Hitachi GR2000 Series Installation Manual page 185

shows the cable specifications.
When connecting to a TA or modem on the X.21 interface, an HN-F9355-73H cab
(5m) or its option for 1m to 16m (request for price quotation basis) is applicable. T
latter is required when the line speed is 6 Mbps.
When using the own router as a DCE and connecting to a DTE-attached cable on
X.21 interface, an HN-F9355-77H cable (5m) is applicable. This direct connection
allows the line speed of 768 kbps or less, and the maximum cable length of 16 m
between the DCE and the DTE..
Line speed range (XR bit/S) Cable length limitation
9.6 < X < 1024 (Note 1)
1024 < X < 1536
1536 < X < 6144 (Note 2)
((Note 1) It is 2.4 < x < 1024 in NWVX-8.
(Note 2) It is 1536 < x < 2048 in NWVX-8.
16m or shorter.
10m or shorter.
1m or shorter.
Coordinating cable
HN-F9355-72H (5m)
Cables other than 5m are coordinated
individually.
HN-F9355-72H (5m)
Cables other than 5m are coordinated
individually.
Coordinated individually.