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Cisco MGX 8800 Series Switches

Cisco MGX 2 x T3/E3 FRSMs

 

Data Sheet

Cisco MGX 2 x T3/E3 Frame Service Modules


The Cisco FRSM-2T3E3 and FRSM-2CT3 Frame Service Modules (FRSMs) are designed for use with the MGX 8230 and MGX 8250 multiservice gateways, the MGX 8800 series wide-area edge switch and the BPX® 8680 universal service node. The FRSM-2T3E3 and FRSM-2CT3 frame service modules offer high-speed T3/E3 and high-density n x DS0/DS1 frame service interfaces for the new world of data networking.

Demand for high-density aggregation of branch traffic for global enterprises, high-capacity corporate backbones, high-speed access to the global Internet, and service provider internetworking has led to growth in Frame Relay service offerings, and the demand for higher-capacity frame interfaces.

The FRSM-2T3E3 provides two ports of high-speed T3 or E3 frame services on a single, seven-inch function module, while the FRSM-2CT3 provides two channelized T3 interfaces on a single, seven-inch function module for high-density n x DS0 and DS1 frame services.

The FRSM-2T3E3 provides direct connectivity to two full-duplex T3 or E3 lines. In addition to clear channel support, to support the widest range of operational environments, the FRSM-2T3E3 supports proprietary subrate and scrambling features of the T3/E3 DSU vendors Digital Link and ADC Kentrox. Subrate support in the FRSM-2T3E3 maximizes the application of these products in service provider environments for tiered DS3 services. Using the FRSM-2T3E3, up to 48 T3 or E3 ports can be operated simultaneously on the MGX 8800 wide-area edge switch platform, and up to 768 T3 or E3 ports can be operated simultaneously on the BPX 8680 universal service node.

The FRSM-2CT3 provides direct connectivity to two full-duplex T3 lines. Each T3 line provides channelized operation to support n x DS0 and DS1 service ports. Using the FRSM-2CT3, up to 1344 DS1 ports or channelized DS1s can be operated simultaneously on the MGX 8800 wide-area edge switch platform.

Ordering Information

MGX-FRSM-2T3E3(=)

Two clear-channel/subrate T3 or E3 frame service modules

MGX-FRSM-2CT3(=)

Two channelized T3 frame service modules, providing n x DS0 and DS1 ports

MGX-BNC-2T3(=)

Two T3 75-ohm BNC back cards for FRSM-2T3E3 or FRSM-2CT3

MGX-BNC-2E3(=)

Two E3 75-ohm BNC back cards for FRSM-2T3E3

AX-FS-HS (=)

Optional SW license for support of ForeSight and QoS traffic management




Highlights

FRSM cards support multiple HDLC-derivative frame service interfaces, which can be configured on a per-port basis. These service interfaces include the Frame Relay UNI, Frame Relay NNI, ATM FUNI, and frame forwarding— HDLC transparent, providing "channel extension" support for legacy HDLC-based protocols such as Point-to-Point Protocol (PPP).

Traffic is mapped between these service interfaces and the ATM backplane using standards-compliant adaptation. Consistent with Cisco's intelligent quality-of-service (QoS) management features, T3/E3 FRSM cards support per-VC queuing on ingress and multiple class-of-service (CoS) queues on egress.

T3/E3 FRSM cards can be Y-cabled to provide 1:1 hot-standby redundancy of the FRSM.

Frame Relay-to-ATM network interworking and Frame Relay-to-ATM service interworking are both supported on a per-PVC basis.

FRSM cards are supported by standards-based management tools, including SNMP, TFTP (for configuration/statistics collection), and a command-line interface. Cisco's WAN Manager and CiscoView tools also provide full graphical user interface support for connection and equipment management.

With these feature options, customers can independently use either frame- or cell-based interfaces at each site, with independent selection of encapsulation techniques, such as IETF RFC 1490 or 1483, and ensure that the sites communicate.

