C H A P T E R
7-1
Optical Services Modules Installation and Configuration Note, 12.2SR
OL-9465-03
7
Configuring the Channelized 12-port CT3/T1
Optical Services Modules
This chapter describes how to configure the 12-port channelized/unchannelized DS3 Optical Services
Modules (OSM-12CT3/T1).
The chapter consists of these sections:
•
Understanding the Channelized/Unchannelized CT3/T1 Modules, page 7-1
•
Supported Features, page 7-2
•
Configuring the Interfaces, page 7-6
Understanding the Channelized/Unchannelized CT3/T1 Modules
The OSM-12CT3/T1 module provides 12DS3 interface connections using mini-SMB connectors.
Each DS3 port can be independently configured all the way from a clear channel DS3 down to and
including DS1, E1,and DS0 connections on the same port, with a maximum of 128 channels per DS3
port.
Each OSM-12CT3/T1 can support any combination of DS3/DS1/E1/T1s up to 1023 channels. For
example, each port can support the following:
•
1 DS3 at 44.7 Mbps
•
21 E1s at 2.048Mbps
•
28 DS1s at 1.5 Mbps
•
128 DS0s at 64 Kbps
An unchannelized DS3 connection provides a single serial interface data channel that may be configured
to use all of the DS3 bandwidth or a fractional portion of it. This mode is compatible with several
vendors of fractional (subrate) DS3 data service units (DSUs).
A cost, depending on the bandwidth, is associated with a serial interface. The total cost possible for 12 DS3
ports is 4096. That is, the sum of the costs of all the serial interfaces configured on 12 DS3 ports must be no
more than 4096. The
show controller t3
command displays the VC cost, which indicates the available cost
of 12 DS3 ports.
Table 7-1
shows the cost associated with each link type.
