Cabletron Systems MMAC-Plus 9F116-01, User Manual, Page: 152 / 420

8-10 FRX/FRM 3. 3 User G uide, Rev 04
L2DatMode
determines whether transmission can be in one (alternate) or two (simultaneous) direc-
tions at the same time.
LLC2 Parameters
Local SAP Address
is the remote service access point (SAP) address used to connect the PU to the host.
This parameter is relevant only in a connection to a 3174 or AS/400-type setup where
a specific source SAP address is required. If the LLC2 session will be run over a native
LLC2 frame relay interface, the parameter will be ignored.
Local MAC Address
identifies the PU to the host. Like the local SAP address, this parameter is relevant
only in a connection to a 3174 or AS/400-type setup where a specific source MAC
address is required. If the LLC2 session will be run over a native LLC2 frame relay
interface, the parameter will be ignored.
IDBLK
is used in conjunction with
IDNUM
in generating the Node field in an XID frame
(format 0 or 3) to establish a link station connection to the host. A further explanation
is provided under "
IDNUM
."
IDNUM
is used in conjuction with
IDBLK
in generating the Node field in an XID frame (format
0 or 3) to establish a link station connection to the host. If both
IDBLK
and
IDNUM
are
set to
0
, the Node field of the XID will be provided by the attached SDLC device. (The
node will send an XID command to the remote node to indicate that the SDLC device
should be polled for an XID.)
T1
is the Reply Timer, which is used to detect the failure to receive a required acknowl-
edgment or response from the remote link station. The link station will start the timer
when it transmits one of these:
●
an Information LPDU (LLC protocol data unit).
●
a Command LPDU with the P bit set to
B'1.'
(If this LPDU is sent while the timer
is already running, the link station will reset and restart it.)
The link station will reset
T1
when it receives one of these:
●
A REJ (Reject) LPDU, provided a Command LPDU with P bit set to
B'1'
is not
outstanding.
●
A Response LPDU with the F bit set to
B '1.'
●
An Information or Supervisory LPDU with an N
R
greater than the last N
R
received and less than or equal to the line station's V
S
, provided a Command
LPDU with P bit set to
B'1'
is not outstanding.
If additional LPDUs are set from the remote link station after the local station has reset
T1
, the timer will be restarted if acknowledgments of or responses to those LPDUs are
outstanding. If no acknowledgments/responses are outstanding, the link station will
start the inactivity timer. (See "
Ti
" later.)