
Customizing Synchronous and Asynchronous Interfaces
114078 Rev. A 5-19
The default is 1 frame. You can set the Transmit Window size to a value from 1
through 7 I-frames.
Setting Minimum Frame Spacing
Minimum Frame Spacing specifies the minimum number of flags transmitted
between adjacent frames on this interface.
The interface transmits 1 frame by default. You can set frame spacking to a value
from 1 through 32 flags for the interface.
Specifying Local and Remote Point-to-Point Addresses
According to convention, one end of a point-to-point circuit is designated DCE
and is assigned an address of 01; the other end of the circuit is designated DTE
and is assigned an address of 03.
If you configure a device at one end with a local address of 1 (DCE) and remote
address of 3 (DTE), you must configure the device at the other end with a local
address of 3 (DTE) and remote address of 1 (DCE). The remote and local
addresses must be 1 (DCE) or 3 (DTE) if you configure X.25 on a line.
Conventional addressing, however, is inadequate in the case of multiple
communication channels enabled by a common satellite link. As illustrated in
Figure 5-1, a common satellite relay link provides a virtual point-to-point link
between routers A and X, B and Y, and C and Z.
Conventional addressing designates routers A, B, and C as DCE (address = 01)
and routers X, Y, and Z as DTE (address = 03). If router A transmits a frame
across the virtual point-to-point circuit to X, X (the intended recipient), Y, and Z
all monitor the satellite broadcast. Because X, Y, and Z all perceive a properly
addressed frame, all three accept delivery and attempt to process the frame
contents, with unpredictable results.
Site Manager: Transmit Window Size parameter: page A-62
Site Manager: Minimum Frame Spacing parameter: page A-62
Comentarios a estos manuales