Specifications

4-3
PA-8T-V.35 Synchronous Serial Port Adapter Installation and Configuration
OL-3563-03
Chapter 4 Attaching the PA-8T-V.35 Interface Cables
Determining the Port Mode
Determining the Port Mode
The compact serial cable connected to each port determines the mode of the ports (the electrical interface
type is always V.35). The default mode of the ports is data communications equipment (DCE), which
allows you to perform a loopback test on any port without having to attach a port adapter cable. For
information related to the loopback command, see the “Using the ping Command to Verify Network
Connectivity” section on page 5-29. Although DCE is the default, there is no default clock rate set on
the interfaces. On the Cisco 7100 series, Cisco 7200 series, Cisco uBR7200 series, Cisco 7301 routers,
or the Cisco 7401ASR router when there is no cable attached to a port, the software actually identifies
the port as cable type: None present rather than either a DTE or a DCE interface. On a Cisco 7304 PCI
Port Adapter Carrier Card, Catalyst RSM/VIP, Catalyst 6000 family FlexWAN module, and VIP, when
there is no cable attached to a port, the software actually identifies the port as Universal (cable
unattached) rather than either a DTE or a DCE interface.
Caution You can attach only an EIA/TIA-V.35 compact serial cable to the PA-8T-V.35 installed in your router.
Attaching a compact serial cable of another interface type to the port adapter could damage your router
or the hardware at the network end of the cable.
Following is an example of the show controllers serial command that shows a Cisco 7100 series router,
a Cisco 7200 series router, a Cisco uBR7200 series, Cisco 7301 router, or a Cisco 7401ASR router
interface port (1/0) that has a V.35 DTE cable attached:
Router# show controllers serial 1/0
M8T-V.35: show controller:
PAS unit 0, subunit 0, f/w version 1-19, Rev id 0x2800001, version 2
idb = 0x60942688, ds = 0x608A6570, ssb=0x608C6CF0
Clock mux=0x0, ucmd_ctrl=0x1C, port_status=0xC
maxdgram=1524, bufpool=32Kb, 64 particles
DCD=up DSR=up DTR=down RTS=down CTS=up
line state: down
cable type : V.35 DCE cable, received clockrate 123984
[display text omitted]
Following is an example of the show controllers cbus command that shows a VIP2 interface port (2/1/0)
that has a V.35 DTE cable attached:
Router# show controllers cbus
slot2: VIP2, hw 2.2, sw 21.40, ccb 5800FFA0, cmdq 480000C0, vps 8192
software loaded from flash slot0:muck/amcrae/vip2_21-40.mxt
FLASH ROM version 255.255
Mueslix Serial(8), HW Revision 0x1, FW Revision 1.20
Serial2/1/0, applique is V.35 DTE
gfreeq 48000140, lfreeq 480001B0 (1536 bytes), throttled 0
rxlo 4, rxhi 90, rxcurr 0, maxrxcurr 0
txq 48001A80, txacc 48001A82 (value 58), txlimit 58
[display text omitted]
Following is an example of the show controllers cbus command that shows a Catalyst RSM/VIP
interface port (1/0) that has a V.35 DTE cable attached:
Note The slot values displayed by some commands (such as show diag and show controllers cbus) are not
relevant to any physical connection; disregard these slot values.