Path Builder S330/S310 Module And Application Overview; Management Cpu Ctx Switch; Management Cpu - 3Com SuperStack II PathBuilder S330 Reference Manual

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Management CPU

CTX Switch
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ATH UILDER
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AND PPLICATION
This chapter describes the operation and data flow for each of the SuperStack II
PathBuilder S330 and S310 WAN access switch (PathBuilder S330/S310 switch)
modules and supported applications. It contains the following sections:
Management CPU
CTX Switch
T1/E1 UNI with IMA Interface
OC3/STM-1 Port
DS3/E3 UNI Modules
Serial Interface
Ethernet Interface (10BASE-T or 10/100BASE-T)
CBR Module
Voice Compression Module
The management CPU provides an intelligent user interface in addition to the
other built-in interfaces available on the PathBuilder S330/S310 switch. It also
monitors and controls the activity on the shelf. These functions include:
Providing a user interface through a VT100 terminal or Ethernet (Telnet).
Programming configurations.
Generating and filtering alarms and transmitting them to the NMS.
Gathering performance-monitoring data.
Checking and assigning an appropriate clock source.
Communicating with other nodes via the management VC channel.
The CTX switch interfaces to all ATM busses in the system. It handles address
translation and switching among seven ATM ports. Up to four ports come from
the T1/E1 UNI with IMAs. The other three ports come from the onboard
OC3/STM-1, the SAR, and expansion slots 7, 8, and/or 9 (the optional modules:
CBR, Voice Compression, four-port IMA, Ethernet 10/100, and DS3/E3 UNI).
Address translation is done via two lookups. The first lookup is a VP lookup (all 8
bits included). If a VP circuit is set up, then a VP translation is done; otherwise, a
second lookup consisting of 2 VPI bits and 8 VCI bits, is done. For VC connections,
any four VPs in the range 0-255 are allowed. Once the VC is found, the CTX
performs the address translation.
S330/S310 M
O
VERVIEW
ODULE