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Functional Descriptions

VMDS-10492 VSC7440 Datasheet Revision 4.2

233

•

Delay Triggered Injection (DTI) - A sequence of frames, including configurable delay between

frames, is injected. Delay triggered injection can be combined with TTI, such that DTI is used to

inject a (high) background load (imitating normal user traffic), and TTI is used to inject OAM PDUs

for measuring IR, FLR, FTD, and FDV. AFI supports up to 16 active DTI frame sequences at a time.

3.25.1

Injection Tables

The main tables used to configure frame injection are frame table, DTI table, and TTI table.

Injection frames for both TTI and DTI are configured in the frame table. The frame table itself does not

hold the frame, but rather a pointer to where the frame is located in the buffer memory within QSYS.

For DTI, frames can be configured into a linked list of frames to be injected. Each frame in the linked list

may be configured to be injected multiple times before proceeding with the next frame in the chain. Each

frame in the sequence is followed by one or more delay entries, specifying the delay between injections.

Timers for each TTI frame are configured in the TTI table. TTIs are always single frame injections, so the

inj_cnt and next_ptr fields in the frame table are unused for TTI. Delay entries are not used for TTI.

The TTI calendar controls the frequency with which different parts of the TTI table are serviced.

Figure 70 •

Injection Tables

...

Injection Frame Table

inj_cnt

...

Second frame. To be injected 3 times.

First frame of OoS injection frame sequence

Fifth and last frame.

next_ptr

DTI Table

port_num ena

...

first_frm_ptr

Delay Triggered Injection of

sequence of 5 frames on port 5

...

TTI Table

port_num

frm_ptr tick_idx tick_cnt

jitter

...

n/a

...

n/a

Timer configuration

Delay

TTI Calendar

end_ptr

Delay between the 3 injections of previous frame in

chain.

start_ptr

TTI Ticks

Base Tick

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