Avaya 8800 Installation Manual page 34

Avaya Ethernet Routing Switch 8800/8600 module fundamentals
For general information on R modules, and information on the supported switch fabric and
power supplies, see
The following figure shows the 8648GTR.
Figure 4: 8648GTR module
On the 8648GTR module, ports operating at 100 Mbps support a maximum frame size of 9188
bytes. Ports operating at 10 and 1000 Mbps support 9600 byte frames.
The 8648GTR module ports support the IEEE 802.3 1998 Clause 28 Auto-Negotiation
standard. Each port can operate in full- or half-duplex mode. When a port is connected to
another device that also supports the IEEE 802.3 1998 Clause 28 Auto-Negotiation standard,
the two devices negotiate the highest possible data rate and the duplex mode of operation.
The 8648GTR module further supports Custom Auto-Negotiation Advertisements (CANA). For
more information about CANA, see Avaya Ethernet Routing Switch 8800/8600 Configuration
— Ethernet Modules, NN46205-503.
The 8648GTR module ports support Auto-MDIX. Auto-MDIX refers to automatic detection of
the connection type (straight-through or crossover) of an attached cable. When Auto-MDIX is
active, either a straight or a crossover cable can be used to provide a connection to a port, and
the interface automatically corrects any incorrect cabling, thereby removing the need for
crossover cables to interconnect switches.
Auto-MDIX is automatically enabled when autonegotiation is enabled. If autonegotiation is
disabled, then Auto-MDIX is not active.
The following figure shows the location of the 8648GTR module LEDs.
34 Installation — Modules
R modules on page 25.
Comments? infodev@avaya.com
October 2014