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T1 Tx Clock Source (Toggle)
Displays the T1 Transmit Clock Source. This field toggles between
Loop-Timing (Extracted Line Data) and Local-Timing (Internal Clock).
The default setting is Loop-Timing.
T1 Line Buildout (Selectable)
Displays the line coding for the physical T1 line. Set this to 0 dB unless
the service provider recommends another setting. The default setting for
this field is 0 dB. The following settings are available in this field:
•
0 dB
•
-7.5 dB
•
-15 dB
•
-22.5 dB
•
133-266 Ft
•
267-399 Ft
•
400-533 Ft
•
534-655 Ft
T1 Loopback (Selectable)
Network Loopback is a testing procedure that segments the line and
allows the user to isolate faults. The selections for this field are None,
Line-Loop, and Payload-Loop. In Line-Loop the entire T1 line is looped
back, including the framing bits, CRC, and the facility data link. This
happens before the framer. In Payload-Loop, only the 24 time slots are
looped back, which happens behind the framer, and does not include the
framing bits, CRC, and facility data link. The WPIM-T1/DDS must be in
Loop-Timing mode to use this option. The default setting is None.
3.1.3
The WPIM Timeslot Configuration Table
The WPIM Timeslot Configuration table allows the user to configure the
way in which the Cabletron Systems WAN module uses the T1 line. The
configuration table consists of 24 Timeslots. Each Timeslot must be
assigned an Interface number (for example, 002 for an active Interface
number or 000 if the Timeslot is not used). When an entire T1 line is
leased, all 24 Timeslots (the full T1 bandwidth) can be used. If only a
fraction of the T1 line is leased, the service provider indicates which
Timeslots to use.
WPIM-T1/DDS User's Guide
The WAN Physical Configuration Screen
3-5
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