Enterasys Networks CSX6000 - Manual (Page 59)

Central Site Remote Access Switch 59
H ARDWARE O VERVIEW
System Adapters
The Ethernet-1 incorporates an Intel i960 RISC processor executing at 16Mhz. When coupled with
the integrated, high-performance Ethernet controller, the adapter can operate at the maximum
speed of the LAN (10Mbps). This is equivalent to a packet rate of 14,800 packets per second (pps).
The adapter has 2MB of DRAM, which allows it to execute sophisticated filtering and forwarding
functions. The adapter maintains a large table of over 1000 entries for local MAC addresses.
The front of the adapter has a 15-pin AUI connector. This provides direct connection for an 802.3
transceiver, which accommodates 10Base5, 10Base2, or 10BaseT transceiver connections.
H ARDWARE C HARACTERISTICS
Processor: i960
Speed: 16Mhz
Ports: 1
Port Type: 15pin AUI
MTBF: 75000hours
MTTR: 0.25hour
LAN C ONNECTION
The CyberSWITCH connects to an Ethernet LAN using a 15-pin AUI connector. A Media Access
Unit (MAU) is required for each LAN port. (Note that the MAU is NOT normally included with the
CyberSWITCH.) Three options are supported for connection to the Ethernet LAN:
•
10Base5 MAU (Thick Ethernet)
• 10Base2 MAU (Thin Ethernet)
• 10BaseT MAU (Twisted Wire Ethernet)
The MAU's 15-pin connector can directly attach to the Ethernet LAN Adapter, or an AUI cable can
be used between the Ethernet LAN Adapter and the MAU. The MAU and AUI cables are NOT
normally supplied.
B ASIC R ATE A DAPTERS
BRI-4 B ASIC R ATE A DAPTER
The BRI-4 provides four basic rate ports. Each port provides a standard S/T interface for
attachment to an ISDN basic rate line. The BRI-4 can take advantage of services such as NTT's INS-
64, BOC's Centrex ISDN Basic Rate, or PBX's basic rate lines.
Basic rate is a communications service that provides two 64Kbps B channels for data and a 16Kbps
signaling D channel (2B+D). The CyberSWITCH uses the 2 B channels for switched connections to
carry device data. Both B channel connections can be active at the same time, to the same or
different destinations.
The BRI-4 provides four 4-wire S/T interfaces with separate RJ-45 connectors. It uses external NT1s
(when necessary) to connect to the public ISDN. You do not need external ISDN terminal adapters.
In Japan, NTT provides a dedicated service called High Speed Digital-I that uses the same Basic
Rate Adapters. This can be either a 64Kb or 128Kbps leased circuit. BRI-4 supports up to four HSD-
I circuits.