|
|
This chapter explains how to install D4 channel banks and Cisco xDSL Channel Units, and contains the following procedures:
To use a D4 channel bank with Cisco 90i IDSL Channel Units, ensure that the physical T1 connections have been made to the D4 channel bank.
Step 1 The T1 interface of the D4 channel bank can be connected to the Frame Relay switch either directly (using a T1 card in the Frame Relay switch) or by using a T1 CSU/DSU connected to a synchronous serial port on the switch. The Cisco 90i IDSL Channel Unit can use either an unchannelized or a channelized T1 interface to the switch. Table 4-1 lists the required interface settings.
Step 2 Determine if the D4 channel bank is more than 1500 ft away from the Frame Relay switch T1 card or the T1 CSU/DSU. If the channel bank is more than 1500 ft from the Frame Relay switch, a T1 CSU or Network Terminator Unit should be installed to equalize the cable.
An example of the typical physical T1 connections is shown in Figure 4-1.
| Unit | Parameter | Setting |
|---|---|---|
| Channel bank | Line coding | B8ZS |
| Framing | ESF | |
| Channel counting | Sequential (SEQ) | |
| Timing source | EXT if the timing supply is connected to the channel bank-- LOCT otherwise. | |
| T1 equalizer | Set by the distance from the DSX-1 cross-connect. | |
Frame Relay Switch T1 Card or | Line coding | B8ZS |
| Framing | ESF | |
| Timing source | Loop time | |
| Timeslots | All 24 (for channelized/fractional T1) | |
| Timeslot rate | 64 kbps (for channelized/fractional T1) | |
| Frame Relay Switch | Protocol | Frame Relay UNI--2 octet DLCI |
| LMI protocol | T1.617 Annex D network (DCE) side |
To test the physical connections between the Cisco 90i IDSL Channel Unit and the Frame Relay switch, do the following:
Step 1 Temporarily insert a Cisco 90i IDSL Channel Unit in any open slot in the D4 channel bank. If you are using a standard D4 channel bank with two T1 interfaces, you must use a slot associated with the T1 interface connected in the previous section. Push the channel unit into its slot until the locking lever on the front panel of the unit engages.
Step 2 Ensure that all the LEDs on the front panel of the Cisco 90i IDSL Channel Unit blink three times and then the Backplane Status LED goes out. This indicates that the Cisco 90i Channel Unit has passed its self test.
Step 3 To test the physical connections between the Cisco 90i IDSL Channel Unit and the Frame Relay switch, wait at least 30 to 40 seconds for the Annex-D protocol to come up. Verify from the Frame Relay switch management station that the Annex-D protocol is up and error free. Leave the Cisco 90i IDSL Channel Unit in the D4 channel bank for the procedures in the following sections, "Making a Logical Connection to the Cisco 90 Series DSL Management Agent" and "Testing the Logical Connection to the SNMP Management Agent."
This section creates a permanent virtual circuit (PVC) through the Frame Relay network between the Cisco 90 Series DSL Management Agent and a newly-installed digroup. This PVC is used to manage all the channel units in the digroup. The data link connection identifier (DLCI) is used to identify the PVC that is assigned to each function. In addition, the PVC assignment also automatically assigns a bank digroup identification number that is used to address the digroup using SNMP. These numbers range from 16 to 1007.
Configure the PVC with the following DLCIs at each end:
The D4 channel bank digroup number is automatically configured by the PVC connection. For example, a digroup with DLCI 99 will be referenced on the SNMP agent by the channel bank index 99. If both digroups of the D4 channel bank are used for Cisco 90i service, a management PVC must be set up for each digroup. It may be useful to number the two digroups of the same channel bank using consecutive numbers, with the A digroup having an even number (such as 16) and the B digroup having the next higher odd number (17).
Figure 4-2 on the next page illustrates an example of four digroups located in two D4 channel banks connected to a main and backup Cisco 90 Series DSL Management Agent.
Each virtual circuit should have a Committed Information Rate (CIR) of 4 kbps and be set to the highest priority allowed. This will ensure that management traffic can get through under severe congestion conditions.
To test the logical connection to the Cisco 90 Series DSL Management Agent, perform the following steps:
Step 1 If not already installed, temporarily insert a Cisco 90i Channel Unit in the D4 bank digroup.
Step 2 Retrieve the frxBankTable and look at the frxBankIndex. This will return the DLCIs that correspond to the D4 channel banks installed. Verify that the newly-installed channel bank appears in the list. If there are 35 channel banks installed, you should have 35 DLCIs reported.
The appearance of the newly-installed channel bank in the frxBankIndex indicates the Annex D protocol is reporting to the SNMP agent that the virtual circuit to the channel bank digroup exists, and is active at the channel bank.
