Cisco Systems® extends WAN connectivity by adding high-speed ATM access to remote branch offices with the Cisco® 3800 ATM OC-3 Network Module.
OVERVIEW
A 155-Mbps ATM OC-3 network module is available on the Cisco 3825 and 3845 integrated services routers, starting with Cisco IOS® Software Release 12.4(3) Mainline (Figure 1). The network module supports the ATM forum standard ATM Adaptation Layer 5 (AAL5) with the following ATM quality of service (QoS) traffic classes: unspecified bit rate (UBR), UBR+, real-time variable bit rate (VBR-rt), non-real-time VBR (VBR-nrt), available bit rate (ABR), and constant bit rate (CBR). Voice over IP (VoIP) and H.323 over ATM is supported over the WAN using the currently available onboard voice digital signal processors (DSPs), analog voice and fax network modules, and voice interface cards.
The network module has modular optics supporting the Cisco pluggable optical modules (POMs) and Cisco Small Form-Factor Pluggables (SFPs), simplifying the selection of network modules from six offerings to one. The SFPs support STM-1 framing standards over multimode, single-mode intermediate-reach, and single-mode long-reach fiber-optic interfaces. The module is a single-port module with LC-type connector. The single-mode SFPs combined with the ATM network module provide high-speed trunking for users with access to a fiber WAN, whereas multimode is ideal for connecting high-speed servers, switches, or hubs equipped with OC-3/STM-1 fiber connections.
Cisco IOS SP Services feature sets are required to support ATM. A maximum of one ATM OC-3 network module is recommended on the Cisco 3825, and a maximum of two ATM OC-3 network modules are recommended on the Cisco 3845.
Figure 1. Cisco 3800 Series ATM OC-3 Network Module
PRODUCT SUMMARY
The Network module supports three different SFPs, each with a different physical interface, support OC-3c/STM-1 multimode, OC-3c/STM-1 single-mode intermediate-reach, and OC-3c/STM-1 single-mode long-reach modes, however the module supports ATM OC-3 only. Table 1 lists the SFPs supported on the new network module.
Table 1. ATM OC-3 Network Module and Supported POMs and SFPs
• ATM service classes: UBR, UBR+, VBR-rt, VBR-nrt, ABR, and CBR (data only)
• Permanent virtual paths (PVPs)
• ATM bandwidth (resource) manager
• Multiprotocol over ATM (MPOA) client and server
• Multiprotocol Label Switching (MPLS)
• IETF Point-to-Point Protocol (PPP) over ATM
• Next Hop Resolution Protocol (NHRP)
• F4 and F5 operations and management (operation, administration, and maintenance [OAM]) cell support
• Interim Local Management Interface (ILMI)
SYSTEM REQUIREMENTS
• The new network module is supported on the Cisco 3825 and the Cisco 3845.
• SP Services feature sets of Cisco IOS Software Release 12.4(3) Mainline or above and 12.4(4)T or above are required.
• A maximum of one ATM OC-3 network module is supported on the Cisco 3825; the maximum for the Cisco 3845 is two.
• The system requires no additional flash or DRAM memory other than the Cisco IOS Software Release 12.4(3) Mainline and 12.4(4)T feature set specified minimum memory requirements.
• No slot dependent.
Table 2 gives support and orderability information for Cisco IOS Software.
Table 2. Cisco IOS Software Support and Orderability Rules
Product
Cisco IOS Software Version Required
Cisco IOS Feature Sets Required
Minimum DRAM Memory
Maximum Supported
Cisco 2600 Series, Including Cisco 2610, 2611, 2620, 2621, 2650, 2651, and 2691 Multiservice Platforms and Cisco 2610XM, 2611XM, 2620XM, 2621XM, 2650XM, and 2651XM Multiservice Routers
Not supported
-
-
-
Cisco 2800 Series, Including Cisco 2801, 2811, 2821, and 2851
Not supported
-
-
-
Cisco 3600 Series, Including Cisco 3620, 3640, and 3660 Multiservice Platforms
Not supported
-
-
-
Cisco 3700 Series, Including Cisco 3725 and 3745 Multiservice Access Routers
Not supported
-
-
-
Cisco 3825 Integrated Services Router
12.4(3) Mainline and 12.4(4)T
SP Services
Same as 12.4(3) Mainline and 12.4(4)T Cisco IOS SP Services feature sets DRAM minimum memory requirements.
