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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
Chapter 6 Card and Service Configuration
Service Resource Module
• dsplink
• dellink
• addred
• dspred
• delred
Bulk Distribution for T1 Service
The MGX-SRM-3T3/C supports a demultiplexing function called bulk distribution. With bulk
distribution, the MGX-SRM-3T3/C converts traffic from its T3 lines to T1 channels and sends the data
streams across the distribution bus to the appropriate service modules. The benefit of this feature is that
the number of T1 cables and back cards is greatly reduced. Applicable service modules are the
MGX-AUSM/B-8T1, AX-FRSM-8T1, and AX-CESM-8T1.
At its MGX-BNC-3T3-M back card, the MGX-SRM-3T3/C connects to an external multiplexer. The
multiplexer connects to the T1 lines from user-equipment and places the data streams on T3 lines to the
MGX-SRM-3T3/C. Each T3 line can contain 28 T1 channels. An individual MGX-SRM-3T3/C can
support 8 card slots, so the maximum number of T1 channels it can process is 64.
Linking the MGX-SRM-3T3/C to a destination card causes the shelf to take CPE traffic through the
MGX-SRM-3T3/C rather than the T1 card’s line module. Linkage is a card-level condition. If you link
just one T1 channel on a service module to the MGX-SRM-3T3/C, the back card on the service module
becomes inoperative, so you must link all other T1 ports on that service module to the MGX-SRM-3T3/C
if you want them to operate. Linking T1 ports into a group does not form an N X T1 channel. Each T1
channel remains a distinct T1 channel. Furthermore, a group belongs to one slot, so it cannot include T1
channels belonging to another card.
For a description of how the MGX-SRM-3T3/C supports redundancy for linked channels, see the section
“Redundancy Support by the MGX-SRM-3T3/C” in this chapter.
Before configuring bulk distribution on an SRM, perform the following tasks:
1. Activate the lines (addln on the CLI).
2. Optionally configure the lines (cnfln on the CLI).
3. Display the state of the lines (dspln and dsplns on the CLI).
To link T1 ports on a service module to a T3 line on an MGX-SRM-3T3/C:
• Execute addlink on the active PXM1. Related commands are dsplink and dellink.
addlink <T3 line number> <T1 slot> <NumberOfT1s> <TargetSlotLineNum>
• T3LineNum Line number in the format slot.line.
Slot = 7 or 14
Line range = 1–3
• T1Slot T1 slot number, in the range 1–28.
• NumberOfT1s Number of T1s, in the range 1–8.