Hitachi GR2000 manual Metal Coaxial Cable for Secondary G.703

Pin No.	Function (device side)		Function (DSU side)
1	Unused		Transmit (+)	(B)
2	Unused		Transmit (-)	(b)
3	Transmit (+)	(A)	Unused
4	Receive (+)	(B)	Receive (+)	(A)
5	Receive (+)	(b)	Receive (+)	(a)
6	Transmit (-)	(a)	Unused
7	Unused		Unused
8	Unused		Unused

Note: Because of the cable being a twist pair cable, make pairs of (A) with (a), and (B) with (b) in the above pin assignment. For other cables than these, there is no need of worrying about the pairing, either of being connected or unconnected can be accepted.

3.10.2.4Metal (Coaxial) Cable for Secondary (G.703)

For connection to the Secondary (G.703) interface, a send-and-receive pair of metal (coaxial) cables are required per port (DSU). Figure 3-93 shows the cable specifications. Be noted that neither the single cable length nor the total length of the