Data Sheet

Cisco MGX-CESM-T3/E3 Circuit Emulation Service Modules

The Cisco MGX-CESM-T3/E3 Circuit Emulation Service Modules (CESMs) 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 product lines. This service module offers high-speed circuit services over an ATM backbone for the new world of data networking. Growth for clear-channel T3/E3 circuit services has outpaced all other types and speeds of leased-line offerings.

The new world of networking will require support for circuit services across an IP+ATM packet-switched backbone. The CESM provides this capability using standards-based adaptation of circuit interfaces onto ATM. The MGX-CESM-T3/E3 provides one port of high-speed T3 or E3 unstructured data transfer (UDT) circuit services on a single, seven-inch function module.

The CESM-T3E3 provides direct connectivity to one T3 or E3 line for full-duplex communications at the DS3 rate of 44.736 MHz or at the E3 rate of 34.368 MHz. Each T3 or E3 line consists of a pair of 75-ohm BNC coaxial connectors, one for transmit data and one for receive data, along with three LED indicators for line status.

Ordering Information

MGX-CESM-T3E3(=)	One T3 or E3 Circuit Emulation Service Module
MGX-BNC-2T3(=)	Two T3 75-ohm BNC back cards for CESM T3E3, top port is used
MGX-BNC-2E3(=)	Two E3 75-ohm BNC back cards for CESM T3E3, top port is used

Highlights

CESM cards support circuit emulation services using standards-based adaptation layers over ATM. The CESM-T3E3 uses AAL1 for T3 or E3 unstructured transfer mode operation, per the ATM Forum's Circuit Emulation Specification, Version 2.0.

Programmable egress buffer size and CDV tolerance settings are supported for flexible support of jitter and latency requirements.
Bit count integrity is maintained when AAL1 lost-cell condition is detected.
The CESM card provides ingress/egress data and signaling trunk conditioning per VC as per ATM Forum CES V2.0.
T3/E3 CESM cards can be Y-cabled to provide 1:1 hot standby redundancy of the CESM.
CESM cards are supported by standards-based management tools, including SNMP, TFTP (for configuration/statistics collection), and a command-line interface. The Cisco WAN Manager and CiscoView tools also provide full graphical user interface support for connection and equipment management.

One DSX-3 (44.736 Mbps +/-40 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
T3 bit error rate tester (BERT) and extended loop-up, loop-down pattern generation and verification
1:1 redundancy with Y-cabling for T3 CESM cards of the same type
LOS alarm detection/generation support
Transmitter loop-timed to receiver or synchronized to shelf

E3 Interfaces

One G.703 (34.368 Mbps +/-20 ppm) interface with dual female 75-ohm BNC coaxial connectors per port (separate RX and TX)
HDB3 line coding
Pulse shape conforming to ITU G.703
E3 BERT and extended loop-up, loop-down pattern generation and verification
1:1 redundancy with Y-cabling for E3 CESM cards of the same type
LOS alarm detection/generation support
Transmitter loop-timed to receiver or synchronized to shelf