Using The Super; Outer In Your; Ethernet Lan Ports; Wan Port - 3Com SuperStack II User Manual

1

Ethernet LAN Ports

WAN Port

ISDN Port (Model 43x,
53x, 44x and 54x)
U
SING THE
B /R
RIDGE
N
ETWORK
This chapter provides an overview of the networking capability provided
by the LAN, WAN, and serial ports on the SuperStack II NETBuilder SI
bridge/router.
The SuperStack II NETBuilder SI bridge/router provides connection to two
Ethernet LANs using either 10BASE-T or 100BASE-TX Ethernet. Boundary
router models have one port disabled. If you upgrade to full router
software, the second port will be functional.
Leaf node Boundary Routing
bridge/routers.
The WAN port can be an ISDN S/T (model 43x and 53x — no integrated
NT1), ISDN U (model 44x and 54x — integrated NT1), 56/64 Kbps Carrier
Service Unit/Data Service Unit (CSU/DSU) (model 45x and 55x), or
T1/Fractional T1 CSU/DSU (model 46x and 56x) port, depending on the
interface module installed.
For boundary routers, only one serial or WAN port can be active at a time.
The remaining ports are used for back-up only.
The ISDN port provides a basic rate interface (BRI). The BRI delivers two
bearer (B) channels and one delta (D) channel. Each B channel can
transmit up to 64 kilobits per second (kbps); the D channel transmits
information about the call to computers at the switching system at a rate
of 16 kbps. You can use both B channels together for a combined data
rate of 128 kbps, or use each 64 kbps B channel separately.
Some ISDN lines support up to 56 Kbps per B channel. For more
information, contact your ISDN service provider.
S S
UPER TACK

OUTER IN YOUR

®
is not available on the model 5xx
II