描述
从结构上分，PLC分为固定式和组合式（模块式）两种。固定式PLC包括CPU板、I/O板、显示面板、内存块、电源等，这些元素组合成一个不可拆卸的整体。模块式PLC包括CPU模块、I/O模块、内存、电源模块、底板或机架，这些模块可以按照一定规则组合配置。
Nortel Norstar CICS Rls 4.1 with CID Phones and V/Mail
Nortel compact ics Office Phone System w/(4) T7316E VM
Nortel Norstar CallPilot Call Pilot 150 Voicemail
Nortel BCM Expansion Cabinet With Redundant Power Suppl
Nortel Business Phone System Package #1 w/ 1yr Warranty
NORTEL AS3104004 20-PORT 10/100 CENTILLION SWITCH
JDSU Nortel DBR SG-DBR Tunable Laser Module, C-Band
Nortel 824KSU with Flash Voicemail and (11) Phones
CallPilot 150 CP150 64-MB Call Pilot Voicemail Nortel
