Cabletron Systems T1 manual Wpim Timeslot Configuration Table

The WAN Physical Configuration Screen

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.

3.1.3The 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 3-5