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Cisco Routers
HUB/NODE Switch
LAN/WAN Port Table
Front Panel LED Functions
Routing with Cisco 700 Series for LAN-ISDN Service
What You Need
The Cisco 761, 762, 765, 766, 771, 772, 775 and 776 routers work with our LAN-ISDN service, although they are NOT certified. These 700 series routers come with two serial ports and one console port. The table below lists the LAN interfaces for each router.
Cisco 700 series routers provide one basic rate interface (BRI). You will need to contact a local telephone service provider to provision an ISDN connection. The ISDN BRI service provided by your telephone service provider offers two bearer channels (B channels) and one data channel (D channel).
In order to use a Cisco 700 series router with our LAN-ISDN service, you will need an external NT1. Inside North America, if you have a 761, 765, 771, or 775, you must provide an external NT1 and the ISDN U cable that connects the NT1 to the ISDN wall jack. Contact your telephone service provider for a list of NT1 vendors. If you have a 762, 766, 772, or 776, you can use the internal NT1 in the router.
HUB/NODE Switch
The Ethernet ports on hubs are wired differently than the Ethernet ports on nodes. This allows the devices to communicate with a straight-through Ethernet cable. Basically, transmitted data must be sent from the transmit pin on one device to the receive pin on the other device, and vice versa. Nodes connected to hubs handle this crossover internally. If the signal does not cross over, the transmitted data is sent from the transmit pin on the sending device to the transmit pin on the receiving device, and communications fails.
To connect two nodes or two hubs, the signal must be crossed externally. Usually this is
accomplished using an Ethernet crossover cable. The pins of a crossover cable have been
rewired so the transmit pins are connected to the receive pins, as shown in the diagram below:
NOTE: Your Cisco 761, Cisco 762, Cisco 765, Cisco 771, Cisco 772, or Cisco 775 router can be either a hub or a node. The HUB/NODE switch eliminates the need for a crossover cable. When the switch is in NODE position, the router is seen as a node and connects to a hub with a straight Ethernet cable. When the switch is in HUB position, the router can connect to a network interface card (NIC) installed in a PC.
Cisco 766 and Cisco 776 routers have an unmanaged 4-port Ethernet hub. If you are
connecting a Cisco 766 or Cisco 776 router to another Ethernet hub, you must use a
crossover cable.
LAN/WAN Port Table
| Model |
Ethernet Interfaces |
Other Interfaces |
| Cisco 761 |
1 Ethernet |
1 ISDN BRI S/T |
| Cisco 762 |
1 Ethernet |
1 ISDN BRI S/T and 1 ISDN BRI U |
| Cisco 765 |
1 Ethernet |
1 ISDN BRI S/T and 2 analog telephone |
| Cisco 766 |
1 Ethernet |
1 ISDN BRI S/T, 1 ISDN BRI U and 2 analog telephone jacks |
| Cisco 771 |
4-port unmanaged Ethernet hub |
1 ISDN BRI S/T |
| Cisco 772 |
4-port unmanaged Ethernet hub |
1 ISDN BRI S/T and 1 ISDN BRI U |
| Cisco 775 |
4-port unmanaged Ethernet hub |
1 ISDN BRI S/T and 2 analog telephone jacks |
| Cisco 776 |
4-port unmanaged Ethernet hub |
1 ISDN BRI S/T, 1 ISDN BRI U, and 2 analog telephone jacks |
Front Panel LED Functions
LED |
Function |
RD (Cisco 760 series)
RDY (Cisco 770 series) |
Indicates the router operating status. On when power is supplied to the router, the router passes the self-test, and is operating normally. |
| NT1 (Cisco 762, Cisco 766, Cisco 772, and Cisco 776 only) |
- On when the internal NT1 and the ISDN switch are synchronized.
- Blinking (5 blinks per second) indicates that the internal NT1 is attempting to synchronize with the telephone switch.
- Blinking (1 blink per second) indicates that the internal NT1 is attempting to synchronize with the ISDN terminal devices.
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| LINE |
On when the NT1 S interface and the ISDN terminal device(s) are synchronized. Also indicates framing between the router and the ISDN switch. |
| LAN |
On when packets have been sent to or received from the Ethernet within the last minute. |
| RXD |
Blinks when packets are received from the LAN. |
| TXD |
Blinks when packets are sent to the LAN. |
| LK1 (Cisco 770 only) |
On when the first LAN link of the unmanaged hub is connected. Blinks (once every 1.5 seconds) when there is a problem with the connection. |
| LK2 (Cisco 770 only) |
On when there is a connection on the second LAN link of the unmanaged hub is connected. Blinks (once every 1.5 seconds) when there is a problem with the connection. |
| LK3 (Cisco 770 only) |
On when there is a connection on the third LAN link of the unmanaged hub is connected. Blinks (once every 1.5 seconds) when there is a problem with the connection. |
| LK4 (Cisco 770 only) |
On when there is a connection on the fourth LAN link of the unmanaged hub is connected. Blinks (once every 1.5 seconds) when there is a problem with the connection. |
| CH1 |
Blinks when a call is establishing a connection on the first B channel. On when a call is established or the connection has not yet timed out. |
| CH1 RXD |
Blinks when packets are received on the first B channel. |
| CH1 TXD |
Blinks when packets are sent on the first B channel. |
| CH2 |
Blinks when a call is establishing a connection on the second B channel. On when a call is established or the connection has not yet timed out. |
| CH2 RXD |
Blinks when packets are received on the second B channel. |
| CH2 TXD |
Blinks when packets are sent on the second B channel. |
PH 1
PH 2
(Cisco 765, Cisco 766, Cisco 775, and Cisco 776 only) |
- Blinks when the corresponding basic telephone service line is off-hook.
- Blinks in the following patterns when entering DTMF commands for the corresponding basic telephone service port on the router:
- Blinks twice every second for 2 seconds if the command is entered correctly.
- Blinks once every second for 4 seconds if the command is entered incorrectly.
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