Subscriber Addressing

Subcriber IDs are the called and calling addresses that are placed in call packets. Each Subscriber ID record also defines routing for calls to the subscriber. Each subscriber ID, or address, consists of up to 15 digits, including (if desired) question marks and/ or asterisks used as wildcards. (See "Wildcards in Subscriber Addresses.")

Subscribers using a public data network (PDN) must conform to the format used by the PDN. For example, CCITT Recommendation X.121 specifies this format: a one- digit international code, followed by a four-digit Data Network Identification Code (DNIC), followed by up to 10 digits of Network Terminal Number (NTN).

A private network (that will not communicate with other networks) does not need to follow the format—any or all of the digits can be used as desired, following the guide- lines in this chapter.

Wildcards in Subscriber Addresses

Each subscriber is assigned to a SmartSwitch 1800 port, and more than one subscriber device can use a port. To eliminate the need to specify the complete ID of every sub- scriber on the port, the question mark and the asterisk can be used as “wildcard” char- acters.

A question mark in an address matches any single digit. For example, 3110?????????? is any 14-digit address that begins with 3110.

An asterisk matches any combination of digits, including none at all. For example, 3110*00 is any address that starts with 3110 and ends with 00, including 311000 (but not 31100—overlapping is not allowed). Note that * by itself is very important, because it matches any address.

Wildcards can be combined. The address 3110??* is any address beginning with 3110 and containing at least two more digits.

The following figure shows an example of wildcard addressing.

Node 1	P1	00100
Node 1		00100
P3 - Subscriber ID 123*
L1,P0		12301
L1,P0	L0,P0
	L0,P0
	L0,P1	12302
Node 2	L0,P2
Node 2	L0,P3	12303
	L0,P3	12303
		12304

Figure 8-7 Wildcard Addressing Example

Configuring X.25

8-21

1800 specifications

Cabletron Systems, a leading player in network management and telecommunications solutions during the late 20th century, introduced several innovative products that played a crucial role in shaping enterprise networking. Among these were the Cabletron FRX6000, FRX4000, and the FRX1800, which delivered advanced features aimed at enhancing network performance, security, and scalability.

The Cabletron FRX6000 was designed as a robust multi-layer switch, ideal for large-scale enterprise environments. It supported extensive routing capabilities, allowing organizations to manage traffic efficiently even under heavy loads. The FRX6000 boasted high throughput rates and low latency, making it suitable for demanding applications. With support for various network protocols, including IP, IPX, and AppleTalk, its adaptability made it a versatile choice for diverse networking needs. Moreover, security features like VLAN support and Access Control Lists (ACLs) provided enhanced protection against potential threats.

Moving to the FRX4000, this model offered a balance between performance and cost-effectiveness. The FRX4000 maintained many of the essential features of its larger counterpart while catering to medium-sized enterprises. It provided Layer 3 routing and could handle multiple simultaneous connections, ensuring seamless communication across departments. The modular design allowed for easy upgrades, enabling businesses to expand their network infrastructure without significant overhauls. This made the FRX4000 an attractive option for organizations looking to optimize their network investments.

Lastly, the FRX1800, designed for small to medium businesses, focused on simplicity and ease of use while still incorporating powerful network management capabilities. Its user-friendly interface made it accessible for organizations lacking extensive IT resources. The FRX1800 provided essential functionalities such as Integrated Layer 2 switching and routing, network monitoring, and basic security features, ensuring that even smaller companies could maintain efficient, reliable networking without overwhelming complexity.

All three models utilized advanced technologies, including a high bandwidth backbone and state-of-the-art switching architecture, to enable fast and reliable data transfer. They also supported Quality of Service (QoS) mechanisms, allowing businesses to prioritize critical applications and ensure consistent performance across the network.

In summary, the Cabletron FRX6000, FRX4000, and FRX1800 were pivotal in enhancing network capabilities, providing organizations with scalable, secure, and high-performance options tailored to their specific needs.

Cabletron Systems 1800 manual Subscriber Addressing, Wildcards in Subscriber Addresses

Models: 1800