Appendix A Technical specifications 57
Single V.35/X.21 WAN interface card
The single V.35/X.21 WAN interface card has a single DB28S connector that provides the signals needed to interface to V.35 and X.21 equipment. Figure 26 shows the single V.35/X.21 WAN interface card.
Figure 26 Single V.35/X.21 WAN interface card
CS160011A
You need a DSU/CSU (digital service unit/channel service unit) between the WAN connection and the gateway. You can order a V.35 or X.21 cable from Nortel to attach to the connector. This cable enables the WAN adapter to function as DTE (data terminal equipment).
Table 26 provides the V.35 cable pinouts. Table 27 on page 59 provides the X.21 cable pinouts. (The pair suffix A or B refers to an individual wire within a twisted pair.)
Table 26 V.35 cable pinouts
| Pair number |
| ||
end | Signal name | and conductor | end | Notes |
|
|
|
|
|
2 | TXDA | pair 1A | P |
|
|
|
|
|
|
14 | TXDB | pair 1B | S |
|
|
|
|
|
|
3 | RXDA | pair 2A | R |
|
|
|
|
|
|
16 | RXDB | pair 2B | T |
|
|
|
|
|
|
15 | TXCA | pair 3A | Y |
|
|
|
|
|
|
12 | TXCB | pair 3B | AA |
|
|
|
|
|
|
17 | RXCA | pair 4A | V |
|
|
|
|
|
|
9 | RXCB | pair 4B | X |
|
|
|
|
|
|
24 | SCTEA | pair 5A | U |
|
|
|
|
|
|
11 | SCTEB | pair 5B | W |
|
|
|
|
|
|
4 | RTSA | pair 6A | C |
|
|
|
|
|
|
19 | RTSB | pair 6B | no conn | Note 1 |
|
|
|
|
|