR
Alarm
RTS/
CTS
Circuit
Assur.
RTS DCD DSR Anti-
Stream
Timer
Interface Rate Mode