R2511-HP MSR Router Series Terminal Access Configuration Guide(V5)

establishing a connection between the initiator and the receiver. Each terminal supports up to eight

virtual type terminals (VTYs) using these access types, and supports switchover between the VTYs.

RTC terminal access is used to monitor terminal data. It is initiated by a router and received by another

router. Only RTC terminal access supports UDP connections with synchronous terminals.

Support for features depends on the terminal access type. For more information, see "Terminal access

ature list" and "Terminal access features."

TTY terminal access

The initiator and receiver of TTY terminal access are a router and an FEP respectively. The service

terminal is connected to the router through an asynchronous serial interface. The router is connected to

the FEP through a network. Application services run on the FEP. The FEP interacts with the router through

the ttyd program, and the router pushes the service display to the service terminal. The router transports

data transparently between the connected service terminal and FEP to implement service interaction and

processing.

The initiator and receiver programs of TTY terminal access are developed by HP. TTY terminal access

implements the fixed terminal number function and offers many enhanced functions such as dynamic

multi-service switching, real-time screen saving, terminal reset, and data encryption. The FEP provides

professional terminal management software. The combination of TTY terminal access and routers makes

remote offices possible and implementation of IP telephony easier, offering a solution for establishing

highly efficient networks with diverse functions.

Telnet terminal access

The initiator and receiver of Telnet terminal access are a router and an FEP respectively. A service

terminal is connected to the router (Telnet client) through an asynchronous serial interface. The router is

connected to the FEP (Telnet server) through a network. Application services run on the FEP. The FEP

interacts with the router through standard Telnet, thereby implementing data exchange between the

terminal and the FEP.

ETelnet terminal access

The initiator and receiver of ETelnet terminal access are a router and an FEP respectively. A service

terminal is connected to the router (ETelnet client) through an asynchronous serial interface. The router is

connected to the FEP (ETelnet server) through a network. Application services run on the FEP. The FEP

interacts with the router through an encrypted Telnet connection to further exchange data with the

terminal.

In addition to the functions supported by Telnet terminal access, ETelnet terminal access implements data

encryption and terminal number binding to improve security.

SSH terminal access

The initiator and receiver of SSH terminal access are a router and an FEP respectively. A service terminal

is connected to the router (secure shell) through an asynchronous serial interface. The router is connected

to the FEP (SSH server) through a network. Application services run on the FEP. The FEP interacts with the

router through standard SSH.

RTC terminal access

The initiator and receiver of RTC terminal access are both routers. RTC terminal access is another typical

application of terminal access. It interconnects a local terminal and a remote terminal through routers for

data exchange and data monitoring. RTC terminal access supports synchronous mode and

asynchronous mode.