Lucent Technologies PortMaster - Manual (Page 178)

Using Channelized T1
11-10 PortMaster Configuration Guide
• TEST—under test
• DOWN—unavailable
To display the status for all modems, use the following command:
Command> show modems
Using Channelized T1
The PortMaster 3 has an integrated channel service unit/digital service unit (CSU/DSU).
However, the other end of a T1/E1 connection might require an external clock signal
provided by the telephone company, or a CSU/DSU.
Why Use Channelized T1?
Channelized T1 service provides 24 channels of 56Kbps capacity each. An ISDN PRI line
provides 23 channels of 64Kbps capacity each—plus one 64Kbps signaling channel.
However, channelized T1 is available in many service areas that do not yet provide ISDN
PRI. In areas where PRI is available, the cost of channelized T1 may be significantly less
than the cost of PRI.
How to Order DS-1 Service from the Telephone Company
The telephone company will ask you the following two questions when you order
digital service level 1 (DS-1) service:
• What signaling protocol do you use?
You can use either of the following signaling protocols on the PortMaster 3:
– E & M wink start
– Foreign exchange station (FXS)
• If you use E & M wink start, how many Directory Number Identification Service
(DNIS) digits do you need?
ComOS 3.6-and-later releases require one DNIS digit.
Record the line parameters provided by the telephone company.