參數(shù)資料
型號(hào): IBM3209K3114
廠商: IBM Microeletronics
英文描述: IBM Packet Routing Switch Serial Interface Converter(IBM封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
中文描述: IBM的分組路由交換機(jī)串行接口轉(zhuǎn)換器(IBM的封裝路線選擇開關(guān)串行接口轉(zhuǎn)換器)
文件頁數(shù): 42/152頁
文件大?。?/td> 2390K
代理商: IBM3209K3114
IBM3209K3114
IBM Packet Routing Switch Serial Interface Converter
Advance
Functional Description
Page 32 of 142
prssi.01
July 12, 2000
The data transfer must have been stopped for long enough and in such a way that all buffers are empty
before the loopback is initiated. If the buffers are not empty, reset the path on which the loopback is to be
performed. To execute the loopback, the converter must be set in OBFC mode to avoid modifying the packet
qualifier byte.
3.7.1.3 Protocol Engine (PE) External Loopback
The PE bus is wrapped via the DASL interface. The switch is disconnected from the converter. A wrap plug is
connected to the DASL port corresponding to the path to be tested.
Note:
The switch plane (or substitute) clock must be selected.
The following operational sequence must be performed to execute PE external loopback:
1. Reset the path to be set in loopback.
2. Force X or Y switch plane in service.
3. Select the clock source (switch or microprocessor) for the plane to be wrapped.
4. Synchronize the DASL.
5. Initiate the traffic from the PE.
The PE external loopback can be performed without switch clock by using the microprocessor clock and
properly programming the PLLs (the PLL must be reset to acquire its newly programmed value). In all cases
the objective is to be in the frequency range of 100 - 125 MHz to allow DASL operation.
3.7.1.4 Switch X/Y Loopback
Switch X/Y loopback provides a connection from the egress input to the ingress output to the ingress input
through either the X or the Y path. During this test RXENB
is de-asserted so the PE cannot send data.The
result of this test is obtained through the switch control.
Figure 19: Protocol Engine External Loopback Through Path X
Protocol
Engine
DASL
IBM Packet Routing Switch Serial Interface Converter
X/Y
X/Y
Y
X
DASL
External Wrap
Ingress
Egress
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