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Cisco IGX 8400 Series Switches

Universal Switching Module (UXM)

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Data Sheet

Universal Switching Module (UXM-E)


The Universal Switching Module (UXM-E) for the Cisco IGX 8410, IGX 8420, and IGX 8430 wide-area switches provides standards-based, full-featured ATM interfaces that meet current and future wide-area networking ATM requirements. The UXM-E leverages -industry-leading technology with Stratm technology; a set of custom ASICs to deliver high-performance, high-density ATM solutions for wide-area networks. With the UXM-E, Cisco offers a solution for building wide-area ATM networks that is unique in this class of switches.

Key Features

Next-Generation Technology for Performance and Scale

The UXM-E uses a 64-bit RISC processor along with the Stratm ASICs to support the following functions:

  • Trunks (IGX-to-IGX/BPX/MGX) and ports (IGX-to-CPE) interfaces on the same card

  • ATM Forum, ITU-T, and ANSI standards-based UNIs and NNIs with flexible port densities:

    • Two or four OC-3/STM-1 ports per module

    • Three or six T3 ports per module

    • Three or six E3 ports per module

    • Four or eight T1 ports per module

    • Four or eight E1 ports per module

  • IMA (Inverse Multiplexing over ATM)

  • Virtual Switch Interface (VSI) to support an attached Label Switch Controller (LSC) for MPLS

  • Virtual path connections (VPCs) and virtual channel connections (VCCs)

  • 310 Mbps (OC-6) sustained throughput per card

  • Integrated Local Management Interface (ILMI) per ATM Forum UNI 3.1

  • Standards-based dual leaky bucket policing

  • Traffic shaping

  • Per-virtual circuit queuing

  • Large dynamically-assigned buffers (64,000 cells ingress and 64,000 cells egress per module)

  • Per-virtual circuit rate scheduling

  • Standards-based implementation of available bit rate (ABR)

    • Explicit Forward Congestion Indication (EFCI) marking

    • Explicit rate (ER) marking

    • Virtual source/virtual destination (VS/VD)

  • 8000 connections per module

  • Standards-based ATM layer fault management per TA-NWT-1248-OAM (F4 and F5), AIS, and RDI

  • Alarm and fault detection per GR-253-CORE (section 6), TA-NWT-1248, for PHY and ATM layer

  • Statistics collection with support elements of RFC 1695 MIB via platform software

  • Simple Network Management Protocol (SNMP) configuration and access via platform software

  • Redundancy with hot standby switchover

ATM User Services

The UXM-E enables the interconnection of routers, campus switches, and other devices to wide-area switches using ATM UNIs. It provides a standards-based ATM interface on the IGX 8400 series switch to connect to any vendor's equipment. The following VPCs and VCCs are supported on the UXM-E. All these connections may traverse any UXM-E trunk interface.

  • Constant bit rate (CBR)

  • Variable bit rate-Real Time (VBR-RT)

  • Variable bit-rate-Non Real Time (VBR-NRT)

  • Unspecified bit rate (UBR)

  • Available bit rate (ABR)

ATM Trunking Services

The UXM-E provides standards-based ATM interfaces on the IGX 8400 series switch to interconnect Cisco wide-area switches using leased lines or foreign (public/private) ATM networks. These ATM trunks can be used to transport ATM, Frame Relay, voice, or circuit data services between IGX switches as well as interconnection between IGX switches and Cisco BPX® 8600 series switches. Using UXM-Es, IGX switches can be interconnected via leased-line trunks at various rates, including OC-3/STM-1, T3, E3, NxT1, and NxE1 (with 1£N£8).

Inverse Multiplexing over ATM

In order to bridge the large gap between T1 and T3 and between E1 and E3, the UXM-E supports inverse multiplexing over ATM for NxT1 or NxE1 trunking between IGX switches. This capability also provides some resiliency in the network by providing 1:N redundancy in the IMA group. This functionality offers the following capabilities:

  • Multiple IMA groups per UXM-E card; up to eight groups per eight-port card. All links in a group must use the same clock.

  • Each IMA group on a UXM-E may contain as few as one T1 or E1 link.

  • Differential delays of up to 250 ms for T1 and 209 ms for E1 across the constituent T1s or E1s of an IMA group

  • The administrator may specify the number of "retained links" for each IMA group. This represents the number of unfailed links necessary for the IMA group to remain in service.

  • If a link within an IMA trunk fails, the IMA group dynamically re-calculates the available trunk bandwidth. If the remaining bandwidth is insufficient to support all the connections on the trunk, all the connections are rerouted and fewer connections are allowed to used the trunk.

Virtual Trunking

With the UXM-E, IGX switches can easily be interconnected via foreign (public or private) ATM networks using virtual path trunking over VPCs. The UXM-E supports multiple virtual trunks per physical interface, up to a maximum of 15 virtual trunks per module.
When using a foreign ATM network as a virtual trunk, all the "networking" features are preserved, as are the traffic management capabilities. This allows enterprise customers to utilize public ATM services, where available, and benefit from the lower cost of ATM services compared to dedicated leased lines.

