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C122-B001-02EN
5-9
5.2 Main GSWB Functions
• Support functions
z
Back pressure
Back pressure is a method for retaining transmission of a sender by generating a
dummy collision. Back pressure can be specified for half-duplex communication.
z
PAUSE frame function
The PAUSE frame function sends a PAUSE frame using the MAC control
mechanism.
A PAUSE frame can be specified for full-duplex communication and supports the
following three modes.
- Two-way control (Symmetric)
- One-way control (Asymmetric: accept)
- One-way control (Asymmetric: transmit)
• Restrictions
The restriction list for communication speeds and communication modes is shown
below.
Table 5.9 Flow control and restriction list
Y: Supported, N: Unsupported
Remark: Both functions cannot be executed at the same time.
Communicatio
n speed
Communication mode
Half duplex Full duplex
Back pressure
10 bps
Y
N
100 bps
Y
N
1000 bps
Y
N
PAUSE function
10 bps
N
Y
100 bps
N
Y
1000 bps
N
Y
Содержание PRIMEQUEST 440
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