Features

Physical Layer

T3 Interfaces

  • Two DSX-3 (44.736 Mbps +/-20 ppm) interfaces with dual female 75-ohm BNC coaxial connectors per port (separate RX and TX)

  • B3ZS line coding

  • Pulse shape conforming to ANSI T1.102.1993

  • C-bit parity and M13 line framing formats

  • Scrambling and subrate (FRSM-2T3E3) support of major DSU vendors

  • T3 bit error rate tester (BERT) and extended loopback pattern generation/verification

  • 1:1 redundancy with Y-cabling for T3 FRSM cards of the same type

  • LOS, OOF, AIS, RAI, FEBE alarm detection/generation support

E3 Interfaces

  • Two G.703 (34.368 Mbps +/-20 ppm) interfaces with dual female 75-ohm BNC coaxial connectors per port (separate RX and TX)

  • HDB3 line coding

  • Pulse shape conforming to ITU G.703

  • ITU G.751 line framing format

  • Scrambling and subrate (FRSM-2T3E3) support of major DSU vendors

  • E3 BERT and extended loopback pattern generation/verification

  • 1:1 redundancy with Y-cabling for T3 FRSM cards of the same type

  • LOS, OOF, AIS, RAI, FEBE alarm detection/generation support

Data-Link Layer

All Port Types

  • 7E flags used to delineate frames (with bit stuffing to prevent false flags) and for interframe gaps

  • One flag between frames is considered valid upon receipt

  • Supports configuration of one- or two-flag minimum interframe gap for transmission

  • Valid frame sizes are 5 to 4510 octets

  • Supports up to 2000 (FRSM-2T3E3) or 4000 (FRSM-2CT3) virtual connections per card

  • Each logical port on an FRSM independently configurable to run Frame Relay UNI, Frame Relay NNI, ATM FUNI, or frame forwarding

Frame Relay

  • Each logical port is independently configurable as Frame Relay UNI or Frame Relay NNI

  • Meets ANSI T1.618, using two-octet headers

  • Interpreted CCITT-16 CRC at end of the frame (frame discard if in error)

  • Supports ITU-T Q.933 Annex A, ANSI T1.617 Annex D, and LMI local management for semipermanent virtual circuits (both UNI and NNI portions); enhanced LMI provides autoconfiguration of traffic-management parameters for attached Cisco routers

  • Frame Relay-to-ATM network interworking (FRF.5) and Frame Relay-to-ATM service interworking (FRF.8), both transparent and translation modes, configured on a per-permanent virtual circuit (PVC) basis

  • Ability to extend ForeSight® license technology between two Cisco networks across FR-UNI or FR-NNI using ANSI

  • T1.618 consolidated link-layer messages (CLLM)

  • Standards-based CIR policing and DE tagging/discarding

  • Support for high-priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS

ATM FUNI

  • ATM Forum FUNI mode 1A supported

  • Interpreted CCITT-16 CRC at end of the frame (frame discard if in error)

  • AAL5 mapping of user payload to ATM

  • Supports 16 VPI values (15 plus the zero VPI); supports virtual path connections (VPCs) for all nonzero VPI values (up to 15 VPCs)

  • Supports 64 VCI values

  • Supports OAM frame/cell flows

  • Standards-based usage parameter control

  • Support for high priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS

Frame Forwarding

  • No assumptions made on the frame header format

  • Interpreted CCITT-16 CRC at end of the frame (with frame dropping on an error)

  • If a connection is set up, all frames are routed to/from that connection; otherwise the frame is discarded

  • No translation/mapping attempted between frame header bits and ATM layer EFCI and DE bits

  • A single set of Frame Relay traffic access parameters (for example, CIR) is configured for the logical port in frame-forwarding mode; all arriving frames are treated as if they arrived without a set DE bit; if the frame is determined to exceed the committed rate (exceeding CIR), the CLP of all cells associated with that frame is set to indicate low priority; if the frame exceeds the total rate allowed for committed and uncommitted traffic, the frame is discarded

  • Support for high priority, rt-VBR, nrt-VBR, VBR, and ABR-ForeSight QoS

General Card Information

Indicators

  • Per card: Active (green), standby (yellow), fail (red)

  • Per line: Active and OK (green), active and local alarm (red), active and remote alarm (yellow)

Maintenance/Serviceability Features

  • Internal problem isolation loopbacks

  • Hot-pluggable

Reliability

  • > 100,000 hours MTBF

Card Size

  • Front cards: 7.25 x 15.83 in.

  • Back cards: 7.0 x 4.125 in.

Power

  • FRSM-2CT3= -48 VDC, 49.20W

  • FRSM-2T3/E3= -48VDC, 45.25W