Traffic Management

Cisco's commitment to traffic management for ATM is unprecedented in the industry today. UXM-E modules contain the following capabilities that enable efficient traffic management in an IGX 8400 series network:

  • Per-virtual circuit ingress queuing and scheduling

  • Per-virtual circuit egress traffic shaping

  • Large, dynamically-assigned buffers (64,000 cells ingress and 64,000 cells egress per module)

  • Dynamic buffer management with threshold scaling

  • Up to 16 classes of service, including the standard ATM classes (CBR, VBR-RT, VBR-NRT, UBR, and ABR) with the following configurable parameters:

    • Maximum queue depth (MQD)

    • Cell loss priority (CLP) high and low thresholds

    • EFCI threshold

  • Support for Cisco's ForeSight®

This enables the IGX 8400 series to ensure that guaranteed QoS levels are met under any network condition.

Technical Specifications

Hardware

  • 64-bit RISC processor for administrative functions

  • 8 MB of Flash memory

  • 32 MB of DRAM

  • 128,000 cells of buffering dynamically allocated

  • a dedicated ASIC for policing of the traffic streams on a per-connection basis (RCMP)

  • a dedicated ASIC for ABR support on a per-connection basis (SABRE)

  • a dedicated ASIC for queuing of up to 16 classes of service and per-connection queuing (QE)

  • a dedicated ASIC for interworking between ATM and Frame Relay (GATEWAY)

  • a dedicated ASIC for backplane interface (COBRA)

Physical Layer

Description OC-3/STM-1 Single-Mode Fiber (IR) OC-3/STM-1 Single-Mode Fiber (XLR) OC-3/STM-1 Multi-Mode Fiber STM-1 Electrical T3 E3 T1 E1
Line Rate

155.52 Mbps

155.52 Mbps

155.52 Mbps

155.52 Mbps

44.736 Mbps

34.468 Mbps

1.544 Mbps

2.048 Mbps
Connector Type

SC

SC

SC

BNC

SMB (adapter available for BNC)

SMB (adapter available for BNC)

DB-15

DB-15

BNC
Impedance

—

—

—

75 Ohms

75 Ohms

75 Ohms

120 Ohms

120 Ohms (DB-15)

75 Ohms (BNC)
Optical Transmit Signal Level (max/min)

-8 dBm/
-15 dBm

0 dBm/
-3 dBm

-15 dBm/
-22 dBm

—

—

—

—

—
Optical Receive Signal Level (max/min)

-8 dBm/
-28 dBm

-3 dBm/
-34 dBm

-10 dBm/
-31 dBm

—

—

—

—

—
Laser Wavelength

1310 nm

1550 nm

1310 nm

—

—

—

—

—
Cable Length

approx. 15 km

100 km (see Note)

2 km

—

0-450 ft

—

0-655 ft

—
Line Coding

NRZ

NRZ

NRZ

CMI

B3ZS

HDB3

B8ZS

HDB3
Idle Code

Configurable

Configurable

Configurable

Configurable

Configurable

Configurable

Configurable

Configurable
ATM Mapping

PLCP/HEC

PLCP/HEC

PLCP/HEC

HEC

PLCP/HEC

HEC

HEC

HEC
Physical Framing

STS3C, STM1

STS3C, STM1

STS3C, STM1

STS3C, STM1

ANSI T1.107 C-bit parity

G.832

ESF

Multiframe, clear channel
Payload Scramble

On/Off

On/Off

On/Off

On/Off

On/Off

On/Off

On/Off

On/Off
Standards

Bellcore GR-253-CORE ANSI T1.105 ITU-T G.707, G.957, G.958

Bellcore GR-253-CORE ANSI T1.105 ITU-T G.707, G.957, G.958

Bellcore GR-253-CORE ANSI T1.105 ITU-T G.707, G.957, G.958

G.703, G.707, G.783, G.813 ANSI T1.102

ANSI T1.102, T1.107, T1.404, ITU-T G.824

ITU-T G.804, G.823, G.832, G.703

ANSI T1.102, T1.231, T1.403 ITU-T G.824

ITU-T G.703, G.704, G.706, G.732, G.735-9, G.775, G.823, G.826, I.431
HCS Masking

Yes/No

Yes/No

Yes/No

Yes/No

Yes/No

Yes/No

Yes/No

Yes/No
ATM Cell Rate Per Port

353,207 cps

353,207 cps

353,207 cps

353,207 cps

96,000 cps

80,000 cps

3,622 cps

4,830 cps
Note: Minimum length before attenuator is required to prevent saturation: 15 km. Recommended attenuator: Neptec MA30-SC-U/SC-U-C3-02.
ATM Layer
ATM Layer Management Protocol

ILMI or None
Standards

ATM Forum UNI 3.1, TM 4.0

ITU-T I.150, I.361, I.371, I.432, I.610
Valid VPI Range

NNI: 1-4095

UNI: 1-255
Valid VCI Range for User Traffic

VCC: 0-65,535

VPC: 32-65,535
Frame to ATM Interworking

Network Interworking (FRF.5)

