
SPEED-DSL 4.6
SPEED-DSL 4.6/22.10.2004 page
4
1.3.1 Bandwidth
Switches #1-3: SPEED-DSL 4.6-P and SPEED-DSL 4.6G-P ONLY
Switches 1-3 on the SPEED-DSL 4.6-P work in tandem with one another to provide eight
bandwidth options for the two SDSL ports; bandwidth for the two ports cannot be
configured individually. Distance capabilities listed in the following table assume the use of
26 American Wire Gauge (AWG) cable. Connections made with cable of a lesser gauge
(e.g., 24 AWG) will link up at greater distances. Your SPEED-DSL 4.6 may not link up if
the cable is in poor condition or if the cable distance is greater than a particular bandwidth
will support; if link IS achieved under such conditions, traffic quality may be affected (e.g.,
packets may be dropped).
BANDWIDTH AND DISTANCE OPTIONS
Switch Position Bandwidth (kbps) Distance
1 2 3
Single Line
Connection
Double Line
Bonded
Connection
Feet Meters
down down down 2,320 4,640 11,000 3,353
down down up 2,064 4,128 11,900 3,627
down up down 1,552 3,104 12,600 3,840
down up up 1,040 2,080 15,500 4,724
up down down 784 1,586 16,000 4,877
up down up 528 1,056 17,900 5,456
up up down 400 800 18,900 5,761
up up up Adaptive* Adaptive* varies varies
*Adaptive mode allows the SPEED-
DSL 4.6-P to train up to the best
possible speed supported by the
SPEED-DSL 4.6-P, the remote modem
to which it's connected, and the
copper cable pair(s) connecting the
two. The maximum reachable
distance for a single line SPEED-DSL
4.6-P connection in Adaptive mode is
24,700 feet (at 144 kbps).
N
OTE
Bandwidth cannot be configured on the SPEED-DSL 4.6-S; subscriber units
determine bandwidth via communication with their partner SDSL provider
unit.
1.3.2 Ethernet Duplex Mode
Switch 4: both provider and subscriber units
The Ethernet link can be configured at either Full Duplex or Half Duplex mode. Although
both ends of the ETHERNET connection must have the same duplex mode configuration,
it is not necessary for partner providers and subscribers to be configured the same; duplex
mode does not apply to the SDSL link.
SWITCH 4 CONFIGURATION
down Half Duplex
up Full Duplex
1.3.2.1 Half Duplex Ethernet
Receive and transmit functions are mutually exclusive; data transmission occurs in
only one direction at a time. Packet collisions are not unusual.
1.3.2.2 Full Duplex Ethernet
The Ethernet line can recieve and transmit simultaneously, effectively upping
aggregate bandwidth from 10 mbps to 20 mbps and preventing packet collisions.
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