High-Performance Transmission Subsystem (HPTSS)
The HPTSS consists of up to two high-speed scanners (HSSs).
A HSS consists of one communication scanner processors (CSP), associated with
a front-end scanner high-speed (FESH).
Communication Scanner Processor
The HPTSS CSP is the same as the LSS CSP, but is loaded with different
microcode.
The high-speed scanner accepts a clear channel (without channel and subchannel
TDM framing) at speeds up to 1544 megabits per second for T1 and up to 2048
megabits per second for CEPT. The high-speed scanner is used for intermediate
routing node (IRN) support of high-speed line to another communication controller.
This connection must be SDLC, duplex, point-to-point, nonswitched line traffic. This
high-speed scanner can also be used for boundary network node (BNN) support.
The HPTSS supports CCITT V.35 and X.21 interfaces, but only one interface may
be activated at a time (the NCP load module determines which interface is to be
activated).
Front-End Scanner High-Speed
The FESH provides 'bit service' (serialization/deserialization) and 'line service'
(supports link protocols and line interface).
The FESH may interface with:
Network channel terminal equipments (NCTEs)
Data service unit/channel service units (DSU/CSUs)
Limited-distance modems (LDMs)
Chapter 4. Controller Description
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