
303560-A Rev 00
2-669
ft1_config
Displays configuration details of the FT1/T1 DSU/CSU adapter module. Use this
command to verify the information configured for FT1 operations. The display includes
the following information:
Line Type Frame format used on the T1 line, as follows:
• SF -
Superframe
•
ESF -
Extended superframe
Line Coding Line coding configured for the FT1/T1 DSU/CSU adapter module,
as follows:
• AMI - Alternative Mark Inversion transmits a binary 0 as 0 volts
and a binary 1 as either a positive or negative pulse with the
opposite polarity of the previous pulse. With AMI coding, the
adapter module remains in frame synchronization for 45
consecutive zeros.
•
B8ZS -
Bipolar 8 Zero Substitution
replaces a block of eight
consecutive binary zeros with an 8-bit B8ZS code containing
bipolar violations in the fourth and seventh bit positions of the
substituted code in a transmitted message. When a message is
received, this action is reversed: the B8ZS code is replaced with
eight consecutive binary zeros.
Loop Config Indicates the loopback setting as follows:
• Line Loopback
- Loops received data back onto the T1
transmission path at the point where the T1 interface enters the
FT1/T1 DSU/CSU adapter module.
• Payload Loopback
- Detects and encodes an ANSI Bit-Oriented
Payload Loopback message or an AT&T Payload Loopback
message across the T1 Facility Data Link (FDL). Upon detection
of a Payload Loopback message, the FT1/T1 DSU/CSU adapter
module transmits the received information in the outgoing
direction.
• No Loop -
No loopback is configured on the FT1/T1 DSU/CSU
adapter module.
FDL Configuration Defines the type of Facility Data Link (FDL) configured, as
follows:
•
ANSI403
- ANSI Publication T1.403
•
ATT54016
- AT&T Publication 54016
Primary Tx Clock Defines the type of primary T1 transmit timing source used, as
follows:
•
Loop
- Timing from the T1 port.
•
Local
- Internal timing from the FT1/T1 adapter module.
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