Tahoe 1701, User Manual

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2. Interfaces
2.1. G.703
The G.703 interface is equipped with a 8-pin RJ-45 connector.
Although the G.703 standard does not specify the pinout, one used in
Tahoe devices is most widely used and a straight patch-cord may be used
to connect the router to an external device. Anyway the pinout should be
carefully checked before connecting.
The RX+ pin of the router should be connected to the TX+ pin of
the other device, the RX- pin to the TX- pin, TX+ to RX+ and TX- to RX-
2.2. Ethernet
The Ethernet interface is used to connect the router to the Local
® ®
Area Network. In case of Tahoe 1701 and Tahoe 1741 routers it is
a single RJ-45 connector with four LEDs:
¡
LNK - LAN Link, signals a proper connection to the LAN
¡
COL - Collision, signals an attempt to transmit to the LAN while
another device also sends data
¡
LRX - LAN Receive, flashes, when data is received from the LAN
¡
LTX - LAN Transmit, flashes, when data is transmitted to the LAN
A router should be connected to an Ethernet switch or a hub using
a straight patch-cord or to a PC, another router or an uplink port in a
switch using a crossed-over one. After connecting a LED named “LAN
Link” should be lit.
® ®
In case of Tahoe 1708 and Tahoe 1748 routers an 8-port
switch is available instead of a single Ethernet interface. Each switch port
has three LEDs associated to it:
¡
10/100Mbps - when lit, signals a 100Mbps connection
¡
LINK/ACTIVITY - when lit signals a proper connection to the
2
The system firmware is stored in the Flash memory - it is possible
to update it using the TFTP protocol. The configuration is stored in the
EEPROM memory.
3
2.1
Pin Signal
1 Rx+
2
3
4
5
6 Rx-
-
Tx+
Tx-
-
7
8
-
-
2
2.2