Service Interworking (FRF.8)
Connection Types Supported

CBR: Constant Bit Rate

RT-VBR: Real-time Variable Bit Rate

NRT-VBR: Non-Real-time Variable Bit Rate

UBR: Unspecified Bit Rate

ABRSTD: Available Bit Rate using TM4.0 Traffic Management

ABRFST: Available Bit Rate using ForeSight Traffic Management

ATFR: ATM-to-Frame Relay Network Interworking (FRF.5)

ATFST: ATM-to-Frame Relay Network Interworking (FRF.5) with ForeSight Traffic Management

ATFT: ATM-to-Frame Relay Transparent Service Interworking (FRF.8)

ATFTFST: ATM-to-Frame Relay Transparent Service Interworking (FRF.8) with ForeSight Traffic Management

ATFX: ATM-to-Frame Relay Translational Service Interworking (FRF.8)

ATFXFST: ATM-to-Frame Relay Translational Service Interworking (FRF.8) with ForeSight Traffic Management
Connection Parameters Supported
Name Units Description CBR RT-VBR NRT-VBR UBR ABRSTD ABRFST ATFR ATFST ATFT ATFTFST ATFX ATFXFST
PCR(0+1)

Cells/second

Peak Cell Rate for cells with CLP=0 or CLP=1

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
% Util

Percentage

Percent Utilization

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
MCR

Cells/second

Minimum Cell Rate

Y

Y

Y

Y

Y

Y
CDVT(0+1)

Microseconds

Cell Delay Variation Tolerance for cells with CLP=0 or CLP=1

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
AAL5 FBTC

Enable/Disable

AAL5 Frame-Based Traffic Control

Y

Y

Y

Y

Y

VSVD

Enable/Disable

Virtual Source/Virtual Destination

Y

FCES

Enable/Disable

Flow Control of External Segments

Y

Y

Y

Y

Y
SCR

Cells/sec.

Sustained Cell Rate

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
MBS

Cells

Maximum Burst Size

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
Policing

1 - 5

Type of ingress cell policing to be applied.
See the Table below for a description of each policing mode.

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
VC Qdepth

Cells

Depth of the ingress queue (VC_Q) dedicated to the VC

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y

Y
CLP Hi

Percentage of VC Qdepth

Upper VC_Q threshold above which arriving cells with CLP=1 are discarded.

Y

Y

Y

Y

Y

Y

Y

Y
CLP Lo

Percentage of VC Qdepth

Lower VC_Q threshold below which arriving cells with CLP=1 are accepted again after CLP Hi threshold was previously reached.

Y

Y

Y

CLP Lo/EPD

Percentage of VC Qdepth

VC_Q threshold used as the "CLP Lo" parameter (as above) and as the Early Packet Discard threshold

Y

Y

Y

Y

Y
CLP Setting

Enable/Disable

Tag (i.e., set CLP=1) all PCR compliant cells

Y

EFCI

Percentage of VC Qdepth

Threshold of VC Qdepth above which new cells have their Explicit Forward Congestion Indication bit set

Y

Y

Y

Y

Y

Y

Y

Y
ICR

Cells/second

Initial Cell Rate

Y

Y

Y

Y

Y
ADTF

Milliseconds

Allowed Cell Rate Decrease Time Factor

Y

Y

Y

Y

Y
Trm

Milliseconds

Minimum time between RM cells generated

Y

Y

Y

Y

Y
RIF

ABR: power of 2
ForeSight: Percentage

Rate Increase Factor

Y

Y

Y

Y

Y
RDF

ABR: power of 2
ForeSight: Percentage

Rate Decrease Factor

Y

Y

Y

Y

Y
IBS

Cells

Initial Burst Size

Y

Y

Y

Y

Y

Y
Nrm

Cells

Maximum number of data cells between RM cells generated

Y

Trunk cell routing restrict

Yes/No

Yes: Force this connection to use only ATM trunks in the network.

No: Allow this connection to use FastPacket trunks in the network.

Y

Y

Y

Y

Y

Policing Modes
Type ATM Forum TM 4.0 Designation PCR Flow Policing in First Leaky Bucket SCR Flow Policing in Second Leaky Bucket
Cells Policed CLP Tagging of Non-Compliant Cells Cells Policed CLP Tagging of Non-Compliant Cells
1 VBR.1

All (CLP=0 and CLP=1)

No

All (CLP=0 and CLP=1)

No
2 VBR.2

All (CLP=0 and CLP=1)

No

CLP=0 only

No
3 VBR.3

All (CLP=0 and CLP=1)

No

CLP=0 only

Yes
4 CBR.1

All (CLP=0 and CLP=1)

No

None

N/A
5

None

N/A

None

N/A
Physical/Electrical Specifications
Dimensions

Front card: 15.25 x 16.25 inches
Back card: 6.5 x 16.25 inches
Weight

Front card: 8 lb (3.6 kg)
Back card: 4 lb (1.8 kg)
Input Voltage

-48 VDC
Power Consumption

54W
Electrical and Safety Standards

FCC Part 15

Bellcore GR1089-CORE

IEC 801-2, 801-3, 801-4, 801-5, 825-1 (Class 1)

EN 55022,

UL 1950, 60950