ESR Series Routers Operation Manual 7
2 PRODUCT DESCRIPTION
2.1 Purpose
ESR series devices are the high performance multi-purpose network routers. Device combines
traditional network features with a complex multi-tier approach to routing security, and ensures robust
corporate environment protection.
Device has a built-in firewall that enables protection of your network environment and supports
latest data security, encryption, authentication and anti-intrusion features.
Device contains software and hardware means of data processing. Top performance is achieved
through optimal distribution of data processing tasks between different subsets of the device.
2.2 Functions
2.2.1 Interface functions
Table 2.1 lists interface functions of the device.
Table 2.1 – Device interface functions
Cable connection
polarity detection
(Auto MDI/MDIX)
Automatic cable type detection—crossed or straight.
– MDI (Media-Dependent Interface—straight)—cable standard for
connection of terminal devices
– MDIX (Media-Dependent Interface with Crossover—crossed)—cable
standard for connection of hubs and switches
Backpressure routing
support
(Back pressure)
The backpressure routing method is utilized in half-duplex connections for
management of data streams, coming from the opposite devices, by means of
collisions. This method allows to avoid buffer overruns and the loss of data.
Flow control
(IEEE 802.3X)
Flow control allows to interconnect the low-speed and the high-speed devices. To
avoid buffer overrun, the low-speed device gains the ability to send PAUSE
packets, that will force the high-speed device to pause the packet transmission.
Link aggregation allows to increase the communication link bandwidth and
robustness.
Router supports static and dynamic link aggregation. For dynamic aggregation, link
group management is performed via LACP protocol.
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