1
Cisco 3845 Integrated Services Router
12.4(3) Mainline and 12.4(4)T
SP Services
Same as 12.4(3) Mainline and 12.4(4)T Cisco IOS SP Services feature sets DRAM minimum memory requirements.
2
Note: OC-3 ATM network modules are not supported in IP Base, IP Voice, Enterprise Base, and Advanced Security Feature Sets. ATM is supported in Advanced Services, Enterprise Services, and Advanced Enterprise Services feature sets.
Table 3 gives ATM service category definitions, and Table 4 lists their attributes and guarantees.
Table 3. ATM Service Category Definitions
ATM Service Categories
Typical Use
UBR
Best-effort service intended for non-real-time bursty applications that do not require a guarantee of traffic characteristics such as bandwidth, cell delay, and cell delay variation.
UBR+
Provides a guaranteed frame rate (GFR) service with single leaky bucket algorithm; provides the ability to reserve UBR bandwidth minimum, or specify bandwidth maximum; similar to VBR in that it increases the minimum cell rate (MCR) when cell rate falls below the MCR.
VBR-rt and VBR-nrt
Intended for applications that have bursty traffic patterns but require a guarantee of some traffic parameters; a peak cell rate (PCR), sustained cell rate (SCR), and maximum burst size (MBS) can specify traffic parameters.
ABR
Employed to maximize bandwidth use of the ATM link by using congestion feedback notification (resource management cells); both PCR and MCR specify the ABR connection; the transmit rate of each connection is flow-controlled such that the rate is always between the user-specified values for a minimum and peak rate.
CBR
Intended for real-time applications such as Systems Network Architecture (SNA) traffic, voice, and video, which require a fixed bandwidth and low cell delay; CBR in initial release supports data only.
Table 4. ATM Service Category Attributes and Guarantees
Service Category
Traffic Description
Minimum Loss Cell Loss Ratio (CLR)
Delay Variance
Bandwidth
Use of Feedback Control
UBR
PCR
No
No
No
No
UBR+
PCR
Yes
No
No
No
VBR-rt
PCR, SCR, and MBS
Yes
Yes
Yes
No
VBR-nrt
PCR, SCR, and MBS
Yes
No
Yes
No
ABR
PCR, MCR+, and behavior parameters
Yes
No
Yes
Yes
CBR
PCR
Yes
Yes
Yes
No
Table 5 lists the ATM OC-3 LED's with their functions and color.
Table 5. ATM OC-3 Network Modules LED Description
ATM OC-3 LEDs
Function
Color
ENABLED
This LED indicates the ATM OC-3 network module has passed self-tests and is available to the router.
Green
RX CR
This LED indicates that a carrier signal is present.
Green
RX CL
This LED indicates that a cell was received.
Green
TX CL
This LED indicates that a cell was transmitted.
Green
RX ALM
This LED is an alarm indication signal.
Yellow
OC-3 ATM PHYSICAL SPECIFICATIONS
Table 6 gives specifications for the Cisco 3800 Series ATM OC-3 Network Module.
Table 6. Product Specifications
Feature
Description
Dimensions (H x W x D)
1.6 x 7.10 x 7.2 in. (4.1 x 18.0 x 18.2 cm)
Weight
2 lb maximum (1 kg maximum)
Environmental Conditions
Operating temperature: 32 to 104°F (0 to 40°C)
Nonoperating temperature: -13 to 158°F (-25 to 70°C)
Relative Humidity
5 to 95%
Protocols Supported
All in Cisco IOS Software Release 12.4(3)
Cabling
LC-type connector
Network Interfaces
Compatible with all existing network modules and WICS supported by Cisco 2600/2691/3600/3700/3800 routers
