Black Box COMPACT T1 MT850A - Manual (Page 508)

15-10 Compact T1 - Release 6.1
V.35/V.54 Cards
Connector Pinouts
Sub-miniature
DB-26 Signal Winchester
34-pin (female) Paired
Signals
10  Xmit Clock A → Y
]
23  Xmit Clock B → AA
15  Receive Clock A → V
]
17  Receive Clock B → X
22 ← Local Loopback  J
]
25 ← Remote Loopback  BB
9, 13, 18 Open Pins/No Contact L, N, NN
19, 21, 26 Open Pins/No Contact