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Cisco MGX 8800 Series Switches

Cisco MGX-AX-CESM-8T1/E1

 

Data Sheet

Cisco MGX-AX-CESM-8T1/8E1 Circuit Emulation Service Modules


The Cisco T1/E1 circuit emulation service modules (CESMs) are designed for use with the MGX 8220 edge concentrators, MGX 8230, MGX 8250 and the MGX 8800 series wide-area edge switches. The CESM-8T1 and CESM-8E1 offer eight T1s or E1s for structured and unstructured circuit services over an ATM backbone for the new world of data networking.

The MGX T1/E1 CESM service modules provide eight T1 or E1 circuit interfaces, with full support for structured (channelized) and unstructured (unchannelized) data transfer modes for circuit emulation services over an ATM backbone.

Ordering Information

AX-CESM-8T1(=)

Circuit emulation service module, supporting eight T1s

AX-CESM-8E1(=)

Circuit emulation service module, supporting eight E1s

AX-RJ48-8T1(=)

Eight port T1 back card, RJ48 connector

AX-RJ48-8E1(=)

Eight port E1 back card, RJ48 connector

AX-SMB-8E1(=)

Eight port E1 back card, SMB connector

AX-R-RJ48-8T1(=)

Redundancy back card for 1 for N spare of CESMs using RJ48-8T1 back cards

AX-R-RJ48-8E1(=)

Redundancy back card for 1 for N spare of CESMs using RJ48-8E1 back cards

AX-R-SMB-8E1(=)

Redundancy back card for 1 for N spare of CESMs using SMB-8E1 back cards

AX-SDT-8

SW license for support of structured data transfer mode

Highlights

The CESM provides constant-bit-rate (CBR) services over an ATM network. It allows circuit-based equipment, such as PBXs, to be interconnected over an ATM backbone via CBR connections. The current CESM-8 supports both channelized (n x 64 Kbps) and unchannelized (T1/E1) circuit-based equipment. In ATM Forum terminology, the terms structured data transfer (SDT) and unstructured data transfer (UDT) are used for channelized and unchannelized circuit emulation, respectively.




In addition, flexible clocking mechanisms are provided to meet different application requirements. Synchronous clocking and asynchronous clocking, using either SRTS or Adaptive clock recovery, are both supported.

As an enhancement, dynamic bandwidth allocation is supported via on-hook/off-hook detection to reduce backbone bandwidth consumed when it is not required by the applications. This allows other traffic streams, such as VBR and ABR traffic, to take advantage of the bandwidth normally reserved for the circuit traffic.

Key Features

  • Standards-based AAL1

  • Compliant with ATM Forum CES—V.2.0

  • Choice of structured or unstructured data transfer per physical interface

  • Time slots must be contiguous for n x 64-kbps fractional T1/E1 service

  • Any n x 64-kbps channel can be mapped to any virtual circuit (VC)

  • Choice of partially filled AAL1 cells per VC

  • Supports Super Frame (SF) and Extended Superframe (ESF) framing modes

  • Supports synchronous clocking for both UDT and SDT

  • Supports asynchronous clocking for UDT, with SRTS and adaptive clock recovery methods

  • ON/OFF hook detection and idle suppression using channel-associated signaling (CAS)

  • Supports physical T1/E1 interfaces via back cards or higher speed channelized interfaces using TDM infrastructure on backplane (SRM)

Traffic is mapped between service interfaces and the ATM backplane using standards-compliant adaptation. Consistent with Cisco's intelligent quality-of-service (QoS) management features, CESM cards support per-VC express queuing.

A single T1/E1 CESM card can provide standby redundancy for all active CESM cards of the same type in the shelf (n:1 redundancy), with SRM.

CESM cards are supported by standards-based management tools, including Simple Network Management Protocol (SNMP), Trivial File Transfer Protocol (TFTP) for configuration and statistics collection, and a command-line interface. Cisco WAN Manager also provides full graphical user interface (GUI) support for connection and equipment management.

Specifications

Physical Layer

T1 Cards

  • Eight T1 (1.544 Mbps +/-32 ppm) lines

  • Line interface connector: Balanced, 100-ohm RJ-48C (converter cables to DB-15 are available)

  • Line coding: B8ZS per ANSI T1.408

  • Line framing: Extended SF format per ANSI T1.408

  • Input jitter tolerance per ATT TR 62411

  • Output jitter generation per ATT TR 62411 using normal mode synchronization

  • Bit error rate test or (BERT) and extended loopback pattern generation/verification (with optional SRM)

  • 1:n redundancy within a group of n + 1 CESM cards on a shelf (with optional SRM)

  • LOS, OOF, AIS, RDI alarms

E1 Cards

  • Eight E1 (2.048 Mbps +/-32 ppm) lines

  • Line interface connector: balanced, 100-ohm RJ-48C; unbalanced, 75-ohm SMB (converter cables to DB-15 and BNC are available)

  • Line coding: HDB3

  • Line framing: 16-frame multiframe per G.704

  • Input jitter tolerance per ITU G.823 for 2.048 Mbps

  • Output jitter generation per ITU G.823 for 2.048 Mbps

  • BERT and extended loopback pattern generation/verification (with optional SRM)

  • 1:n redundancy within a group of n + 1 CESM cards on a shelf (with optional SRM)

  • LOS, OOF, AIS, RDI alarms

Counters

T1/E1 Framers

  • FEBE count

  • OOF count

  • LCV count

  • FER count

  • CRC error count

AAL-1 SAR

  • Number of OAM cells received

  • Number of OAM cells dropped FIFO full

  • Number of SN CRCs not correctable

  • Number of cells with SN different from SN+1

  • Number of cells received from UTOPIA interface

  • Number of cells transmitted to UTOPIA interface

ATM Cells

  • Number of cells transmitted to the PXM/BNM

  • Number of cells transmitted with CLP bit set

  • Number of AIS cells transmitted

  • Number of FERF cells transmitted

  • Number of end-to-end loopback cells transmitted

  • Number of segment loopback cells transmitted

  • Number of cells received from the PXM/BNM

  • Number of cells received with CLP bit set

  • Number of AIS cells received

  • Number of FERF cells received

  • Number of end-to-end loopback cells received

  • Number of segment loopback cells received

  • Number of OAM cells discarded because of CRC-10 error

General Card Information

  • Card status indicator LEDs: Active (green), Standby (yellow), Fail (red)

  • Line status indicator LEDs: Active and Okay (green)

  • Active and local alarm (red)

  • Active and remote alarm (yellow)

Maintenance/serviceability features

  • Internal loopbacks

  • Hot pluggable

Reliability

  • > 85,000 hours MTBF

Card size

  • Front cards 7.25 x 16.25 in.

  • Back cards 7.0 x 4.125 in.

  • Power: -48 VDC, 29.10W

Temperature Range

  • 0-50oC (32o-122oF)

Electrical and Safety Compliance

  • FCC Part 15 Class A

  • CISPR Class A (EN55022)

  • NEBS GR-63-CORE, GR-1089-CORE