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64200600L1#T-31A © 2002, ADTRAN, Inc. Page 47
Total Access 600R User Interface Guide (UIG)
LAN-
TO
-WAN (O
UT
)
The packets which come out toward the WAN from the 600R can be filtered in three ways:
OUT EXCEPTIONS
This is a list of up to 32 filter entries. The setup is exactly the same as the F
ILTER
/I
N
E
XCEPTIONS
list.
ROUTER>CONFIG>WAN>FRAME RELAY
Frame Relay is a connection-oriented service requiring circuits to be configured by your carrier to
establish a physical link between two or more locations. Multiple virtual circuits (which appear as vir-
tual point-to-point links) can be run through the same physical connection.
There are two types of virtual circuits supported in Frame Relay: Permanent Virtual Circuits (PVC) and
Switched Virtual Circuit (SVC). PVCs are like dedicated point-to-point private lines. Since the physical
connection is always there in the form of a leased line, call setup and tear down is done by a carrier via
a network management system. SVCs require setup and tear down and are generally not available from
Frame Relay carriers. Virtually all Frame Relay communications are implemented using PVCs. The
Total Access 600R supports PVCs only.
A number called the Data Link Connection Identifier (DLCI) identifies each virtual circuit within a
shared physical channel.
Maintenance Protocol
The Frame Relay maintenance protocol is used on the WAN port. The maintenance protocol is used to
send link status and virtual circuit information between Frame Relay switches and other devices (such
as routers) that communicate with them. Possible choices are listed below.
Polling Frequency (5-30)
This parameter is the interval that the Total Access 600R polls the Frame Relay switch using the main-
tenance protocol selected above. The Total Access 600R is required to poll the Frame Relay switch peri-
odically to determine whether the link is active. The value is in seconds and ranges from 5 to 30 seconds
with a default of 10 seconds.
D
ISABLE
(D
EF
)
Turns off packet output filtering. No outgoing packets are blocked.
B
LOCK
A
LL
All outgoing packets to the WAN are blocked except as defined in
the F
ILTERS
/O
UT
E
XCEPTIONS
list.
F
ORWARD
A
LL
All outgoing packets to the WAN are not blocked except as de-
fined in the F
ILTERS
/O
UT
E
XCEPTIONS
list.
A
NNEX
D (
DEF
)
This is an ANSI standard and is the most commonly used standard
in the US.
A
NNEX
A
This is the CCITT European standard.
LMI
This was developed by a vendor consortium and is also known as
the “consortium” management interface specification. It is still
used by some carriers in the U.S.
S
TATIC
This should be selected when there is no Frame Relay switch in the
circuit. The DLCIs are assigned in the DLCI Mapping and must be
the same for the device it will communicate with.