Patton electronic 2720 user manual S2 Summary Table

3.1.1 Switch S2

The table below shows the default configurations for Switch S2. A description of all S2 options follows this table.

S2 SUMMARY TABLE

Position	Function	Factory Default	Selected Option
S2-1	Data Rate	On
S2-2	Data Rate	On		1.536 Mbps
				(DTE Rate)
S2-3	Data Rate	On
S2-4	Framing & Coding	Off		ESF/B8ZS
S2-5	DS0 Rate	On		64 kbps
S2-6	Clock Mode	Off		Network
S2-7	Clock Mode	Off		Network
S2-8	Reserved	Off		Reserved

Switches S2-1, S2-2, and S2-3

Use Switches S2-1, S2-2 and S2-3 to set the DTE data rate. Each setting represents an nx56/nx64 setting. Individual channel set- tings can be configured through the software control port.

S2-1	S2-2	S2-3	Speed
Off	Off	Off	Clear Channel (Unframed)
On	Off	Off	112kbps/128kbps
Off	On	Off	224kbps/256kbps
On	On	Off	336kbps/384kbps
Off	Off	On	448kbps/512kbps
On	Off	On	672kbps/768kbps
Off	On	On	896kbps/1024kbps
On	On	On	1344kbps/1536kbps

Switch S2-4: Line Framing and Coding

Use Switch S2-4 to control the Network Line Framing and Coding Options. Set these options to be the same as the Line Framing and Coding Options given to you by your Service Provider. If you are using two Model 2720s together as short range modems, set both units iden- tically.

S2-4 Line Framing & Coding

Off ESF/B8ZS

On D4/AMI

Line Framing Options:

D4/Superframe: The D4 framing format, as specified in AT&T TR62411 is the standard in which twelve frames make up a superframe. All signaling and synchronization are done in- band.

Extended Superframe (ESF): Extended Superframe, as speci- fied in AT&T TR 54016, consists of twenty-four (24) T1 frames. The framing bits are now used for framing, CRC and the Facility Data Link (FDL). The FDL allows maintenance messages and information to be passed between the 2720 and the Central Office.

Line Coding Options:

Alternate Mark Inversion (AMI): This mode does not inherently account for ones density. To meet this requirement, each time slot can be reduced to 56 kbps and the Least Significant Bit (LSB) of each time slot set to one.

Bipolar 8 Zero Substitution (B8ZS): This mode assures proper bit density in the data stream. In this mode any data pattern can be transmitted without causing ones density errors. This mode allows for 64 kbps clear channel timeslots.

Switch S2-5: DS0 Channel Rate

Use Switch S2-5 to set the DS0 rate.

SW2-5	Setting
Off	56 kbps
On	64 kbps

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