OSI/TS Management Programming Manual

ALTER SERVICE Command
Commands and Responses
5–48 056786 Tandem Computers Incorporated
The default is ZSPI-VAL-TRUE . ZSPI-VAL-TRUE specifies 1980 addressing ;
ZSPI-VAL-FALSE, specifies 1984 addressing. This attribute is used only for
X.25 networks.
ZOS4-MAP-ALTER-SERV-L4
is an extensible structured token specifying the desired values for the Layer 4
service attributes. ZOS4-DDL-ALTER-SERV-L4 contains the following fields:
ZSEND-SECUR
specifies the content of the protection field for CR-TPDUs and CC-TPDUs. If
you do not provide a value, the protection field is omitted. Note that not all
transport protocol implementations support this attribute. This parameter
applies to transport classes 1, 2, 3, and 4 only. This value is an ASCII string up
to 16 characters long. The default value is all blanks. To reset this field to its
default value, set the first byte to ZOS4-VAL-SECUR-RESET-BYTE.
ZRECV-SECUR
specifies whether security checking is performed on incoming CR-TPDUs. If
security checking is specified, only incoming CR-TPDUs that have matching
characters in the protection field are accepted. If you do not provide a value,
no security checking is performed. This attribute is valid only when ZCLASS
is ZOS4-VAL-CLASS-1, ZOS4-VAL-CLASS-2, ZOS4-VAL-CLASS-3, or ZOS4-
VAL-CLASS-4. Note that not all transport protocol implementations support
this attribute. This value is an ASCII string up to 16 characters long. The
default value of this parameter is all blanks. To reset this field to its default
value, set the first byte to ZOS4-VAL-SECUR-RESET-BYTE.
ZTCON-PRI
specifies the priority of the transport connection. This attribute is used to
reassign transport connections after errors have occurred. Because an
agreement has not yet been reached among the implementors concerning this
attribute, Tandem OSI does not currently process this field. The values range
from 0 through 32767 (0 being the highest priority). The default priority is 0.
ZL4-WIN
specifies the initial credit allocation to the remote transport entity. This is the
number of TPDUs that can be sent by the remote transport entity without
acknowledgment. This attribute is valid only when ZCLASS is ZOS4-VAL-
CLASS-1, ZOS4-VAL-CLASS-2, ZOS4-VAL-CLASS-3, or ZOS4-VAL-CLASS-4.
When ZCLASS is 1, you must specify 0 or 1 (a value of 0 is interpreted as 1).
For transport class 1, the use of values 2 through 15 could lead to a deadlock
situation when the sending transport entity waits for the acknowledgment of
each DT-TPDU before it sends the next one. The range of values is 0 through
15. The default value is 4.