Cisco Systems MGX 8230 Structured Data Transfer, Unstructured Data Transfer

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Cisco MGX 8230 Edge Concentrator Installation and Configuration
Release 1.1.31, Part Number 78-11215-03 Rev. B0, May 2001
Chapter6 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 -CE SM-8T1 or AX-CESM-8E1 front car d an d 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 t o 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-fi ll payload sizes.
•Idle detection and su p pression for 64Kbps CA S c onnections.
•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 sel ect i ts b asi s as eit he r S RTS and ad ap tive c lock r ecove ry.
•The special port type framingOnV cDisconnect. This port type prevents a remote-end CPE from
going to LOF by placing a line in remote loop ba ck mode when the CESM determines that a
connection deletion or suspen si on o ccu r re d at th e n et wo r k-s id e 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.”