Juniper Networks ERX-705, ERX-1410, ERX-1440 Socket on I/O module DB15 X.21 or DB34 At remote end

Connection Information ERX Edge Routers

B-21

Table B-3Connection information for module assemblies (continued)

Assembly	Line
Name and	Module	I/O Module	No. of
Capability	Label	Label	Ports	Connector Type	Cabling Specifications
X.21/V.35	X.21/V.35	X.21/V.35	16	200-pin proprietary	See Table B-4.
		I/O		socket on I/O module
				DB15 X.21 or DB34
				V.35 at remote end

a.The GE SFP I/O module uses a range of simple form factor pluggable transceivers (SFPs) to support different modes and cable lengths.

b.Assembly is superseded by a newer assembly; however, assembly is supported by current software.

Cable Lengths for X.21/V.35 Cables

Serial signals can travel a limited distance without significant degradation. Slower serial signals can travel farther without degradation than faster serial signals. Table B-4shows the maximum cable lengths you can use to prevent signal degradation at various transmission speeds.

Table B-4Maximum cable lengths for X.21/V.35 connections

Transmission Speed (Hz)	Cable Length (Feet)	Cable Length (m)
2400	4,100	1,250
4800	2,050	625
9600	1,025	312
19200	513	156
38400	256	78
56000	102	31
2048000	25	8