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Cisco offers two options in second-generation Token Ring switching: the Catalyst 3900 Token Ring switch and the Catalyst 5000 Token Ring module. This chapter provides a brief overview of each switch and a list of the features and specifications of each switch.
The Catalyst 3900 is a Token Ring switch ideally suited for desktop connectivity. The Catalyst 3900 comes standard with 20 fixed ports and an expansion slot that can accommodate two expansion modules. It also offers an optional Stack Port module that enables up to eight units to be stacked together using the Catalyst Matrix switch.
The Catalyst 3900 offers the following options for expanding beyond the base 20 ports:
An ASIC design results in low-latency, wire-speed switching of unicast, multicast, and broadcast frames at either HDX or FDX speeds, regardless of whether they are source-route bridged, source-route transparently bridged, or source-route switched. Adaptive cut-through mode switching optimizes performance while providing protection from network errors by automatically switching to store-and-forward mode when errors reach a user-defined threshold.
The Catalyst 3900 switch provides a wide range of connectivity options for maximum flexibility. Connecting an MAU, server, or end station is easy because the Catalyst 3900 enables direct station attachment as well as RI/RO connections to scale ring segment size. Each port supports DTR, the IEEE standard that defines direct station attachment at 4, 16, or 32 Mbps. Furthermore, ports 19 and 20 and any of the ports of the fiber expansion module support RI/RO.
The shielded RJ-45 ports support both 150-ohm shielded twisted-pair (STP) and 100-ohm unshielded twisted-pair (UTP). There is no need for external media filters; nor is there a requirement for baluns to do impedance matching for different cable types.
Table 2-1 lists the Catalyst 3900 features and specifications.
Performance | Latency: Less than 45 microseconds for all frame sizes |
| Throughput: Media speed on all interfaces | |
Buffers and addressing | Buffers: 1 MB of DRAM per group of 4 ports |
| Addressing: 10,000 addresses per system, local cache of up to 6500 addresses per group of 4 ports | |
System interfaces | 20 shielded Token Ring ports for 150-ohm STP or 100-ohm UTP connectivity |
| Expansion slot accommodating up to two expansion modules | |
| Expansion modules include a four-port fiber module, a four-port copper module, a two-port ISL uplink, and an ATM OC-3 uplink | |
| One rear stack port for an optional stack port module providing a 140-Mbps FDX link between back-to-back switches or between the Catalyst 3900 and the Catalyst Matrix switch for configurations requiring up to 8 units in a stack | |
| 9-pin EIA/TIA-232 interface for local console or modem connectivity | |
Switching features | SRB, SRT, and source-route switching |
| Adaptive cut-through mode switching | |
| Automatic 4/16/32-Mbps speed adaptation | |
| Automatic shared and dedicated adaptation | |
| Two priority queues for multimedia traffic | |
| TokenChannel switch interconnect | |
| MAC address, DSAP, and SNAP type filters | |
| ARE reduction | |
| Explorer rate protection | |
| IEEE and IBM Spanning Tree Protocols | |
Standard MIBs supported | Management Information Base (MIB) for network management of TCP/IP-based internets:
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Private MIBs supported | Catalyst 3900 Enterprise MIB |
| Cisco VLAN Trunking Protocol MIB v2 | |
| Cisco Discovery Protocol MIB | |
Monitoring support | CWSI graphical user interface (GUI) management
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SPAN | |
| TFTP and BOOTP | |
| Menu-driven interface (via console port or telnet) | |
| Password-level security | |
Physical Specifications | Dimensions (H x W x D): 3.4 in. x 17.4 in. x 15.3 in. (8.6 cm x 44.2 cm x 38.7 cm) |
| Weight: 16-18 lb (6-6.7 kg), depending on configuration | |
| Mounting: 19-in. (48.26 cm) 2U rack compatible | |
