Data Sheet

Cisco MGX -FRSM-T1/E1 Frame Service Modules

Cisco's T1 and E1 frame service modules (FRSMs), for use with the MGX^™ 8220 Edge Concentrator, the MGX 8230 and MGX 8250 Multiservice gateways, and the MGX 8800 wide-area edge switch, offer high-density native T1/E1 frame service interfaces for the new world of data networking. The T1/E1 FRSMs offer eight ports of channelized T1/E1 or fractional/clear T1/E1 frame services on a single, seven-inch function module.

The FRSM-8T1 and FRSM-8T1-C each provide eight T1 interfaces for full-duplex communications at up to 1.544 Mbps.

Each T1 line consists of an RJ-48, along with three LED indicators for line status. The FRSM-8T1 supports fractional and unchannelized T1 port selection on a per-T1 basis. The FRSM-8T1-C allows full DS0 and n x DS0 channelization of the T1s, for a maximum of 192 ports per FRSM-8T1-C. Using the FRSM-8T1-C, up to 192 fully channelized T1 lines can be operated simultaneously on the MGX platform.

The FRSM-8E1 and FRSM-8E1-C each provide eight E1 interfaces for full-duplex communications at up to 2.044 Mbps.

Each E1 line consists of an RJ-48 and SMB mini-connector, along with three LED indicators for line status. The FRSM-8E1 supports fractional and unchannelized E1 port selection on a per-E1 basis. The FRSM-8E1-C allows full DS0 and n x DS0 channelization of the E1s, for a maximum of 248 ports per FRSM-8E1-C. Using the FRSM-8E1-C, up to 192 fully channelized E1 lines can be operated simultaneously on the MGX platform.

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).

Ordering Information

AX-FRSM-8E1(=)	Frame service module, supporting eight E1 lines
AX-FRSM-8E1-C(=)	Frame service module, supporting eight channelized E1 lines
AX-FRSM-8T1(=)	Frame service module, supporting eight T1 lines
AX-FRSM-8T1-C(=)	Frame service module, supporting eight channelized T1 lines
AX-SMB-8E1(=)	Eight E1 SMB back card for E1 FRSMs
AX-RJ48-8E (=)	Eight E1 RJ48 back card for E1 FRSMs
AX-RJ48-8T1(=)	Eight T1 RJ48 back card for T1 FRSMs
AX-R-SMB-8E1(=)	Redundancy back card, supporting SMB-8E1 FRSMs
AX-R-RJ48-8E1 (=)	Redundancy back card, supporting RJ48-8E1 FRSMs
AX-R-RJ48-8T1(=)	Redundancy back card, supporting RJ48-8T1 FRSMs
AX-FS-8 (=)	Optional SW license for support of ForeSight closed loop traffic management

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, serial port FRSM cards support per-VC queuing on ingress and multiple class-of-service queues on egress. Together with closed-loop congestion control, this provides flexible, per-VC control for connection-based service-level agreements (SLAs).

A single FRSM card can provide redundancy for all active FRSM cards of the same type (1:n redundancy).

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.

Eight T1 (1.544 Mbps +/-50 bps or 32 ppm) lines
B8ZS or AMI line coding
ANSI T1.408 extended superframe format line framing
Each interface configurable as a single port (FRSM-8T1) or up to 24 ports (FRSM-8T1-C) running at full line rate, at 56 or n x 64 kbps
Bit error rate tester (BERT) and extended loopback pattern generation/verification (with optional SRM)
1:n redundancy within a group of n + 1 FRSM cards on a shelf (with optional SRM)
LOS, OOF, AIS, RAI alarms
Transmitter loop-timed to receiver or synchronized to shelf

E1 Interfaces

Eight E1 (2.048 Mbps +/-50 bps or 32 ppm) lines
HDB3 or AMI line coding
ITU G.704 16-frame multiframe line framing and clear channel E1
Each interface configurable as a single port (FRSM-8E1) or up to 31 ports (FRSM-8E1-C) running at full line rate, at 56 or n x 64 kbps
BERT and extended loopback pattern generation/verification (with optional SRM)
1:n redundancy within a group of n + 1 FRSM cards on a shelf (with optional SRM)
LOS, OOF, AIS, RAI alarms
Transmitter loop-timed to receiver or synchronized to shelf

Data-Link Layer

All Port Types

Each logical port on an FRSM independently configurable to run Frame Relay UNI, Frame Relay NNI, ATM FUNI, or frame forwarding
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 from 5 up to 4510 octets
Supports up to 1000 virtual connections per card

Frame Relay

Each logical port 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
Standards-based CIR policing and DE tagging/discarding
End-to-end ForeSight^® rate-based flow control option to improve trunk utilization and user goodput
Capability to extend ForeSight closed-loop congestion management between two Cisco networks across Frame Relay-UNI or Frame Relay-NNI using ANSI T1.618 consolidated link-layer management (CLLM) messages
Cisco IOS enhancements to Frame Relay-to-ATM service interworking to allow interworking for a wider range of protocols

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
End-to-end ForeSight rate-based flow-control option

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 are set to indicate low priority; if the frame exceeds the total rate allowed for committed and uncommitted traffic, the frame is discarded
Available end-to-end ForeSight rate-based flow-control option