Hitachi GR2000 - Manual (Page 193)

Pin No. Specifications
1 Unused
2 Unused
3 Transmit (+)
4 Receive (+)
5 Receive (+)
6 Transmit (-)
7 Unused
8 Unused
Note: Because of being a twisted pair cable, make pairs of (A) and (a), and (B) and (b) using the ab
pin assignment. For pins other than these, do not care about the pairing, either unconnected or
connected can be accepted.
INS Net 64
or SD-I64
Flat metal cable (4-wire)
Customer setup length L1 (bus connection with up to 8 modular rosettes)
Carrier (e.g., NTT)
facility Customer facility
DSU