Cabletron Systems Netlink FRX4000 User Manual - page 191
Configuring BSC Batch
11-5
Blocked Port Flag
will cause the port to be enabled (
N
) or disabled (
Y
) at node IPL. The port will remain
in that state until this parameter is changed or an on-line enable (
[B], [B], [C]
from the
Main Menu) or disable (
[B], [B], [A]
from the Main Menu) is performed.
Line Speed
is the data transmission rate in bits per second, and the clock speed on a serial port
when the port is a physical DCE (i.e., the attached I/O cable is DCE). If this port is a
physical DTE, specify the line speed that matches (as closely as possible) that of the
device connected directly to the port.
Retransmission Period
is the length of time before the node will transmit an I-frame if the previous trans-
mission is not acknowledged. If the period expires, the timer will be reset and a super-
visory frame will be transmitted demanding immediate acknowledgement. The
Maximum Retransmissions
(see that entry) counter will also be incremented.
The default value of
2000 ms
allows avoidance of unnecessary retransmission of
frames that have merely been delayed.
Maximum Retransmissions
is the maximum number of times the node will attempt to send an I-frame after a
Retransmission Period
expiration. A larger value for this parameter increases the prob-
ability of an eventual successful transmission, but a smaller value permits faster
detection of a permanent error condition.
Maximum Bytes per Frame
is the maximum frame size that will be transmitted on the port.
Generate Clock
specifies whether the port will generate the clock necessary to synchronize traffic over
the link. If the port is a physical DCE (determined by the port's I/O cable interface),
specify
Y
, since the physical DCE generates clock. If the port is DTE, specify
N
.
Rcv Clock (TT) from DTE
allows the clock to be looped back from the DTE using the TT (Terminal Timing)
signal, which can be helpful on high-speed lines. Generally, if the local interface is
physical DCE and the line speed is above 256 Kbps, this parameter should be set to
Y
.
(Make sure the remote DTE is configured to provide the terminal timing.)
EBCDIC
stands for "Extended Binary Coded Decimal Interchange Code." Specifying
Y
requires that all devices on a line use the same character set for successive session
polls. It is activated after a session is over; i.e., an EOT (End of Transmission) is suc-
cessfully transmitted down the line. On expiry, a
General Poll
is transmitted, except
under certain special conditions. The timer is deactivated at
Link Down
.
Transparent Text Supported
causes (if
Y
) all characters transmitted, including control character sequences, to be
treated as data. This is useful for transmitting binary data, machine language computer
programs, etc., without special coding.
Data-link control character sequences transmitted during transparent mode must be
preceded by character 1/0 (DLE) in order to be recognized as control characters.