Motorola and V.32bis, V.34-SDC, 326X V.34 manual Table B-5 Motorola DB-25 Low Capacitance Cables for

For example, assume you require a 30-foot cable. You intend to operate your modem at 64.0 kbps. After looking at Table B-4, you determine that the maximum capacitance for the cable is 900 pF. According to the formula above, divide 900 pF by 30 feet. The result is 30 pF per foot:

900 pF

= 30 pF/ft

30 ft

Motorola recommends you use Motorola cables to attach your 326X modem(s) to DTE(s). Use Table B-5to select cable(s) for your application.

To use non-Motorola cables, Table B-6provides examples of vendor cable wire length versus DTE rates for 326X stand-alone units. NOTE: The part numbers specified in Table B-6are not for complete cables, but for the wires that are available with the correct capacitance to support the higher rates of the 326X Modem.

Table B-5.

Motorola DB-25 Low Capacitance Cables for 326X

	Motorola
	Product	Up to 19.2	Up to 64.0	Up to 96.0	Up to 115.2
Description	Code	kbps (ft)	kpbs (ft)	kbps (ft)	kbps (ft)
Motorola	92153	50	30	10	6
Male 25-Male 25	92152
Straight-through
	92151
	92150
Motorola	92157	50	30	10	6
Male 25-Female 25	92156
Straight-Through	92155
	92154
Motorola	92161	50	30	10	6
Male 25-Female 25	92160
Crossover	92159
	92158

NOTE: Motorola DB-25 Cables have a conductor capacitance of 11 pF/ft and a shield capacitance of 20 pF/ft for a total capacitance of 31 pF/ft. For example, operating at 19.2 kbps, a 50-ft length of cable multiplied by a total capacitance of 31 pF/ft yields a maximum allowable cable capacitance of 1550 pF, which is acceptable in accordance with Table B-4.

Pinouts Interface

Cabling and Interface Pinouts B-9