It may take up to 3 minutes for all the DLCIs to be reported to the SNMP agent by the Frame Relay switch, so this test must allow enough time for this to occur.
Step 3 Using the get command, display the frxChUTable and verify the channel unit you installed previously is shown. You may need to wait a few minutes for the SNMP agent to poll the bank and determine that the channel unit is there.
The D4 channel bank digroup is now installed. Note that digroups with no channel units do not show up in the Cisco 90 Series DSL Management Agent frxChUTable.
This also concludes installation of the D4 channel bank.
Step 4 If desired, the Cisco 90i Channel Unit temporarily installed in the D4 bank digroup in Step 1 may be removed. However, this will cause Annex D on the connection between the D4 channel bank and the Frame Relay switch to go down.
If you have questions or need assistance, see the section "Cisco Connection Online" in "About This Guide."
Cisco 90i IDSL Channel Units are easy to install, configure, and operate.
To install Cisco 90i IDSL Channel Units, perform the following steps:
 | Warning This equipment is intended to be grounded. Ensure that the host is connected to earth ground during normal use. |
Step 1 Insert a Cisco 90i IDSL Channel Unit in any open slot in the D4 channel bank. Push the channel unit into its slot until the locking lever on the front panel of the unit engages.
| Warning Before working on a system that has an on/off switch, turn OFF the power and unplug the power cord. |
Step 2 Ensure that all the LEDs on the front panel of the Cisco 90i IDSL Channel Unit blink three times and the Backplane Status LED goes out. This indicates that the channel unit has passed its self test.
Step 3 Press the recessed Download Config pushbutton on the channel unit faceplate to download the default configuration from the Cisco 90 Series DSL Management Agent, if present, into nonvolatile memory in the channel unit.
The default configuration can be changed through the SNMP manager.
To install subscriber loops, perform the following steps:
Connect the loop side of the channel unit to the subscriber loop as follows:
| Port A (loop 0) | T and R |
| Port B (loop 1) | T1 and R1 |
| Port C (loop 2) | E and EG |
| Port D (loop 3) | M and MB |
If the loop side is properly terminated in a BRITE card or a network terminator (NT1), the associated DSL Sync LED will go out.
Step 2 Wait a few minutes for the SNMP agent to poll the bank and determine the channel unit is there. Verify the channel unit is present in the frxChUTable.
Step 3 Set the frxPortSpeed and frxPortProtocol objects for the customer port if they are different than the default value.
Step 4 When the subscriber's equipment is connected on any of the four ports, the frxDSLStatus reports loopUp, and the frxChEsTx and frxChEsRx errored seconds counters should not be increasing.
If the port protocol is set to Frame Relay and the subscriber has properly configured Frame Relay CPE connected, the frxPortLinkErrors and frxPortProtErrors should not be increasing. If the errors are increasing, use the frxUEocTable to do loopback and BERT diagnostic tests.
See the chapter "Managing Cisco 90i IDSL Channel Units and Subscriber Loops" for detailed information on performing diagnostic tests.
Configure the permanent virtual circuits (PVCs) using the following steps:
Step 1 If the subscriber has Frame Relay customer premises equipment (CPE) and their IDSL port frxPortProtocol object is set to Frame Relay, you can assign up to eight PVCs with DLCIs in the range 16 to 23. This is called the subscriber DLCI. If the subscriber is running Point-to-Point Protocol (PPP) (frxPortProtocol object is set to PPP), the subscriber DLCI is 16.
These subscriber DLCIs are then converted to network DLCIs by the Cisco 90i IDSL Channel Unit, which automatically maps the subscriber DLCI to the network DLCI. No configuration is necessary.
Network DLCIs can be derived mathematically using the following equation:
Refer to the appendix "DLCI Assignments," for a table listing the DLCI assignment mapping.
Step 2 When the network DLCI is determined, the PVC should be provisioned in the Frame Relay switch using the network DLCI on the Cisco 90i end of the circuit.
Step 3 When the network PVC is provisioned, verify the corresponding PVC is present in the subscriber circuit. It will be in the DLCI range (16 to 23) corresponding to the network DLCI mapping.
This is done by retrieving the frxCircuitTable for the appropriate bank, channel unit, and port, and observing which values of frxPvcIndex are populated. It may take a minute for the Annex D protocol to transfer this information from the Frame Relay switch to the Cisco 90i Channel Unit.
Step 4 Set the frxCktCIR, frxCktBc, and frxCktBe for each PVC if it is different from the default value.
Step 5 If the Frame Relay equipment at the far end of the PVC has been installed, verify the frxFarEndOpStat for the circuit is active.
|
|