Cisco Systems MGX 8230 manual Structured Data Transfer, Unstructured Data Transfer

Chapter 6 Card and Service Configuration

Eight-Port Circuit Emulation Service Modules

The 8-port CESM lets you configure individual physical ports for structured or unstructured data transfer. The card sets consist of an AX-CESM-8T1 or AX-CESM-8E1 front card and one of the following back cards:

•RJ48-8T1

•R-RJ48-8T1 for supporting 1:N redundancy through the optional MGX-SRM-3T3/C

•RJ48-8E1

•R-RJ48-8E1 for supporting 1:N redundancy through the optional MGX-SRM-3T3/C

•SMB-8E1

Structured Data Transfer

If you configure an individual port for structured data transfer, the 8-port CESM supports:

•Synchronous timing.

•Superframe or Extended Superframe for T1.

•N x 64 Kbps, fractional DS1/E1 service (contiguous time slots only). You can map an N x 64 Kbps channel to any VC.

•CAS robbed bit for T1 (ABCD for ESF and SF frames) and CAS for E1 (channel 16).

•CCS channel as a transparent data channel.

•A choice of partial-fill payload sizes.

•Idle detection and suppression for 64Kbps CAS connections.

•Loopback diagnostics on a line or a connection (addlnloop, tstcon, and tstdelay commands).

•Bit error rate test (BERT) functionality with loopback pattern generation and verification on individual lines or logical port. For a description of the BERT functions, see the section titled “Bit Error Rate Testing Through an MGX-SRM-3T3.”

Unstructured Data Transfer

If you configure an individual port for unstructured data transfer, the 8-port CESM supports:

•Synchronous or asynchronous timing at T1 (1.544 Mbps) or E1 (2.048 Mbps) rates. For asynchronous timing, you can select its basis as either SRTS and adaptive clock recovery.

•The special port type framingOnVcDisconnect. This port type prevents a remote-end CPE from going to LOF by placing a line in remote loopback mode when the CESM determines that a connection deletion or suspension occurred at the network-side ATM interface.

•Ability to detect and display a yellow alarm for the ESF framing on a T1 line.

•Loopback diagnostics on a line or a connection (addlnloop, tstcon, and tstdelay commands).

•Bit error rate test (BERT) functionality with loopback pattern generation and verification on individual lines. For a description of BERT functions, see the section “Bit Error Rate Testing Through an MGX-SRM-3T3.”

	Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001		6-43