
Customizing WAN Interfaces
115391-A Rev. A 4-17
Enabling or Disabling a T1 Line
The BayStream software enables T1 line services when you add the interface. You
can enable or disable this interface without moving the physical cabling.
Setting the T1 Frame Type
T1 uses two types of frame formats:
•D4
• Extended superframe (ESF)
The frame format of the interface should match the frame format that the
associated T1 equipment requires. By default, the T1 interface uses ESF framing
format. For detailed information about D4 and ESF frame formats, see the “T1
Overview” section in Chapter 2.
You can set the Frame Type for this interface.
Enabling or Disabling Bipolar with 8-Zero Substitution
T1 uses bipolar format for signals. In bipolar format, alternating positive and
negative pulses on the digital line signify the number one, and the absence of a
pulse signifies zero.
A long string of zeros on a T1 line would cause the line to lose synchronization
due to lack of pulses. Bay Networks offers Bipolar with 8-Zero Substitution
(B8ZS) for T1 synchronization.
Refer to the “T1 Overview” section in Chapter 2 for detailed information.
You can enable or disable B8ZS support on this interface, depending on the ability
of the associated T1 equipment to support B8ZS.
Site Manager: Enable parameter: page A-71
Site Manager: Frame Type parameter: page A-71
Site Manager: B8ZS Support parameter: page A-71
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