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Chapter
Circuit Emulation Service Module (8-port)
The 8-port Circuit Emulation Service Module (CESM) is a two-card set consisting of an CESM function
module front card and either a 8-T1 or a 8-E1 line module back card. T1 lines use RJ48 connectors, E1
line module cards use either RJ48 or SMB connector types. The possible line modules are
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Up to 10 CESMs may be installed in a shelf in slots 5 through 14. For T1 line versions, 1:N redundancy
is supported either through redundant line modules or through the SRM-T1E1 board. Likewise, for
T1/E1 versions, BERT and loopbacks are supported using the SRM.
A 1:N redundancy for E1 version is provided through redundant line modules only.
The main function of the CESM cards is to provide a constant bit rate (CBR) service for T1/E1 ports
over ATM network.
The CESM converts DS1/E1 or data streams into CBR AAL1 cells for transport across the ATM
network. The T1/E1 versions support a choice of structured or unstructured data transfer on a
per-physical-interface basis.
The CESM card supports loopback diagnostics features through the addlnloop command.
Note
The addchanloop command is not supported in the 8-port CESM.
Refer to the Cisco MGX 8220 Command Reference for details of these commands.
T1/E1 Structured Data Transfer
The T1/E1 structured data transfer mode supports
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T1/E1 Unstructured Data Transfer
The T1/E1 unstructured data transfer mode supports:
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Release 5.0, Part Number 78-6430-03 Rev. D0, November 2003
AX-RJ48-8T1-LM
AX-R-RJ48-8T1-LM
AX-RJ48-8E1-LM
AX-R-RJ48-8E1-LM
AX-SMB-8E1-LM
AX-R-SMB-8E1-LM
Synchronous timing only.
A nx64 Kbps Fractional DS1/E1 service with contiguous time slots. Any nx64 kbps channel can be
mapped to any VC. Both SF and ESF framing modes are supported.
For AAL1 interworking conversion only, CAS robbed bit for T1 (ABCD for ESF and SF frames)
and CAS for E1 (Channel 16).
CCS channel transparently as data.
Choice of partially filled cells.
Idle Suppression/Detection for 1x64 CAS connections only.
Both synchronous and asynchronous clocking.
Circuit Emulation Service Modules
Cisco MGX 8220 Installation and Configuration
4-29
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Troubleshooting