Power Requirements | Power: 90-264 VAC autosensing (single supply) |
| Frequency: 47-63 Hz | |
| AC current rating: 1.5A at 115V; 0.75A at 230V | |
| Thermal dissipation: 150W maximum; 512 BTUs/hr | |
Environmental Conditions | Operating temperature: 50 to 104°F (10 to 40°C) |
| Nonoperating temperature: -13 to 158°F (-25 to 70°C) | |
| Operating humidity: 8 to 80% (noncondensing) | |
| Nonoperating humidity: 8 to 90% at 45°C | |
| Storage altitude: 40,000 ft | |
Electromagnetic emissions certifications | FCC Class A/B-UTP |
| CE Declaration of Conformity to the EMC Directive-Class B with Unshielded or Shielded Cables | |
| VCCI Class II (B) Certification (for Japan) | |
| AS/NRZ 3548 (1992 Class A/B Certification for Australia) | |
| ICES-003 Class A/B (for Canada) | |
Safety certifications | UL 1950, third Edition without D3 deviations |
| CUL to CAN/CSA 22.2 Number 950 | |
| CE mark to the Low Voltage Directive (EN60 950, 1992 Amendments 1 and 2) | |
| Certified Body (CB) report to IEC 950, third Edition |
The Catalyst 5000 Series Token Ring module is a switching module that can be used with any of the Catalyst 5000 series switches. The Token Ring module is available in fiber or copper. The copper Token Ring module provides 16 RJ-45 ports. The fiber Token Ring module provides 16 ST-type ports. On all Catalyst 5000 series switches interface slot 1 is reserved for the supervisor engine module. The maximum number of Token Ring ports varies depending on the model of Catalyst 5000 switch as follows:
As in the Catalyst 3900, an ASIC design results in low-latency, wire-speed switching of unicast, multicast, and broadcast frames at either half- or full-duplex speeds, regardless of whether they are source-route bridged, source-route transparently bridged, or source-route switched.
Like the Catalyst 3900, the Catalyst 5000 Series Token Ring module supports IEEE 802.5r, which defines standards for the direct attachment of end stations to the switch as well as for the transmission of data at half-duplex (4/16 Mbps) and full-duplex (32 Mbps) speeds. The fiber Token Ring module also allows the ports to operate in RI/RO mode.
The shielded RJ-45 ports support both 150-ohm STP and 100-ohm UTP. There is no need for external media filters and there is no requirement for baluns to do impedance matching for different cable types.
Table 2-2 lists the Catalyst 5000 Series Token Ring module features and specifications.
| Performance | Throughput: Media speed on all interfaces |
System interfaces | 16 Token Ring ports for UTP/STP connectivity |
| 16 Token Ring ports for multimode 62.5-micron fiber connectivity | |
| Autosense 4/16/32 Mbps on all ports | |
| Switch ports can function as concentrator or station ports | |
Switching features | SRB, SRT, and source-route switching |
| Automatic 4/16/32-Mbps speed adaptation | |
| Automatic shared and dedicated adaptation | |
| Two priority queues for multimedia traffic | |
| MAC address, DSAP, and SNAP type filters | |
| ARE reduction | |
| IEEE and IBM Spanning Tree Protocols | |
Standard MIBs supported | MIB for network management of TCP/IP-based internets:
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Private MIBs supported | Cisco VLAN Trunking Protocol MIB v2 |
| Cisco Discovery Protocol MIB | |
Monitoring support | CWSI GUI management
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TFTP and BOOTP | |
| Command line interface (via console port or telnet) | |
| Password-level security and Terminal Access Controller Access Control System (TACACS) | |
Physical specifications | Single slot dimensions (H x W x D): 1.17 in. x 14.4 in. x 16.0 in. (2.97 cm x 36.58 cm x 40.64 cm) |
| Weight: 3.9 lb (1.45 kg) | |
Electromagnetic emissions certifications | FCC 15J Class A |
| VCCI CE II | |
| CE Mark | |
| EN 55022 Class B | |
| CISPR 22 Class B | |
Safety Certifications | UL 1950 |
| EN 60950 | |
| CSA to C22.2 No. 950 | |
| IEC 950 |
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